[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"layout-global":3,"blog-detail-low-pass-vs-high-pass-filter":84,"blog-related-articles-low-pass-vs-high-pass-filter":116,"blog-categories-sidebar":205,"article-related-products-low-pass-vs-high-pass-filter":235},{"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":66,"isPublished":92,"isTop":93,"seoTitle":94,"seoDesc":95,"seoKeywords":15,"faqJson":15,"publishTime":96,"categoryId":39,"authorId":66,"articleCategory":97,"articleAuthor":100,"delFlag":93,"createBy":106,"createTime":107,"updateBy":106,"updateTime":108,"productCategoryIds":109,"manufacturerIds":112,"applicationIds":115},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.","\u003Cp>Electronic systems often need to separate useful signals from unwanted frequency components. A \u003Ca href=\\\"https:\u002F\u002Foctatronics.com\u002Fc\u002Fsensors\u002F\\\" rel=\\\"noopener noreferrer\\\" target=\\\"_blank\\\">sensor\u003C\u002Fa> interface may need to remove high-frequency noise, an amplifier may need to reject DC offset, and an ADC may require attenuation above its usable signal bandwidth. Low-pass and high-pass filters address these problems in opposite ways.\u003C\u002Fp>\u003Cp>\u003Cstrong>Quick answer:\u003C\u002Fstrong> A low-pass filter passes frequencies below its cutoff frequency and attenuates higher frequencies. A high-pass filter passes frequencies above its cutoff and attenuates lower frequencies. In a basic RC circuit, the low-pass output is measured across the capacitor, while the high-pass output is measured across the resistor.\u003C\u002Fp>\u003Cp>Neither filter behaves like an ideal on\u002Foff switch. A real filter has a transition region, and its attenuation increases gradually according to its order and response type.\u003C\u002Fp>\u003Ch2>Low-Pass vs High-Pass Filter: Quick Comparison\u003C\u002Fh2>\u003Ctable>\u003Ctbody>\u003Ctr>\u003Ctd>Feature\u003C\u002Ftd>\u003Ctd>Low-Pass Filter\u003C\u002Ftd>\u003Ctd>High-Pass Filter\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Frequencies passed\u003C\u002Ftd>\u003Ctd>Below the cutoff frequency\u003C\u002Ftd>\u003Ctd>Above the cutoff frequency\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Frequencies attenuated\u003C\u002Ftd>\u003Ctd>Above the cutoff frequency\u003C\u002Ftd>\u003Ctd>Below the cutoff frequency\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>DC response\u003C\u002Ftd>\u003Ctd>Passes DC\u003C\u002Ftd>\u003Ctd>Blocks DC in steady state\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Basic RC output\u003C\u002Ftd>\u003Ctd>Measured across the capacitor\u003C\u002Ftd>\u003Ctd>Measured across the resistor\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>First-order roll-off\u003C\u002Ftd>\u003Ctd>−20 dB\u002Fdecade above cutoff\u003C\u002Ftd>\u003Ctd>+20 dB\u002Fdecade below cutoff\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Phase response\u003C\u002Ftd>\u003Ctd>Output progressively lags input\u003C\u002Ftd>\u003Ctd>Output progressively leads input at lower frequencies\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Time-domain effect\u003C\u002Ftd>\u003Ctd>Smooths rapid changes\u003C\u002Ftd>\u003Ctd>Emphasizes rapid changes and edges\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Common applications\u003C\u002Ftd>\u003Ctd>Noise reduction, anti-aliasing, PWM smoothing\u003C\u002Ftd>\u003Ctd>AC coupling, DC removal, baseline-drift suppression\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Cp>The words “low” and “high” are always relative to the selected cutoff frequency. A 10 kHz signal may be in the passband of one low-pass filter and in the stopband of another.\u003C\u002Fp>\u003Ch2>What Is a Frequency Filter?