[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"layout-global":3,"blog-detail-sn74ls47n-pinout-truth-table":84,"blog-related-articles-sn74ls47n-pinout-truth-table":112,"blog-categories-sidebar":202,"article-related-products-sn74ls47n-pinout-truth-table":232},{"msg":4,"code":5,"data":6},"操作成功",200,{"navTop":7,"footer":36},[8,18,24,30],{"id":9,"parentId":10,"title":11,"name":11,"label":11,"type":12,"url":13,"target":14,"icon":15,"sort":16,"children":17},6,0,"Electronic Components","LINK","\u002Felectronic-components","_self",null,10,[],{"id":19,"parentId":10,"title":20,"name":20,"label":20,"type":12,"url":21,"target":14,"icon":15,"sort":22,"children":23},7,"Manufacturers","\u002Fmanufacturers",20,[],{"id":25,"parentId":10,"title":26,"name":26,"label":26,"type":12,"url":27,"target":14,"icon":15,"sort":28,"children":29},8,"Request Quote","\u002Frequest-quote",30,[],{"id":31,"parentId":10,"title":32,"name":32,"label":32,"type":12,"url":33,"target":14,"icon":15,"sort":34,"children":35},9,"Tutorials","\u002Fresource",40,[],{"groups":37,"logoUrl":15,"socialLinks":15,"contactPhone":15,"contactEmail":80,"address":81,"description":82,"copyright":83},[38,54,65],{"id":39,"title":40,"sort":10,"links":41},2,"Products",[42,44,46,50],{"id":16,"label":43,"href":13,"target":14,"icon":15,"sort":16},"All Products",{"id":45,"label":20,"href":21,"target":14,"icon":15,"sort":22},11,{"id":47,"label":48,"href":49,"target":14,"icon":15,"sort":28},12,"Applications","\u002Fapplications",{"id":51,"label":52,"href":53,"target":14,"icon":15,"sort":34},19,"Series","\u002Fseries",{"id":55,"title":56,"sort":22,"links":57},3,"Services",[58,61],{"id":59,"label":60,"href":27,"target":14,"icon":15,"sort":16},13,"Submit Your Bom",{"id":62,"label":63,"href":64,"target":14,"icon":15,"sort":22},21,"Frequently Asked Questions","\u002Ffaq",{"id":66,"title":67,"sort":28,"links":68},4,"Company",[69,73,76],{"id":70,"label":71,"href":72,"target":14,"icon":15,"sort":16},16,"About Us","\u002Fabout-us",{"id":74,"label":75,"href":33,"target":14,"icon":15,"sort":22},17,"Blog",{"id":77,"label":78,"href":79,"target":14,"icon":15,"sort":28},18,"Contact Octatronics","\u002Fcontact-us","support@octatronics.com","RM502C, 5\u002FF, HO KING COMM CTR, 2-16 FAYUEN ST, MONGKOK KOWLOON, HONG KONG","Octatronics is a trusted sourcing platform for semiconductors and electronic components.","@2026 Octatronics. All rights reserved.",{"id":85,"title":86,"slug":87,"summary":88,"content":89,"coverImage":90,"category":15,"tags":15,"author":91,"viewCount":9,"isPublished":92,"isTop":93,"seoTitle":94,"seoDesc":88,"seoKeywords":15,"faqJson":15,"publishTime":95,"categoryId":39,"authorId":55,"articleCategory":96,"articleAuthor":99,"delFlag":93,"createBy":105,"createTime":106,"updateBy":105,"updateTime":107,"productCategoryIds":108,"manufacturerIds":109,"applicationIds":111},45,"SN74LS47N Pinout, Truth Table, Circuit and 7-Segment Display Guide","sn74ls47n-pinout-truth-table","Learn the SN74LS47N pinout, truth table, working principle, 7-segment wiring, common-anode circuit, LT\u002FRBI\u002FBI functions, Arduino use, and troubleshooting.","\u003Cp>The \u003Cstrong>SN74LS47N\u003C\u002Fstrong> is a BCD-to-seven-segment decoder\u002Fdriver designed to convert a 4-bit binary-coded decimal input into the seven control signals required by a numeric display.\u003C\u002Fp>\u003Cp>It is particularly useful when a circuit needs to display decimal numbers from 0 to 9 without requiring a microcontroller to control every LED segment individually.\u003C\u002Fp>\u003Cp>Unlike a simple logic decoder, the SN74LS47N includes several display-oriented functions, including \u003Cstrong>lamp testing, display blanking, and leading- or trailing-zero suppression\u003C\u002Fstrong>.\u003C\u002Fp>\u003Cp>It also uses \u003Cstrong>active-low, open-collector segment outputs\u003C\u002Fstrong>, making it particularly suitable for \u003Cstrong>common-anode seven-segment displays\u003C\u002Fstrong>.\u003C\u002Fp>\u003Cp>This guide explains the SN74LS47N pinout, truth table, operating principle, 7-segment wiring, control pins, Arduino interface, logic-level compatibility, component alternatives, and common troubleshooting issues.\u003C\u002Fp>\u003Cp>\u003Cstrong>Quick Answer:\u003C\u002Fstrong> The SN74LS47N is a 16-pin BCD-to-seven-segment decoder\u002Fdriver that converts four BCD inputs into seven active-low, open-collector outputs for driving a common-anode seven-segment display. Its BCD inputs are A on pin 7, B on pin 1, C on pin 2, and D on pin 6. It also provides lamp testing, display blanking, and ripple blanking for multi-digit zero suppression.\u003C\u002Fp>\u003Ch2>What Is the SN74LS47N?\u003C\u002Fh2>\u003Cp>The \u003Ca href=\\\"https:\u002F\u002Foctatronics.com\u002Fcomponents\u002Ftexas-instruments-sn74ls47n\\\" rel=\\\"noopener noreferrer\\\" target=\\\"_blank\\\"> SN74LS47N \u003C\u002Fa> is a member of Texas Instruments' 74LS TTL logic family. Like other \u003Ca href=\\\"https:\u002F\u002Foctatronics.com\u002Fresource\u002Ftechnical-knowledge\u002Fsemiconductor-basics-device-physics-system-design\\\" rel=\\\"noopener noreferrer\\\" target=\\\"_blank\\\"> semiconductor devices used in digital logic circuits \u003C\u002Fa>, its behavior depends on defined input thresholds, supply conditions, output architecture, and load characteristics.\u003C\u002Fp>\u003Cp>Its basic function is:\u003C\u002Fp>\u003Cblockquote>\u003Cstrong>4-bit BCD input → seven-segment decoding → display driver outputs\u003C\u002Fstrong>\u003C\u002Fblockquote>\u003Cp>A decimal digit can be represented using four binary signals:\u003C\u002Fp>Decimal 0 = 0000Decimal 1 = 0001Decimal 2 = 0010Decimal 3 = 0011...Decimal 9 = 1001\u003Cp>The SN74LS47N receives these four inputs and determines which sections of a seven-segment display should illuminate.\u003C\u002Fp>\u003Cp>For example:\u003C\u002Fp>BCD Input0 1 0 1↓SN74LS47N↓Segments required for decimal 5\u003Cp>Instead of a controller having to calculate and drive seven segment signals individually, it only needs to provide the appropriate four-bit BCD value.\u003C\u002Fp>\u003Ch3>Key SN74LS47N Features\u003C\u002Fh3>\u003Col>\u003Cli>BCD-to-seven-segment decoding\u003C\u002Fli>\u003Cli>Four BCD inputs: A, B, C, and D\u003C\u002Fli>\u003Cli>Seven display outputs: a through g\u003C\u002Fli>\u003Cli>Active-low segment outputs\u003C\u002Fli>\u003Cli>Open-collector output architecture\u003C\u002Fli>\u003Cli>Designed primarily for common-anode displays\u003C\u002Fli>\u003Cli>Lamp-test input\u003C\u002Fli>\u003Cli>Blanking input\u003C\u002Fli>\u003Cli>Ripple blanking for zero suppression\u003C\u002Fli>\u003Cli>16-pin PDIP package for SN74LS47N\u003C\u002Fli>\u003C\u002Fol>\u003Ch2>SN74LS47 vs SN74LS47N: What Does the N Mean?\u003C\u002Fh2>\u003Cp>The terms \u003Cstrong>74LS47\u003C\u002Fstrong>, \u003Cstrong>SN74LS47\u003C\u002Fstrong>, and \u003Cstrong>SN74LS47N\u003C\u002Fstrong> are often used interchangeably online, but they do not describe exactly the same thing.\u003C\u002Fp>\u003Cp>\u003Cstrong>SN74LS47\u003C\u002Fstrong> refers to the device family, while \u003Cstrong>SN74LS47N\u003C\u002Fstrong> identifies a particular package version.\u003C\u002Fp>\u003Cblockquote>\u003Cstrong>N = 16-pin PDIP package\u003C\u002Fstrong>\u003C\u002Fblockquote>\u003Cp>This distinction matters when designing a PCB, repairing older equipment, or ordering a replacement component. The electrical function may be similar across package variants, but the physical package and PCB footprint are not necessarily interchangeable.\u003C\u002Fp>\u003Cp>Package suffixes should also not be confused with the abbreviated markings printed on an IC body. If you are identifying an unknown or partially marked device, see our \u003Ca href=\\\"https:\u002F\u002Foctatronics.com\u002Fresource\u002Ftechnical-knowledge\u002Fic-top-marking-codes-smd-chip-identification\\\" rel=\\\"noopener noreferrer\\\" target=\\\"_blank\\\"> IC top marking codes guide \u003C\u002Fa> for a practical process for checking manufacturer markings, package type, pin count, and datasheet information.\u003C\u002Fp>\u003Ch2>SN74LS47N Pinout\u003C\u002Fh2>\u003Cp>The SN74LS47N uses a 16-pin package. One of the most common mistakes when working with this IC is assuming that BCD inputs A, B, C, and D correspond sequentially to pins 1, 2, 3, and 4.\u003C\u002Fp>\u003Cp>\u003Cimg src=\\\"\u002Fprod-api\u002Fprofile\u002Fupload\u002Fblog\u002Ftechnical-knowledge\u002Fsn74ls47n-pinout-truth-table.webp\\\" \u002F>\u003C\u002Fp>\u003Cp>\u003Cstrong>They do not.\u003C\u002Fstrong>\u003C\u002Fp>\u003Ctable>\u003Ctbody>\u003Ctr>\u003Ctd>Pin\u003C\u002Ftd>\u003Ctd>Name\u003C\u002Ftd>\u003Ctd>Function\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>B\u003C\u002Ftd>\u003Ctd>BCD input, binary weight 2\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>2\u003C\u002Ftd>\u003Ctd>C\u003C\u002Ftd>\u003Ctd>BCD input, binary weight 4\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>3\u003C\u002Ftd>\u003Ctd>LT\u003C\u002Ftd>\u003Ctd>Lamp Test input\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>4\u003C\u002Ftd>\u003Ctd>BI\u002FRBO\u003C\u002Ftd>\u003Ctd>Blanking Input \u002F Ripple Blanking Output\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>5\u003C\u002Ftd>\u003Ctd>RBI\u003C\u002Ftd>\u003Ctd>Ripple Blanking Input\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>6\u003C\u002Ftd>\u003Ctd>D\u003C\u002Ftd>\u003Ctd>BCD input, binary weight 8\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>7\u003C\u002Ftd>\u003Ctd>A\u003C\u002Ftd>\u003Ctd>BCD input, binary weight 1\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>8\u003C\u002Ftd>\u003Ctd>GND\u003C\u002Ftd>\u003Ctd>Ground\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>9\u003C\u002Ftd>\u003Ctd>e\u003C\u002Ftd>\u003Ctd>Segment e output\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>10\u003C\u002Ftd>\u003Ctd>d\u003C\u002Ftd>\u003Ctd>Segment d output\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>11\u003C\u002Ftd>\u003Ctd>c\u003C\u002Ftd>\u003Ctd>Segment c output\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>12\u003C\u002Ftd>\u003Ctd>b\u003C\u002Ftd>\u003Ctd>Segment b output\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>13\u003C\u002Ftd>\u003Ctd>a\u003C\u002Ftd>\u003Ctd>Segment a output\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>14\u003C\u002Ftd>\u003Ctd>g\u003C\u002Ftd>\u003Ctd>Segment g output\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>15\u003C\u002Ftd>\u003Ctd>f\u003C\u002Ftd>\u003Ctd>Segment f output\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>16\u003C\u002Ftd>\u003Ctd>VCC\u003C\u002Ftd>\u003Ctd>Positive supply\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Ch3>SN74LS47N Pin Functions\u003C\u002Fh3>\u003Cp>The four BCD inputs represent different binary weights:\u003C\u002Fp>A = Pin 7 = Weight 1B = Pin 1 = Weight 2C = Pin 2 = Weight 4D = Pin 6 = Weight 8\u003Cp>The decimal value represented by these inputs can therefore be calculated as:\u003C\u002Fp>Decimal value = 8D + 4C + 2B + A\u003Ch3>Understanding the A, B, C and D Inputs\u003C\u002Fh3>\u003Cp>For decimal 5:\u003C\u002Fp>D C B A0 1 0 1\u003Cbr \u002F>= 4 + 1= 5\u003Cp>This input ordering is especially important when troubleshooting a circuit that displays the wrong number.\u003C\u002Fp>\u003Cp>When identifying an SN74LS47N or another logic IC on an existing PCB, also verify the package orientation, pin-1 indicator, printed markings, and surrounding circuit. Our \u003Ca href=\\\"https:\u002F\u002Foctatronics.com\u002Fresource\u002Ftechnical-knowledge\u002Fcircuit-board-component-identification-guide\\\" rel=\\\"noopener noreferrer\\\" target=\\\"_blank\\\"> circuit board component identification guide \u003C\u002Fa> explains how to identify ICs and other PCB components using reference designators, physical packages, markings, and circuit context.\u003C\u002Fp>\u003Ch2>How Does the SN74LS47N Work?\u003C\u002Fh2>\u003Cp>Internally, the SN74LS47N performs combinational logic decoding. The four BCD inputs represent one decimal digit, and the IC converts that value into seven segment-control outputs.\u003C\u002Fp>D C B A│▼┌──────────────┐│ SN74LS47N ││ BCD Decoder │└──────────────┘│a b c d e f g│▼7-Segment Display\u003Ch3>How a Seven-Segment Display Represents Numbers\u003C\u002Fh3>\u003Cp>A standard seven-segment display contains seven LED sections identified as a through g:\u003C\u002Fp>─ a ─| |f b| |─ g ─| |e c| |─ d ─\u003Cp>Different combinations of these segments create different decimal digits.\u003C\u002Fp>\u003Cp>For decimal \u003Cstrong>1\u003C\u002Fstrong>, segments \u003Cstrong>b\u003C\u002Fstrong> and \u003Cstrong>c\u003C\u002Fstrong> are illuminated.\u003C\u002Fp>\u003Cp>For decimal \u003Cstrong>7\u003C\u002Fstrong>, segments \u003Cstrong>a\u003C\u002Fstrong>, \u003Cstrong>b\u003C\u002Fstrong>, and \u003Cstrong>c\u003C\u002Fstrong> are illuminated.\u003C\u002Fp>\u003Cp>For decimal \u003Cstrong>8\u003C\u002Fstrong>, all seven segments are illuminated.\u003C\u002Fp>\u003Cp>The SN74LS47N automatically generates the required segment pattern from the four BCD input signals.\u003C\u002Fp>\u003Ch3>Active-Low and Open-Collector Outputs Explained\u003C\u002Fh3>\u003Cp>The segment outputs of the SN74LS47 are \u003Cstrong>active low\u003C\u002Fstrong> and \u003Cstrong>open collector\u003C\u002Fstrong>.\u003C\u002Fp>\u003Cp>This means the output logic may appear reversed compared with ordinary push-pull digital outputs.\u003C\u002Fp>SN74LS47 segment output:\u003Cbr \u002F>LOW = Segment ONInactive\u002Fopen-collector state = Segment OFF\u003Cp>Rather than sourcing current into the LED segment, the SN74LS47 primarily provides a path for current to flow toward ground.\u003C\u002Fp>\u003Ch2>SN74LS47N Truth Table\u003C\u002Fh2>\u003Cp>For normal decimal operation, BCD values range from 0000 through 1001.\u003C\u002Fp>\u003Ctable>\u003Ctbody>\u003Ctr>\u003Ctd>Decimal\u003C\u002Ftd>\u003Ctd>D\u003C\u002Ftd>\u003Ctd>C\u003C\u002Ftd>\u003Ctd>B\u003C\u002Ftd>\u003Ctd>A\u003C\u002Ftd>\u003Ctd>Display\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>2\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>2\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>3\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>3\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>4\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>4\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>5\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>5\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>6\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>6\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>7\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>7\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>8\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>8\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>9\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>0\u003C\u002Ftd>\u003Ctd>1\u003C\u002Ftd>\u003Ctd>9\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Ch3>What Happens With BCD Inputs 10–15?\u003C\u002Fh3>\u003Cp>Four input bits can represent sixteen binary combinations, but BCD uses only ten of them for decimal digits.\u003C\u002Fp>Valid decimal BCD:0000 through 1001\u003Cbr \u002F>Outside normal decimal BCD:1010 through 1111\u003Cp>Values from 1010 through 1111 therefore do not represent valid decimal digits 0 through 9.