\u003C\u002Fh2>\u003Cp>A frequency filter is a circuit or algorithm that changes a signal according to frequency. Important filter terms include:\u003C\u002Fp>\u003Col>\u003Cli>\u003Cstrong>Passband:\u003C\u002Fstrong> The frequency range intended to pass with acceptable loss.\u003C\u002Fli>\u003Cli>\u003Cstrong>Stopband:\u003C\u002Fstrong> The range that must be sufficiently attenuated.\u003C\u002Fli>\u003Cli>\u003Cstrong>Transition band:\u003C\u002Fstrong> The region between the passband and stopband.\u003C\u002Fli>\u003Cli>\u003Cstrong>Cutoff frequency:\u003C\u002Fstrong> A defined boundary or corner in the frequency response.\u003C\u002Fli>\u003Cli>\u003Cstrong>Attenuation:\u003C\u002Fstrong> The amount by which a signal is reduced, commonly expressed in decibels.\u003C\u002Fli>\u003Cli>\u003Cstrong>Phase shift:\u003C\u002Fstrong> The frequency-dependent timing difference between the input and output.\u003C\u002Fli>\u003Cli>\u003Cstrong>Filter order:\u003C\u002Fstrong> The number of poles governing the ultimate roll-off rate.\u003C\u002Fli>\u003C\u002Fol>\u003Cp>For a first-order RC filter, and for the conventional Butterworth response, the cutoff is the −3 dB point. The output voltage magnitude there is approximately 70.7% of the passband value—not zero.\u003C\u002Fp>\u003Cp>Other filter families may define their important band edge differently. For example, a Chebyshev filter’s specified cutoff can refer to the edge of its allowed ripple rather than exactly −3 dB.\u003C\u002Fp>\u003Ch2>What Is a Low-Pass Filter?\u003C\u002Fh2>\u003Cp>A low-pass filter, or LPF, allows lower-frequency components to reach the output while progressively attenuating higher-frequency components.\u003C\u002Fp>\u003Cp>In a basic passive RC low-pass filter:\u003C\u002Fp>\u003Col>\u003Cli>A \u003Ca href=\\\"https:\u002F\u002Foctatronics.com\u002Fc\u002Fpassive-components\u002Fresistors\u002F\\\" rel=\\\"noopener noreferrer\\\" target=\\\"_blank\\\">resistor\u003C\u002Fa> is connected in series with the signal.\u003C\u002Fli>\u003Cli>A \u003Ca href=\\\"https:\u002F\u002Foctatronics.com\u002Fc\u002Fpassive-components\u002Fcapacitors\u002F\\\" rel=\\\"noopener noreferrer\\\" target=\\\"_blank\\\">capacitor\u003C\u002Fa> is connected from the output node to ground.\u003C\u002Fli>\u003Cli>The output is measured across the capacitor.\u003C\u002Fli>\u003C\u002Fol>\u003Cp>A capacitor’s reactance is:\u003C\u002Fp>\u003Cp>[\u003C\u002Fp>\u003Cp>X_C=\\frac{1}{2\\pi fC}\u003C\u002Fp>\u003Cp>]\u003C\u002Fp>\u003Cp>At low frequencies, the capacitor has relatively high impedance, so little signal is diverted to ground and the output remains close to the input. As frequency increases, the capacitor impedance falls, directing more of the high-frequency signal toward ground.\u003C\u002Fp>\u003Cp>A low-pass filter can therefore smooth abrupt waveform changes. If a square wave is applied to a sufficiently low-cutoff RC filter, the output edges become rounded. With a time constant much longer than the pulse period, the circuit can behave approximately like an integrator.\u003C\u002Fp>\u003Cp>Typical low-pass filter applications include:\u003C\u002Fp>\u003Col>\u003Cli>Filtering high-frequency noise from analog sensors\u003C\u002Fli>\u003Cli>Limiting bandwidth before an ADC\u003C\u002Fli>\u003Cli>Smoothing PWM into an approximate analog voltage\u003C\u002Fli>\u003Cli>Removing DAC image components\u003C\u002Fli>\u003Cli>Reducing high-frequency noise on references or low-current supply nodes\u003C\u002Fli>\u003Cli>Routing low-frequency audio to a woofer\u003C\u002Fli>\u003Cli>Suppressing harmonics in signal-generation circuits\u003C\u002Fli>\u003C\u002Fol>\u003Cp>An anti-aliasing filter must be designed from the required signal bandwidth, sampling rate and stopband attenuation. Simply placing the −3 dB corner at the Nyquist frequency does not guarantee sufficient rejection.\u003C\u002Fp>\u003Ch2>What Is a High-Pass Filter?