\u003C\u002Fp>\u003Cp>The SN74LS47 may generate recognizable non-decimal segment patterns for these input combinations rather than simply displaying a normal digit. This can be useful when debugging counters or digital-logic circuits that accidentally produce invalid BCD values.\u003C\u002Fp>\u003Ch2>Why Does the SN74LS47 Use a Common-Anode Display?\u003C\u002Fh2>\u003Cp>Because the SN74LS47 uses active-low, open-collector segment outputs, it is normally paired with a \u003Cstrong>common-anode seven-segment display\u003C\u002Fstrong>.\u003C\u002Fp>\u003Cp>In a common-anode display, the positive side of the LED segments shares a common connection.\u003C\u002Fp>+5 V│Common Anode│LED Segment│Current-Limiting Resistor│SN74LS47 Output│GND\u003Cp>When the relevant SN74LS47 output is pulled low, current can flow through the LED segment and the segment illuminates.\u003C\u002Fp>\u003Cp>This current-sinking behavior is one of the most important concepts to understand when designing or troubleshooting a 74LS47 display circuit.\u003C\u002Fp>\u003Ch2>SN74LS47N Circuit With a 7-Segment Display\u003C\u002Fh2>\u003Cp>A basic SN74LS47N circuit consists of a BCD signal source, the decoder\u002Fdriver, seven current-limiting resistor paths, and a common-anode seven-segment display.\u003C\u002Fp>BCD Source│▼SN74LS47N│a b c d e f g│Current-Limiting Resistors│Common-Anode7-Segment Display\u003Ctable>\u003Ctbody>\u003Ctr>\u003Ctd>SN74LS47N Pin\u003C\u002Ftd>\u003Ctd>Connect To\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Pin 16 — VCC\u003C\u002Ftd>\u003Ctd>Positive supply\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Pin 8 — GND\u003C\u002Ftd>\u003Ctd>Ground\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Pin 7 — A\u003C\u002Ftd>\u003Ctd>BCD bit 0\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Pin 1 — B\u003C\u002Ftd>\u003Ctd>BCD bit 1\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Pin 2 — C\u003C\u002Ftd>\u003Ctd>BCD bit 2\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Pin 6 — D\u003C\u002Ftd>\u003Ctd>BCD bit 3\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Pin 13 — a\u003C\u002Ftd>\u003Ctd>Display segment a\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Pin 12 — b\u003C\u002Ftd>\u003Ctd>Display segment b\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Pin 11 — c\u003C\u002Ftd>\u003Ctd>Display segment c\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Pin 10 — d\u003C\u002Ftd>\u003Ctd>Display segment d\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Pin 9 — e\u003C\u002Ftd>\u003Ctd>Display segment e\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Pin 15 — f\u003C\u002Ftd>\u003Ctd>Display segment f\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Pin 14 — g\u003C\u002Ftd>\u003Ctd>Display segment g\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Ch3>Do You Need Resistors With a 74LS47?\u003C\u002Fh3>\u003Cp>\u003Cstrong>Yes.\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>A current-limiting resistor should normally be placed in series with each LED segment.\u003C\u002Fp>\u003Cp>Without appropriate current limiting, excessive current can damage the LED display or operate the driver outside its intended electrical conditions.\u003C\u002Fp>\u003Cp>The correct resistance depends on:\u003C\u002Fp>\u003Col>\u003Cli>Supply voltage\u003C\u002Fli>\u003Cli>LED forward voltage\u003C\u002Fli>\u003Cli>Desired LED current\u003C\u002Fli>\u003Cli>Display construction\u003C\u002Fli>\u003Cli>SN74LS47 output voltage at the selected current\u003C\u002Fli>\u003C\u002Fol>\u003Ch3>How to Calculate the Segment Resistor\u003C\u002Fh3>\u003Cp>A simplified resistor calculation is:\u003C\u002Fp>R = (VSUPPLY - VF - VOL) \u002F ILED\u003Cp>For example:\u003C\u002Fp>VSUPPLY = 5 VVF = 2 VVOL ≈ 0.3 VILED = 8 mA\u003Cp>Then:\u003C\u002Fp>R ≈ (5 - 2 - 0.3) \u002F 0.008R ≈ 337.5 Ω\u003Cp>A nearby standard resistor value can then be selected after checking the electrical limits of the specific display and driver.\u003C\u002Fp>\u003Cp>Do not assume that 220 Ω or 330 Ω is automatically correct for every seven-segment display.\u003C\u002Fp>\u003Ch2>What Do LT, RBI and BI\u002FRBO Do?\u003C\u002Fh2>\u003Cp>The SN74LS47 contains three display-control functions that often confuse first-time users:\u003C\u002Fp>\u003Col>\u003Cli>LT\u003C\u002Fli>\u003Cli>RBI\u003C\u002Fli>\u003Cli>BI\u002FRBO\u003C\u002Fli>\u003C\u002Fol>\u003Cp>These pins are not part of the four-bit BCD value. They control testing, blanking, and zero suppression.\u003C\u002Fp>\u003Ch3>LT: Lamp Test\u003C\u002Fh3>\u003Cp>\u003Cstrong>LT\u003C\u002Fstrong> stands for \u003Cstrong>Lamp Test\u003C\u002Fstrong>.\u003C\u002Fp>\u003Cp>Its purpose is to illuminate the display segments so the display and segment connections can be checked independently of normal BCD decoding.\u003C\u002Fp>Lamp Test asserted↓Segments illuminate↓Check display operation\u003Cp>If one segment fails to illuminate during a correct lamp test, possible causes include:\u003C\u002Fp>\u003Col>\u003Cli>A failed LED segment\u003C\u002Fli>\u003Cli>An open current-limiting resistor\u003C\u002Fli>\u003Cli>Incorrect segment wiring\u003C\u002Fli>\u003Cli>A damaged PCB trace\u003C\u002Fli>\u003Cli>A driver output fault\u003C\u002Fli>\u003C\u002Fol>\u003Ch3>RBI: Ripple Blanking Input\u003C\u002Fh3>\u003Cp>\u003Cstrong>RBI\u003C\u002Fstrong> means \u003Cstrong>Ripple Blanking Input\u003C\u002Fstrong>.\u003C\u002Fp>\u003Cp>It is primarily used in multi-digit displays to suppress unnecessary leading or trailing zeros.\u003C\u002Fp>\u003Cp>For example:\u003C\u002Fp>Without leading-zero suppression:0025\u003Cbr \u002F>With leading-zero suppression:25\u003Cp>Ripple blanking allows several decoder stages to coordinate this behavior.\u003C\u002Fp>\u003Ch3>BI\u002FRBO: Blanking Input \u002F Ripple Blanking Output\u003C\u002Fh3>\u003Cp>Pin 4 performs two related functions:\u003C\u002Fp>\u003Col>\u003Cli>\u003Cstrong>BI — Blanking Input\u003C\u002Fstrong>\u003C\u002Fli>\u003Cli>\u003Cstrong>RBO — Ripple Blanking Output\u003C\u002Fstrong>\u003C\u002Fli>\u003C\u002Fol>\u003Cp>The blanking function can turn the display off regardless of the normal BCD value.\u003C\u002Fp>\u003Cp>The ripple-blanking output allows blanking information to propagate between multiple decoder stages, making automatic zero suppression possible in multi-digit displays.\u003C\u002Fp>\u003Ch2>How to Connect the SN74LS47N Step by Step\u003C\u002Fh2>\u003Cp>The following workflow can be used for a basic one-digit display circuit.\u003C\u002Fp>\u003Ch3>Step 1: Connect the Power Supply\u003C\u002Fh3>Pin 16 → VCCPin 8 → GND\u003Cp>Use the supply conditions specified for the SN74LS47 and the surrounding 74LS logic system.\u003C\u002Fp>\u003Ch3>Step 2: Connect the BCD Inputs\u003C\u002Fh3>Pin 7 → APin 1 → BPin 2 → CPin 6 → D\u003Cp>Remember:\u003C\u002Fp>A = LSBD = MSB\u003Ch3>Step 3: Connect the Segment Outputs\u003C\u002Fh3>Pin 13 → aPin 12 → bPin 11 → cPin 10 → dPin 9 → ePin 15 → fPin 14 → g\u003Cp>Each segment connection should include appropriate current limiting.\u003C\u002Fp>\u003Ch3>Step 4: Connect the Common-Anode Display\u003C\u002Fh3>\u003Cp>Use a \u003Cstrong>common-anode seven-segment display\u003C\u002Fstrong> and connect its common-anode terminal or terminals according to the display manufacturer's specifications.\u003C\u002Fp>\u003Cp>Do not assume that all seven-segment displays use the same physical package pinout. Always verify the selected display's datasheet.\u003C\u002Fp>\u003Ch3>Step 5: Configure LT, RBI and BI\u002FRBO\u003C\u002Fh3>\u003Cp>LT, RBI, and BI\u002FRBO must be placed in appropriate logic states for ordinary display operation.\u003C\u002Fp>\u003Cp>Do not intentionally leave display-control inputs undefined in a finished design.\u003C\u002Fp>\u003Cp>Unexpected states can cause:\u003C\u002Fp>\u003Col>\u003Cli>All segments to illuminate\u003C\u002Fli>\u003Cli>The display to remain blank\u003C\u002Fli>\u003Cli>Unexpected zero suppression\u003C\u002Fli>\u003C\u002Fol>\u003Ch2>SN74LS47N With Arduino\u003C\u002Fh2>\u003Cp>The SN74LS47 can also be controlled by a microcontroller such as an Arduino.\u003C\u002Fp>\u003Cp>Instead of using seven microcontroller GPIO pins to control seven individual LED segments, four GPIO outputs can provide the BCD input value.\u003C\u002Fp>\u003Ch3>Arduino Wiring\u003C\u002Fh3>Arduino D2 → SN74LS47 AArduino D3 → SN74LS47 BArduino D4 → SN74LS47 CArduino D5 → SN74LS47 D\u003Cp>The SN74LS47 then converts the four-bit value into the correct seven-segment pattern.\u003C\u002Fp>\u003Ch3>Arduino Example Code\u003C\u002Fh3>const int pinA = 2;const int pinB = 3;const int pinC = 4;const int pinD = 5;\u003Cbr \u002F>void setup() {pinMode(pinA, OUTPUT);pinMode(pinB, OUTPUT);pinMode(pinC, OUTPUT);pinMode(pinD, OUTPUT);}\u003Cbr \u002F>void displayDigit(byte digit) {digitalWrite(pinA, bitRead(digit, 0));digitalWrite(pinB, bitRead(digit, 1));digitalWrite(pinC, bitRead(digit, 2));digitalWrite(pinD, bitRead(digit, 3));}\u003Cbr \u002F>void loop() {for (byte digit = 0; digit <= 9; digit++) {displayDigit(digit);delay(1000);}}\u003Cp>The bit mapping is:\u003C\u002Fp>A ← bit 0B ← bit 1C ← bit 2D ← bit 3\u003Cp>For example:\u003C\u002Fp>Decimal 5 = Binary 0101\u003Cp>The decoder receives 0101 and generates the required segment pattern for the digit 5.\u003C\u002Fp>\u003Ch2>Can a 3.3V Microcontroller Drive the SN74LS47?\u003C\u002Fh2>\u003Cp>This question requires more analysis than simply saying that the SN74LS47 is a 5V logic device and therefore always requires a level shifter.\u003C\u002Fp>\u003Cp>Logic compatibility depends on input and output voltage thresholds rather than nominal supply voltage alone.\u003C\u002Fp>\u003Cp>For the SN74LS47 logic inputs, an important comparison is:\u003C\u002Fp>VIH minimum = 2.0 VVIL maximum = 0.8 V\u003Cp>A 3.3V CMOS output can therefore often produce a HIGH voltage that exceeds the SN74LS47's required HIGH threshold.\u003C\u002Fp>\u003Cp>However, designers should still verify:\u003C\u002Fp>\u003Col>\u003Cli>The MCU's guaranteed VOH at the relevant load current\u003C\u002Fli>\u003Cli>The MCU's guaranteed VOL\u003C\u002Fli>\u003Cli>SN74LS47 input current\u003C\u002Fli>\u003Cli>Shared ground\u003C\u002Fli>\u003Cli>Power sequencing\u003C\u002Fli>\u003Cli>Protection requirements\u003C\u002Fli>\u003Cli>Whether any 5V signal can feed back into the 3.3V device\u003C\u002Fli>\u003C\u002Fol>\u003Cblockquote>\u003Cstrong> A 3.3V logic HIGH may satisfy the SN74LS47 input threshold, but interface compatibility should be verified using the guaranteed specifications of the actual microcontroller rather than nominal voltage alone. \u003C\u002Fstrong>\u003C\u002Fblockquote>\u003Ch2>SN74LS47 vs SN74LS48\u003C\u002Fh2>\u003Cp>The SN74LS47 and SN74LS48 perform closely related BCD-to-seven-segment functions, but their display-driving arrangements differ.\u003C\u002Fp>\u003Ctable>\u003Ctbody>\u003Ctr>\u003Ctd>Feature\u003C\u002Ftd>\u003Ctd>SN74LS47\u003C\u002Ftd>\u003Ctd>SN74LS48\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Function\u003C\u002Ftd>\u003Ctd>BCD-to-7-segment decoder\u002Fdriver\u003C\u002Ftd>\u003Ctd>BCD-to-7-segment decoder\u002Fdriver\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Segment logic\u003C\u002Ftd>\u003Ctd>Active LOW\u003C\u002Ftd>\u003Ctd>Active HIGH\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Output style\u003C\u002Ftd>\u003Ctd>Open collector\u003C\u002Ftd>\u003Ctd>Different output arrangement suited to its target display type\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Typical display\u003C\u002Ftd>\u003Ctd>Common anode\u003C\u002Ftd>\u003Ctd>Common cathode\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Lamp test\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Ripple blanking\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Cp>The two devices should therefore not be treated as direct substitutes without checking the display type, output behavior, pinout, and electrical requirements.\u003C\u002Fp>\u003Ch3>Practical Selection Rule\u003C\u002Fh3>\u003Cp>For a conventional \u003Cstrong>common-anode\u003C\u002Fstrong> seven-segment display, the 74LS47 is the more typical choice.\u003C\u002Fp>\u003Cp>For a \u003Cstrong>common-cathode\u003C\u002Fstrong> display, a decoder\u002Fdriver designed for active-high segment control, such as the 74LS48 family, may be more appropriate.\u003C\u002Fp>\u003Ch2>7447 vs 74LS47: What Is the Difference?\u003C\u002Fh2>\u003Cp>The classic 7447 and 74LS47 perform the same general BCD-to-seven-segment function, but they belong to different TTL logic generations.\u003C\u002Fp>\u003Cp>The \u003Cstrong>LS\u003C\u002Fstrong> in 74LS47 means:\u003C\u002Fp>\u003Cblockquote>Low-Power Schottky\u003C\u002Fblockquote>\u003Cp>The 74LS family was developed to provide improved power\u002Fperformance characteristics compared with earlier standard TTL families.\u003C\u002Fp>\u003Cp>In replacement work, however, do not decide compatibility solely from the base function or a similar part number. Two devices may perform the same logic function while differing in package, output characteristics, electrical limits, timing, temperature rating, or other implementation details.\u003C\u002Fp>\u003Cp>Before substituting one logic IC for another, follow a structured \u003Ca href=\\\"https:\u002F\u002Foctatronics.com\u002Fresource\u002Fcomponents-guide\u002Fpin-to-pin-replacement-parts\\\" rel=\\\"noopener noreferrer\\\" target=\\\"_blank\\\"> pin-to-pin replacement compatibility check \u003C\u002Fa> rather than assuming that functionally similar parts are automatically drop-in compatible.\u003C\u002Fp>\u003Cp>When evaluating another manufacturer or a newer device family, it is also important to distinguish between a functional equivalent, a pin-compatible alternative, and a true drop-in replacement. See our \u003Ca href=\\\"https:\u002F\u002Foctatronics.com\u002Fresource\u002Ftechnical-knowledge\u002Fcross-reference-vs-drop-in-compatible\\\" rel=\\\"noopener noreferrer\\\" target=\\\"_blank\\\"> cross-reference vs drop-in compatibility guide \u003C\u002Fa> before approving an alternate component for production or repair.\u003C\u002Fp>\u003Ch2>Common SN74LS47N Applications\u003C\u002Fh2>\u003Cp>Although the SN74LS47 is associated with classic TTL logic systems, it can still be useful in:\u003C\u002Fp>\u003Col>\u003Cli>Digital counters\u003C\u002Fli>\u003Cli>Laboratory instruments\u003C\u002Fli>\u003Cli>Digital-logic education\u003C\u002Fli>\u003Cli>Frequency counters\u003C\u002Fli>\u003Cli>Event counters\u003C\u002Fli>\u003Cli>Scoreboards\u003C\u002Fli>\u003Cli>Basic numeric displays\u003C\u002Fli>\u003Cli>Legacy equipment repair\u003C\u002Fli>\u003Cli>Industrial panel displays\u003C\u002Fli>\u003Cli>Test fixtures\u003C\u002Fli>\u003Cli>74-series logic demonstrations\u003C\u002Fli>\u003C\u002Fol>\u003Cp>A typical signal chain is:\u003C\u002Fp>Clock \u002F Sensor Pulses↓BCD Counter↓SN74LS47↓7-Segment Display\u003Cp>The BCD counter generates the four-bit decimal count, while the SN74LS47 performs the segment decoding.\u003C\u002Fp>\u003Ch2>Multiple-Digit Displays and Zero Suppression\u003C\u002Fh2>\u003Cp>One useful feature of the SN74LS47 is its support for ripple blanking.