\u003C\u002Fh2>\u003Cp>A high-pass filter, or HPF, passes higher-frequency signal components while attenuating low-frequency components.\u003C\u002Fp>\u003Cp>In a basic passive RC high-pass filter:\u003C\u002Fp>\u003Col>\u003Cli>A capacitor is placed in series with the signal.\u003C\u002Fli>\u003Cli>A resistor is connected from the output node to ground.\u003C\u002Fli>\u003Cli>The output is measured across the resistor.\u003C\u002Fli>\u003C\u002Fol>\u003Cp>At DC, the series capacitor eventually behaves like an open circuit, preventing a steady voltage from reaching the output. At higher frequencies, its reactance decreases and more of the changing signal appears across the resistor.\u003C\u002Fp>\u003Cp>This makes high-pass filters useful for:\u003C\u002Fp>\u003Col>\u003Cli>AC coupling between amplifier stages\u003C\u002Fli>\u003Cli>Removing DC offsets\u003C\u002Fli>\u003Cli>Suppressing slow sensor baseline drift\u003C\u002Fli>\u003Cli>Reducing low-frequency motion artifacts\u003C\u002Fli>\u003Cli>Removing rumble from audio signals\u003C\u002Fli>\u003Cli>Routing high-frequency audio to a tweeter\u003C\u002Fli>\u003Cli>Detecting transitions or waveform edges\u003C\u002Fli>\u003Cli>Rejecting low-frequency interference in communication systems\u003C\u002Fli>\u003C\u002Fol>\u003Cp>When its cutoff frequency is high relative to the input waveform’s fundamental frequency, a first-order high-pass filter can approximate a differentiator. A square-wave input then produces positive and negative pulses around its rising and falling edges.\u003C\u002Fp>\u003Ch2>Low-Pass and High-Pass RC Circuits\u003C\u002Fh2>\u003Cp>The same resistor and capacitor values can produce either a low-pass or high-pass response. What matters is the circuit topology and the point from which the output is measured.\u003C\u002Fp>\u003Ctable>\u003Ctbody>\u003Ctr>\u003Ctd>Circuit\u003C\u002Ftd>\u003Ctd>Series element\u003C\u002Ftd>\u003Ctd>Shunt element\u003C\u002Ftd>\u003Ctd>Output measured across\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>RC low-pass\u003C\u002Ftd>\u003Ctd>Resistor\u003C\u002Ftd>\u003Ctd>Capacitor\u003C\u002Ftd>\u003Ctd>Capacitor\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>RC high-pass\u003C\u002Ftd>\u003Ctd>Capacitor\u003C\u002Ftd>\u003Ctd>Resistor\u003C\u002Ftd>\u003Ctd>Resistor\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Cp>It is therefore incomplete to say that the components are simply “swapped.” Filter behavior depends on the complete impedance network and the selected output node.\u003C\u002Fp>\u003Cp>In practical circuits, the signal source impedance becomes part of the filter. The next stage’s input impedance also loads the output. Consequently, the actual cutoff frequency can differ from a calculation that includes only the labeled R and C.\u003C\u002Fp>\u003Ch2>RC Filter Cutoff Frequency Formula\u003C\u002Fh2>\u003Cp>For an unloaded first-order RC low-pass or high-pass filter, the cutoff frequency is:\u003C\u002Fp>\u003Cp>[\u003C\u002Fp>\u003Cp>f_c=\\frac{1}{2\\pi RC}\u003C\u002Fp>\u003Cp>]\u003C\u002Fp>\u003Cp>The equation can be rearranged to select either component:\u003C\u002Fp>\u003Cp>[\u003C\u002Fp>\u003Cp>R=\\frac{1}{2\\pi f_cC}\u003C\u002Fp>\u003Cp>]\u003C\u002Fp>\u003Cp>[\u003C\u002Fp>\u003Cp>C=\\frac{1}{2\\pi f_cR}\u003C\u002Fp>\u003Cp>]\u003C\u002Fp>\u003Cp>Where:\u003C\u002Fp>\u003Col>\u003Cli>(f_c) is in hertz\u003C\u002Fli>\u003Cli>(R) is in ohms\u003C\u002Fli>\u003Cli>(C) is in farads\u003C\u002Fli>\u003C\u002Fol>\u003Cp>At (f_c), the resistor magnitude equals the capacitor reactance:\u003C\u002Fp>\u003Cp>[\u003C\u002Fp>\u003Cp>R=|X_C|\u003C\u002Fp>\u003Cp>]\u003C\u002Fp>\u003Cp>The voltage magnitude of either filter is then:\u003C\u002Fp>\u003Cp>[\u003C\u002Fp>\u003Cp>|V_{out}|\\approx0.707|V_{in}|\u003C\u002Fp>\u003Cp>]\u003C\u002Fp>\u003Cp>In decibels:\u003C\u002Fp>\u003Cp>[\u003C\u002Fp>\u003Cp>20\\log_{10}(0.707)\\approx-3.01\\text{ dB}\u003C\u002Fp>\u003Cp>]\u003C\u002Fp>\u003Cp>The cutoff frequency is therefore not a point where the signal is completely blocked. It is a defined point within the transition between passband and stopband.