\u003C\u002Fp>\u003Cp>Consider a three-digit display representing the number 5:\u003C\u002Fp>Without suppression:005\u003Cbr \u002F>With leading-zero suppression:5\u003Cp>By linking ripple-blanking signals across multiple decoder stages, unnecessary leading zeros can be removed automatically.\u003C\u002Fp>\u003Cp>This was especially useful in counters, measurement instruments, and other digital systems built from discrete logic rather than microcontrollers.\u003C\u002Fp>\u003Ch2>SN74LS47N Troubleshooting Guide\u003C\u002Fh2>\u003Ch3>Display Stays Completely Dark\u003C\u002Fh3>\u003Cp>Check:\u003C\u002Fp>\u003Col>\u003Cli>Pin 16 is connected to the correct supply\u003C\u002Fli>\u003Cli>Pin 8 is connected to ground\u003C\u002Fli>\u003Cli>The display is common anode\u003C\u002Fli>\u003Cli>The display common terminal is connected correctly\u003C\u002Fli>\u003Cli>BI\u002FRBO is not forcing blanking\u003C\u002Fli>\u003Cli>The current-limiting resistors are intact\u003C\u002Fli>\u003Cli>The segment wiring matches the display pinout\u003C\u002Fli>\u003C\u002Fol>\u003Ch3>All Segments Stay Illuminated\u003C\u002Fh3>\u003Cp>Check the \u003Cstrong>LT input\u003C\u002Fstrong> first. Lamp Test can override normal BCD decoding and illuminate all display segments.\u003C\u002Fp>\u003Cp>Also verify that the control input is not unintentionally being held in its asserted state.\u003C\u002Fp>\u003Ch3>Wrong Number Appears\u003C\u002Fh3>\u003Cp>Check the BCD input wiring carefully.\u003C\u002Fp>A = Pin 7B = Pin 1C = Pin 2D = Pin 6\u003Cp>A wiring mistake here can make the decoder appear faulty even when the IC is operating normally.\u003C\u002Fp>\u003Ch3>Individual Segments Are Incorrect\u003C\u002Fh3>\u003Cp>Check the segment output mapping:\u003C\u002Fp>a = Pin 13b = Pin 12c = Pin 11d = Pin 10e = Pin 9f = Pin 15g = Pin 14\u003Cp>Also verify the physical pinout of the seven-segment display itself.\u003C\u002Fp>\u003Ch3>Strange Characters Appear Above 9\u003C\u002Fh3>\u003Cp>Inputs from 1010 through 1111 are outside normal decimal BCD operation.\u003C\u002Fp>Normal decimal range:0000–1001\u003Cp>If a counter or microcontroller supplies values above decimal 9, the display may show non-decimal segment patterns.\u003C\u002Fp>\u003Ch3>Leading Zeros Will Not Disappear\u003C\u002Fh3>\u003Cp>Inspect:\u003C\u002Fp>\u003Col>\u003Cli>RBI\u003C\u002Fli>\u003Cli>BI\u002FRBO\u003C\u002Fli>\u003Cli>The connections between decoder stages\u003C\u002Fli>\u003C\u002Fol>\u003Cp>Zero suppression depends on the correct ripple-blanking configuration.\u003C\u002Fp>\u003Ch3>Display Brightness Is Too Low\u003C\u002Fh3>\u003Cp>Check:\u003C\u002Fp>\u003Col>\u003Cli>Segment resistor values\u003C\u002Fli>\u003Cli>LED forward voltage\u003C\u002Fli>\u003Cli>Driver current\u003C\u002Fli>\u003Cli>Supply voltage\u003C\u002Fli>\u003Cli>Wiring resistance\u003C\u002Fli>\u003Cli>The total load placed on the driver\u003C\u002Fli>\u003C\u002Fol>\u003Cp>Do not reduce resistor values blindly. Confirm the display current and driver limits first.\u003C\u002Fp>\u003Ch2>Common Mistakes When Using a 74LS47\u003C\u002Fh2>\u003Col>\u003Cli>\u003Cstrong>Using a common-cathode display:\u003C\u002Fstrong> The SN74LS47 is intended primarily for common-anode display driving.\u003C\u002Fli>\u003Cli>\u003Cstrong>Assuming pins 1–4 are A–D:\u003C\u002Fstrong> The BCD inputs are A = pin 7, B = pin 1, C = pin 2, and D = pin 6.\u003C\u002Fli>\u003Cli>\u003Cstrong>Omitting segment resistors:\u003C\u002Fstrong> Each LED segment needs suitable current limiting.\u003C\u002Fli>\u003Cli>\u003Cstrong>Ignoring LT, RBI, or BI\u002FRBO:\u003C\u002Fstrong> Incorrect states on these pins can override ordinary decoding.\u003C\u002Fli>\u003Cli>\u003Cstrong>Treating the outputs like ordinary GPIO:\u003C\u002Fstrong> SN74LS47 segment outputs are active-low and open collector.\u003C\u002Fli>\u003Cli>\u003Cstrong>Sending values above decimal 9:\u003C\u002Fstrong> BCD values 1010 through 1111 are outside the normal decimal range.\u003C\u002Fli>\u003C\u002Fol>\u003Ch2>SN74LS47N Key Specifications\u003C\u002Fh2>\u003Ctable>\u003Ctbody>\u003Ctr>\u003Ctd>Parameter\u003C\u002Ftd>\u003Ctd>SN74LS47N\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Device type\u003C\u002Ftd>\u003Ctd>BCD-to-seven-segment decoder\u002Fdriver\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Logic family\u003C\u002Ftd>\u003Ctd>LS TTL\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>BCD inputs\u003C\u002Ftd>\u003Ctd>4\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Segment outputs\u003C\u002Ftd>\u003Ctd>7\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Segment output logic\u003C\u002Ftd>\u003Ctd>Active LOW\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Output configuration\u003C\u002Ftd>\u003Ctd>Open collector\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Typical display type\u003C\u002Ftd>\u003Ctd>Common anode\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Lamp test\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Ripple blanking\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>SN74LS47N package\u003C\u002Ftd>\u003Ctd>16-pin PDIP\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Ch2>Is the SN74LS47N Still Useful?\u003C\u002Fh2>\u003Cp>For a completely new product, a microcontroller, integrated LED driver, or multiplexed display controller may provide more flexibility.\u003C\u002Fp>\u003Cp>However, the SN74LS47 remains relevant in several situations.\u003C\u002Fp>\u003Col>\u003Cli>Maintaining legacy TTL equipment\u003C\u002Fli>\u003Cli>Repairing existing 74LS47-based circuits\u003C\u002Fli>\u003Cli>Teaching combinational logic\u003C\u002Fli>\u003Cli>Building simple counters\u003C\u002Fli>\u003Cli>Interfacing BCD counters with numeric displays\u003C\u002Fli>\u003Cli>Replacing failed devices without redesigning the complete display system\u003C\u002Fli>\u003C\u002Fol>\u003Cp>For legacy equipment, keeping the original SN74LS47 architecture may be simpler and lower risk than redesigning the entire display circuit.\u003C\u002Fp>\u003Cp>If an exact device becomes difficult to source, proposed alternatives should be checked for electrical, mechanical, thermal, and functional compatibility before substitution.\u003C\u002Fp>\u003Cp>You can also view the \u003Ca href=\\\"https:\u002F\u002Foctatronics.com\u002Fcomponents\u002Ftexas-instruments-sn74ls47n\\\" rel=\\\"noopener noreferrer\\\" target=\\\"_blank\\\"> SN74LS47N product page \u003C\u002Fa> for component information or submit the part number to Octatronics for availability and sourcing support.\u003C\u002Fp>\u003Ch2>Frequently Asked Questions\u003C\u002Fh2>\u003Ch3>What Is the SN74LS47N?\u003C\u002Fh3>\u003Cp>The SN74LS47N is a BCD-to-seven-segment decoder\u002Fdriver from the 74LS TTL logic family. It accepts a four-bit BCD value and generates seven segment-control outputs for a numeric display.\u003C\u002Fp>\u003Ch3>What Type of Seven-Segment Display Works With a 74LS47?\u003C\u002Fh3>\u003Cp>The 74LS47 is intended primarily for \u003Cstrong>common-anode seven-segment displays\u003C\u002Fstrong> because its outputs are active low and open collector.\u003C\u002Fp>\u003Ch3>What Is the SN74LS47N Pinout?\u003C\u002Fh3>\u003Cp>The four BCD input pins are:\u003C\u002Fp>A = Pin 7B = Pin 1C = Pin 2D = Pin 6\u003Cp>VCC is pin 16, GND is pin 8, and the seven segment outputs are on pins 9 through 15.\u003C\u002Fp>\u003Ch3>What Does LT Mean on the 74LS47?\u003C\u002Fh3>\u003Cp>LT means \u003Cstrong>Lamp Test\u003C\u002Fstrong>. It is used to illuminate the display segments for testing independently of the normal BCD input value.\u003C\u002Fp>\u003Ch3>What Does RBI Mean on the 74LS47?\u003C\u002Fh3>\u003Cp>RBI means \u003Cstrong>Ripple Blanking Input\u003C\u002Fstrong>. It is part of the zero-suppression system used in multi-digit displays.\u003C\u002Fp>\u003Ch3>What Is BI\u002FRBO on the 74LS47?\u003C\u002Fh3>\u003Cp>BI\u002FRBO means \u003Cstrong>Blanking Input \u002F Ripple Blanking Output\u003C\u002Fstrong>. It can blank the display and propagate blanking information between decoder stages.\u003C\u002Fp>\u003Ch3>Is the 74LS47 Output Active High or Active Low?\u003C\u002Fh3>\u003Cp>The seven segment outputs are \u003Cstrong>active low\u003C\u002Fstrong>. Pulling the relevant output low allows the corresponding segment to illuminate in the intended common-anode circuit.\u003C\u002Fp>\u003Ch3>Can the SN74LS47 Drive a Common-Cathode Display?\u003C\u002Fh3>\u003Cp>A common-cathode display is not the normal configuration for the SN74LS47. The SN74LS47 is designed primarily around active-low driving of common-anode displays.\u003C\u002Fp>\u003Ch3>Does the SN74LS47 Need Current-Limiting Resistors?\u003C\u002Fh3>\u003Cp>Yes. Each LED segment requires appropriate current limiting. The correct resistor value depends on supply voltage, LED forward voltage, desired current, and driver characteristics.\u003C\u002Fp>\u003Ch3>Can an Arduino Control a 74LS47?\u003C\u002Fh3>\u003Cp>Yes. Four Arduino digital outputs can provide the BCD inputs A through D, allowing the SN74LS47 to generate the seven segment-control signals.\u003C\u002Fp>\u003Ch3>Can 3.3V Logic Drive the SN74LS47?\u003C\u002Fh3>\u003Cp>A 3.3V logic output can often satisfy the SN74LS47 input-high threshold, but compatibility should be confirmed using the guaranteed VOH and VOL specifications of the specific microcontroller.\u003C\u002Fp>\u003Ch3>What Happens When the SN74LS47 Input Is Greater Than 9?\u003C\u002Fh3>\u003Cp>BCD values 1010 through 1111 are outside the normal decimal range. The decoder may therefore generate non-decimal segment patterns rather than digits 0 through 9.\u003C\u002Fp>\u003Ch2>Conclusion\u003C\u002Fh2>\u003Cp>The \u003Cstrong>SN74LS47N\u003C\u002Fstrong> is more than a basic BCD decoder. It combines BCD-to-seven-segment conversion with active-low open-collector outputs, lamp testing, display blanking, and ripple blanking for multi-digit zero suppression.\u003C\u002Fp>\u003Cp>The most important points to remember are:\u003C\u002Fp>\u003Col>\u003Cli>It accepts four BCD inputs.\u003C\u002Fli>\u003Cli>\u003Cstrong>A is pin 7, not pin 1.\u003C\u002Fstrong>\u003C\u002Fli>\u003Cli>The seven segment outputs are active low.\u003C\u002Fli>\u003Cli>The outputs use an open-collector architecture.\u003C\u002Fli>\u003Cli>It is intended primarily for common-anode seven-segment displays.\u003C\u002Fli>\u003Cli>Each LED segment requires appropriate current limiting.\u003C\u002Fli>\u003Cli>LT provides lamp testing.\u003C\u002Fli>\u003Cli>RBI and BI\u002FRBO support display blanking and zero suppression.\u003C\u002Fli>\u003Cli>BCD inputs above decimal 9 are outside normal decimal operation.\u003C\u002Fli>\u003Cli>SN74LS47N identifies the 16-pin PDIP package version.\u003C\u002Fli>\u003C\u002Fol>\u003Cp>For legacy-equipment repair, digital-logic education, counter circuits, and straightforward BCD display systems, the SN74LS47N remains a useful device to understand.\u003C\u002Fp>\u003Cp>\u003Cstrong>Need an SN74LS47N or a compatible logic IC?\u003C\u002Fstrong>\u003C\u002Fp>\u003Cp>Octatronics helps engineers source electronic components and evaluate alternatives for prototypes, maintenance, and production requirements.\u003C\u002Fp>\u003Cp>\u003Ca href=\\\"https:\u002F\u002Foctatronics.com\u002Fcomponents\u002Ftexas-instruments-sn74ls47n\\\" rel=\\\"noopener noreferrer\\\" target=\\\"_blank\\\"> View SN74LS47N \u003C\u002Fa> | \u003Ca href=\\\"https:\u002F\u002Foctatronics.com\u002Frfq\\\" rel=\\\"noopener noreferrer\\\" target=\\\"_blank\\\"> Request a Quote \u003C\u002Fa>\u003C\u002Fp>","\u002Fprofile\u002Fupload\u002Fblog\u002Ftechnical-knowledge\u002Fcover-1.webp","Octatronics","1","0","SN74LS47N Pinout, Truth Table & Circuit Guide","2026-09-22T20:40:39.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":97,"slug":98,"orderNum":15,"delFlag":15},"Technical Knowledge","technical-knowledge",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":55,"name":100,"avatar":101,"role":102,"expertise":103,"intro":104,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},"Michael Anderson","\u002Fprofile\u002Fupload\u002F2026\u002F05\u002F03\u002Fmichael-anderson_20260503222635A003.jpg","Semiconductor Technical Writer","Device physics, integrated circuits, analog and digital electronics, power devices","Michael Anderson is a semiconductor technical writer covering device physics, integrated circuits, analog electronics, and power semiconductor technologies. He creates educational content that connects fundamental semiconductor theory with real engineering applications.\n\nHis articles explain topics such as p-n junctions, diodes, transistors, MOSFETs, operational amplifiers, power management ICs, and system-level semiconductor design. Michael’s writing is designed for engineers, students, and technical buyers who want accurate, structured, and application-oriented semiconductor knowledge.","admin","2026-09-22T12:40:39.000+08:00","2026-09-22T14:15:33.000+08:00",[],[110],1,[],[113,125,137,148,160,170,179,192],{"id":114,"title":115,"slug":116,"summary":117,"content":15,"coverImage":118,"category":15,"tags":15,"author":91,"viewCount":119,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":120,"categoryId":39,"authorId":39,"articleCategory":121,"articleAuthor":122,"delFlag":15,"createBy":15,"createTime":120,"updateBy":15,"updateTime":15,"productCategoryIds":15,"manufacturerIds":15,"applicationIds":15},28,"What Is a Field Effect Transistor? FET Types, Working Principle, Applications, and Selection Guide","field-effect-transistor-fet","A Field Effect Transistor, commonly called a FET, is a voltage-controlled semiconductor device that uses an electric field to control current flow between two terminals called the source and drain. Unlike bipolar junction transistors, which require input current at the base, FETs are controlled mainly by voltage at the gate terminal. This gives FETs high input impedance, low control power, and strong advantages in switching, amplification, power management, RF circuits, sensor interfaces, and modern integrated circuits.","\u002Fprofile\u002Fupload\u002Fblog\u002F2026\u002F06\u002F14\u002Ffield-effect-transistor-fet-cover.webp",183,"2026-06-28T12:59:46.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":97,"slug":98,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":123,"avatar":124,"role":15,"expertise":15,"intro":15,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},"Emily Roberts","\u002Fprofile\u002Fupload\u002F2026\u002F05\u002F03\u002Femily-roberts_20260503222557A001.jpg",{"id":126,"title":127,"slug":128,"summary":129,"content":15,"coverImage":130,"category":15,"tags":15,"author":91,"viewCount":131,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":132,"categoryId":39,"authorId":110,"articleCategory":133,"articleAuthor":134,"delFlag":15,"createBy":15,"createTime":132,"updateBy":15,"updateTime":15,"productCategoryIds":15,"manufacturerIds":15,"applicationIds":15},29,"Field Emission Transistor Explained: Vacuum FETs, Field Emission Devices, and How They Differ from FETs","field-emission-transistor-explained","A field emission transistor is a device concept that uses strong electric fields to extract electrons from an emitter, often through quantum tunneling, and then controls or collects those electrons using nearby electrodes. Unlike a conventional field effect transistor, which controls current through a semiconductor channel, many field emission transistor concepts are related to vacuum electronics, vacuum field emission transistors, nanoscale vacuum channel transistors, and advanced field emission devices.","\u002Fprofile\u002Fupload\u002Fblog\u002F2026\u002F06\u002F14\u002Ffield-emission-transistor-explained-cover.webp",172,"2026-06-28T22:54:31.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":97,"slug":98,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":110,"name":135,"avatar":136,"role":15,"expertise":15,"intro":15,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},"David Chen","\u002Fprofile\u002Fupload\u002F2026\u002F05\u002F03\u002Fdavid-chen_20260503222607A002.jpg",{"id":138,"title":139,"slug":140,"summary":141,"content":15,"coverImage":142,"category":15,"tags":15,"author":91,"viewCount":143,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":144,"categoryId":39,"authorId":110,"articleCategory":145,"articleAuthor":146,"delFlag":15,"createBy":15,"createTime":147,"updateBy":15,"updateTime":15,"productCategoryIds":15,"manufacturerIds":15,"applicationIds":15},35,"PNP vs NPN vs P-Channel MOSFET: How to Choose the Right Transistor for Switching Circuits","pnp-vs-npn-vs-mosfet","PNP, NPN, and MOSFET transistors are widely used for electronic switching and control applications, but each device has different operating principles and performance characteristics. This guide explains the key differences between PNP vs NPN vs MOSFET, including switching behavior, efficiency, applications, and how engineers select the right transistor for different circuit designs.","\u002Fprofile\u002Fupload\u002Fblog\u002F2026\u002F06\u002F14\u002Fpnp-vs-npn-vs-mosfet-cover.webp",416,"2026-07-07T07:15:34.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":97,"slug":98,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":110,"name":135,"avatar":136,"role":15,"expertise":15,"intro":15,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},"2026-07-06T23:15:34.000+08:00",{"id":149,"title":150,"slug":151,"summary":152,"content":15,"coverImage":153,"category":97,"tags":154,"author":100,"viewCount":155,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":156,"categoryId":39,"authorId":55,"articleCategory":157,"articleAuthor":158,"delFlag":15,"createBy":15,"createTime":159,"updateBy":15,"updateTime":15,"productCategoryIds":15,"manufacturerIds":15,"applicationIds":15},42,"Cross-Reference vs True Drop-In: What \"Compatible\" Really Means","cross-reference-vs-drop-in-compatible","Cross, equivalent, replacement, second source — vendors use these words loosely. A four-level compatibility scale that maps each term to the engineering work it actually implies, plus a triage workflow for cross-reference lists.","\u002Fprofile\u002Fupload\u002Fblog\u002F2026\u002F07\u002F22\u002Fcross-reference-vs-drop-in-compatible-cover.webp","cross reference, drop-in replacement, equivalent part, second source, component substitution, compatible parts",145,"2026-08-06T10:00:00.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":97,"slug":98,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":55,"name":100,"avatar":101,"role":15,"expertise":15,"intro":15,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},"2026-07-22T23:56:24.000+08:00",{"id":161,"title":162,"slug":163,"summary":164,"content":15,"coverImage":165,"category":15,"tags":15,"author":91,"viewCount":166,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":167,"categoryId":39,"authorId":55,"articleCategory":168,"articleAuthor":169,"delFlag":15,"createBy":15,"createTime":167,"updateBy":15,"updateTime":15,"productCategoryIds":15,"manufacturerIds":15,"applicationIds":15},24,"Thermal Resistance Explained: thetaJA, thetaJC, psiJT, Power Dissipation, and Derating","thermal-resistance-theta-ja-theta-jc-psijt-power-dissipation","Thermal resistance metrics such as thetaJA, thetaJC, and psiJT help estimate semiconductor junction temperature, but each metric has a different purpose. thetaJA is useful for standardized package comparison, thetaJC applies to controlled case or heat-sink paths, and psiJT is often used with measured package-top temperature. Buyers should review thermal data before approving power ICs, regulators, MOSFETs, and package substitutions because identical electrical ratings do not guarantee the same thermal margin.","\u002Fprofile\u002Fupload\u002Fblog\u002F2026\u002F06\u002F14\u002Fthermal-resistance-theta-ja-theta-jc-psijt-power-dissipation-cover.webp",474,"2026-06-24T06:56:22.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":97,"slug":98,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":55,"name":100,"avatar":101,"role":15,"expertise":15,"intro":15,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},{"id":39,"title":171,"slug":172,"summary":173,"content":15,"coverImage":174,"category":15,"tags":15,"author":91,"viewCount":175,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":176,"categoryId":39,"authorId":110,"articleCategory":177,"articleAuthor":178,"delFlag":15,"createBy":15,"createTime":176,"updateBy":15,"updateTime":15,"productCategoryIds":15,"manufacturerIds":15,"applicationIds":15},"Semiconductor Basics: From Device Physics to System-Level Design","semiconductor-basics-device-physics-system-design","Learn semiconductor basics from device physics and p-n junctions to diodes, transistors, ICs, power devices, datasheet parameters, reliability, and system-level hardware design.","\u002Fprofile\u002Fupload\u002Fblog\u002Fundefined\u002Fcover-2.webp",613,"2026-05-03T17:59:06.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":97,"slug":98,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":110,"name":135,"avatar":136,"role":15,"expertise":15,"intro":15,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},{"id":180,"title":181,"slug":182,"summary":183,"content":15,"coverImage":184,"category":15,"tags":15,"author":91,"viewCount":185,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":186,"categoryId":39,"authorId":66,"articleCategory":187,"articleAuthor":188,"delFlag":15,"createBy":15,"createTime":191,"updateBy":15,"updateTime":15,"productCategoryIds":15,"manufacturerIds":15,"applicationIds":15},43,"Low-Pass vs High-Pass Filter: Differences, Circuits, Cutoff Frequency, and Applications","low-pass-vs-high-pass-filter","Learn how low-pass and high-pass filters differ, how their RC circuits work, how to calculate cutoff frequency, and how to select the right filter for signal conditioning, audio, ADC, power, and RF applications.","\u002Fprofile\u002Fupload\u002Fblog\u002Ftechnical-knowledge\u002Fcover.webp",411,"2026-07-27T14:43:05.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":97,"slug":98,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":66,"name":189,"avatar":190,"role":15,"expertise":15,"intro":15,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},"Sarah Miller","\u002Fprofile\u002Fupload\u002F2026\u002F05\u002F03\u002Fsarah-miller_20260503222700A004.jpg","2026-07-27T06:43:04.000+08:00",{"id":193,"title":194,"slug":195,"summary":196,"content":15,"coverImage":197,"category":15,"tags":15,"author":91,"viewCount":198,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":199,"categoryId":39,"authorId":110,"articleCategory":200,"articleAuthor":201,"delFlag":15,"createBy":15,"createTime":199,"updateBy":15,"updateTime":15,"productCategoryIds":15,"manufacturerIds":15,"applicationIds":15},23,"IC Top Marking Codes Explained: How to Identify SMD Chips from Package Markings","ic-top-marking-codes-smd-chip-identification","IC top marking codes are abbreviated package markings used to identify semiconductor devices, especially small SMD chips that cannot fit a full part number. Buyers should use the marking as a starting point, then verify manufacturer logo, package, pin count, date code, lot code, datasheet, packing label, and supplier documentation. Official manufacturer marking tools and datasheets should be used before relying on third-party SMD code databases.","\u002Fprofile\u002Fupload\u002Fblog\u002F2026\u002F06\u002F14\u002Fic-top-marking-codes-smd-chip-identification-cover.webp",1855,"2026-06-24T06:53:56.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":97,"slug":98,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":110,"name":135,"avatar":136,"role":15,"expertise":15,"intro":15,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},[203,209,213,219,225],{"createBy":105,"createTime":204,"updateBy":105,"updateTime":205,"remark":206,"id":55,"name":207,"slug":208,"orderNum":110,"delFlag":93},"2026-04-10 07:22:11","2026-04-30 21:31:18","元件选型差异、Pin-to-Pin 替代方案、封装与硬核硬件设计指南。\n\n这个分类非常适合做 SEO 流量。\n\n主要写：\n\n电子元器件选型指南\n某类元件怎么选\n某个型号与替代型号区别\nPin-to-Pin 替代方案\n封装差异\n参数对比\n选型错误避坑\n\n适合文章例子：\n\nHow to Choose the Right MOSFET for Your Circuit\nSMD Capacitor Package Sizes Explained\nLDO vs Switching Regulator: Which One Should You Use?\nTUSB3410VF vs TUSB3410VFG4: What Is the Difference?\n\n这个分类以后最容易带来精准询盘，因为搜索这些内容的人很多是工程师或采购。","Components Guide","components-guide",{"createBy":105,"createTime":210,"updateBy":105,"updateTime":211,"remark":212,"id":39,"name":97,"slug":98,"orderNum":39,"delFlag":93},"2026-04-10 07:20:22","2026-04-30 21:31:47","半导体底层原理、系统架构深度解析、高阶技术白皮书\n\n这个分类适合做专业度和 EEAT。\n\n主要写：\n\n半导体基础原理\n电路基础\n系统架构\n通信接口\n电源设计基础\n模拟\u002F数字\u002F射频知识\n工程概念解释\n\n适合文章例子：\n\nWhat Is a PN Junction?\nWhat Does an Op-Amp Do?\nI2C vs SPI vs UART Explained\nWhat Is a Voltage Reference?\nHow ADC Resolution Affects Measurement Accuracy\n\n注意：\n这个分类不要写成纯科普百科，要尽量和元器件、BOM、选型、应用场景连接起来。否则容易有流量但转化弱。",{"createBy":105,"createTime":214,"updateBy":105,"updateTime":215,"remark":216,"id":110,"name":217,"slug":218,"orderNum":55,"delFlag":93},"2026-04-03 22:42:14","2026-04-30 21:32:17","厂商并购、新厂动态、全球半导体政策及原厂重大公告。\n\n这个分类适合让网站看起来“活跃”，但不是最优先的 SEO 分类。\n\n主要写：\n\n半导体厂商并购\n新工厂扩产\n政策变化\n原厂公告\n行业重大事件\nAI、汽车、工业、存储、功率半导体动态\n\n适合文章例子：\n\nSemiconductor Industry Trends in 2026\nHow AI Demand Is Changing the Semiconductor Supply Chain\nMajor Power Semiconductor Trends for Industrial Electronics\n\n但是要注意：\nIndustry News 内容时效性强，过期快。 刚上线可以放 2–3 篇撑门面，但不要把主要精力放这里。","Industry News","semiconductor-industry-news",{"createBy":105,"createTime":220,"updateBy":105,"updateTime":221,"remark":222,"id":66,"name":223,"slug":224,"orderNum":66,"delFlag":93},"2026-04-10 07:33:53","2026-04-30 21:32:30","交期（Lead Time）趋势分析、价格波动、供应链风险预警（采购必看）。\n\n这个分类对 Octatronics 很有价值，因为它更贴近采购决策。\n\n主要写：\n\nLead time 趋势\n价格波动\n缺货风险\nEOL 风险\n供应链风险\n采购策略\n替代料策略\nBOM 成本控制\n\n适合文章例子：\n\nElectronic Component Lead Times: What Buyers Should Watch\nWhy Some IC Prices Rise During Shortage Cycles\nHow to Reduce BOM Sourcing Risk\nObsolete Components: How to Plan Before Production Stops\n\n这个分类是给采购、供应链经理、OEM、EMS 看，非常适合引导 RFQ。","Market Insights","market-insights",{"createBy":105,"createTime":226,"updateBy":105,"updateTime":227,"remark":228,"id":229,"name":230,"slug":231,"orderNum":229,"delFlag":93},"2026-04-10 07:34:12","2026-04-30 21:36:18","新产品系列上架、EOL（停产）预警、Datasheet 核心变更说明\n\n\n这个分类本身合理，但名字有一点偏“公司自己产品更新”的感觉。Octatronics 不是原厂，所以 Product Updates 需要定义清楚。\n\n可以写：\n\n新品系列介绍\nEOL 停产预警\nPCN 变更\nDatasheet 更新\n原厂推荐替代型号\n某系列器件更新\n某个品牌产品线变化\n\n适合文章例子：\n\nHow to Read an EOL Notice for Electronic Components\nWhat Is a Product Change Notification?\nDatasheet Revision: What Engineers Should Check\nHow to Evaluate Manufacturer Recommended Replacements\n\n如果想更准确，我建议把分类名改成：\n\nProduct Updates & Lifecycle\n\n或者：\n\nProduct Lifecycle Updates\n\n这样更符合电子元器件分销商的内容定位。",5,"Product News","product-news",[233,242,251,260,265,272,279,288,298,305],{"id":234,"mpn":235,"title":-1,"manufacturer":236,"manufacturerSlug":237,"categoryName":238,"categorySlug":239,"categorySlugPath":240,"shortDesc":-1,"coverImageUrl":-1,"slug":241},215437,"AT25256AW-10SI-1.8","Microchip Technology","microchip-technology","EEPROM","eeprom","integrated-circuits-ics\u002Fmemory-ics\u002Feeprom","microchip-technology-at25256aw-10si-1-8",{"id":243,"mpn":244,"title":-1,"manufacturer":245,"manufacturerSlug":246,"categoryName":247,"categorySlug":248,"categorySlugPath":249,"shortDesc":-1,"coverImageUrl":-1,"slug":250},164758,"MAX16047ETN+CC7","Analog Devices","analog-devices","Supervisors","supervisors","integrated-circuits-ics\u002Fpower-management-ics\u002Fsupervisors","analog-devices-max16047etn-cc7",{"id":252,"mpn":253,"title":-1,"manufacturer":254,"manufacturerSlug":255,"categoryName":256,"categorySlug":257,"categorySlugPath":258,"shortDesc":-1,"coverImageUrl":-1,"slug":259},207605,"XMC7100D-F100K2112AA","Infineon Technologies","infineon-technologies","Microcontrollers","microcontrollers","integrated-circuits-ics\u002Fembedded-processors-and-controllers\u002Fmicrocontrollers","infineon-technologies-xmc7100d-f100k2112aa",{"id":261,"mpn":262,"title":-1,"manufacturer":245,"manufacturerSlug":246,"categoryName":256,"categorySlug":257,"categorySlugPath":258,"shortDesc":263,"coverImageUrl":-1,"slug":264},14582,"ADL5544ARKZ-R7","IC RF AMP GPS 30MHZ-6GHZ SOT89-3","analog-devices-adl5544arkz-r7",{"id":266,"mpn":267,"title":-1,"manufacturer":254,"manufacturerSlug":255,"categoryName":268,"categorySlug":269,"categorySlugPath":270,"shortDesc":-1,"coverImageUrl":-1,"slug":271},207001,"WLC1150-68LQXQT","Special Purpose Power Management ICs","special-purpose-power-management-ics","integrated-circuits-ics\u002Fpower-management-ics\u002Fspecial-purpose-power-management-ics","infineon-technologies-wlc1150-68lqxqt",{"id":273,"mpn":274,"title":-1,"manufacturer":275,"manufacturerSlug":276,"categoryName":256,"categorySlug":257,"categorySlugPath":258,"shortDesc":277,"coverImageUrl":-1,"slug":278},58159,"STM32F423MHY6TR","STMicroelectronics","stmicroelectronics","High-performance access line, Arm Cortex-M4 core with DSP and FPU, 1,5 MByte of Flash memory, 100 MHz CPU, ART Accelerator, DFSDM, AES","stmicroelectronics-stm32f423mhy6tr",{"id":280,"mpn":281,"title":-1,"manufacturer":282,"manufacturerSlug":283,"categoryName":284,"categorySlug":285,"categorySlugPath":286,"shortDesc":-1,"coverImageUrl":-1,"slug":287},423200,"SN74LS374NSR","Texas Instruments","texas-instruments","Flip Flops","flip-flops","integrated-circuits-ics\u002Flogic-ics\u002Fflip-flops","texas-instruments-sn74ls374nsr",{"id":289,"mpn":290,"title":-1,"manufacturer":291,"manufacturerSlug":292,"categoryName":293,"categorySlug":294,"categorySlugPath":295,"shortDesc":296,"coverImageUrl":-1,"slug":297},103455,"CRCW080520K0JNEA","Vishay","vishay","Chip Resistors","chip-resistors","passive-components\u002Fresistors\u002Fchip-resistors","0805 20kR 5% 150V Thick Film Resistor, SMD","vishay-crcw080520k0jnea",{"id":299,"mpn":300,"title":-1,"manufacturer":245,"manufacturerSlug":246,"categoryName":301,"categorySlug":302,"categorySlugPath":303,"shortDesc":-1,"coverImageUrl":-1,"slug":304},150957,"LTC3412AEUF#TRPBF","DC DC Switching Regulators","dc-dc-switching-regulators","integrated-circuits-ics\u002Fpower-management-ics\u002Fdc-dc-switching-regulators","analog-devices-ltc3412aeuf-trpbf",{"id":306,"mpn":307,"title":-1,"manufacturer":245,"manufacturerSlug":246,"categoryName":308,"categorySlug":309,"categorySlugPath":310,"shortDesc":311,"coverImageUrl":-1,"slug":312},137241,"LT3066EMSE-5#TRPBF","Voltage Regulators - Linear","voltage-regulators-linear","integrated-circuits-ics\u002Fpower-management-ics\u002Fvoltage-regulators-linear","Linear Voltage Regulator IC Positive Fixed 1 Output 500mA 12-MSOP-EP","analog-devices-lt3066emse-5-trpbf"]