\u003C\u002Fp>\u003Ch2>Worked RC Filter Example\u003C\u002Fh2>\u003Cp>Suppose a circuit uses:\u003C\u002Fp>\u003Col>\u003Cli>(R=3.3,k\\Omega)\u003C\u002Fli>\u003Cli>(C=100,nF)\u003C\u002Fli>\u003C\u002Fol>\u003Cp>The calculated cutoff frequency is:\u003C\u002Fp>\u003Cp>[\u003C\u002Fp>\u003Cp>f_c=\\frac{1}{2\\pi(3300)(100\\times10^{-9})}\u003C\u002Fp>\u003Cp>]\u003C\u002Fp>\u003Cp>[\u003C\u002Fp>\u003Cp>f_c\\approx482\\text{ Hz}\u003C\u002Fp>\u003Cp>]\u003C\u002Fp>\u003Cp>For the low-pass filter, the magnitude response is:\u003C\u002Fp>\u003Cp>[\u003C\u002Fp>\u003Cp>|H_{LP}|=\\frac{1}{\\sqrt{1+(f\u002Ff_c)^2}}\u003C\u002Fp>\u003Cp>]\u003C\u002Fp>\u003Cp>For the high-pass filter:\u003C\u002Fp>\u003Cp>[\u003C\u002Fp>\u003Cp>|H_{HP}|=\\frac{f\u002Ff_c}{\\sqrt{1+(f\u002Ff_c)^2}}\u003C\u002Fp>\u003Cp>]\u003C\u002Fp>\u003Cp>The ideal unloaded results are:\u003C\u002Fp>\u003Ctable>\u003Ctbody>\u003Ctr>\u003Ctd>Input frequency\u003C\u002Ftd>\u003Ctd>Low-pass output\u003C\u002Ftd>\u003Ctd>High-pass output\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>50 Hz\u003C\u002Ftd>\u003Ctd>0.995 (V_{in}), −0.05 dB\u003C\u002Ftd>\u003Ctd>0.103 (V_{in}), −19.7 dB\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>482 Hz\u003C\u002Ftd>\u003Ctd>0.707 (V_{in}), −3.01 dB\u003C\u002Ftd>\u003Ctd>0.707 (V_{in}), −3.01 dB\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>5 kHz\u003C\u002Ftd>\u003Ctd>0.096 (V_{in}), −20.4 dB\u003C\u002Ftd>\u003Ctd>0.995 (V_{in}), −0.04 dB\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Cp>The table demonstrates why “passes” and “blocks” should not be interpreted as absolute conditions. The unwanted frequency remains present but is reduced according to the frequency ratio and filter order.\u003C\u002Fp>\u003Ch2>Transfer Functions and Bode Plots\u003C\u002Fh2>\u003Cp>Using the Laplace variable (s), the transfer function of a first-order RC low-pass filter is:\u003C\u002Fp>\u003Cp>[\u003C\u002Fp>\u003Cp>H_{LP}(s)=\\frac{1}{1+sRC}\u003C\u002Fp>\u003Cp>]\u003C\u002Fp>\u003Cp>For a first-order RC high-pass filter:\u003C\u002Fp>\u003Cp>[\u003C\u002Fp>\u003Cp>H_{HP}(s)=\\frac{sRC}{1+sRC}\u003C\u002Fp>\u003Cp>]\u003C\u002Fp>\u003Cp>These equations describe three important operating regions.\u003C\u002Fp>\u003Ctable>\u003Ctbody>\u003Ctr>\u003Ctd>Frequency region\u003C\u002Ftd>\u003Ctd>Low-pass response\u003C\u002Ftd>\u003Ctd>High-pass response\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>(f\\ll f_c)\u003C\u002Ftd>\u003Ctd>Gain approaches 1\u003C\u002Ftd>\u003Ctd>Gain approaches 0\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>(f=f_c)\u003C\u002Ftd>\u003Ctd>−3 dB, phase approximately −45°\u003C\u002Ftd>\u003Ctd>−3 dB, phase approximately +45°\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>(f\\gg f_c)\u003C\u002Ftd>\u003Ctd>Gain approaches 0\u003C\u002Ftd>\u003Ctd>Gain approaches 1\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Cp>On a logarithmic Bode magnitude plot, the low-pass response begins near 0 dB and turns downward after the corner. The high-pass response rises from strong low-frequency attenuation and approaches 0 dB above the corner.\u003C\u002Fp>\u003Cp>For a first-order section, the asymptotic roll-off is 20 dB per decade, equivalent to approximately 6 dB per octave. Analog Devices notes that each pole contributes about −20 dB\u002Fdecade, while a zero contributes approximately +20 dB\u002Fdecade. \u003C\u002Fp>\u003Ch2>Filter Order and Roll-Off Rate\u003C\u002Fh2>\u003Cp>A higher-order filter can produce greater stopband attenuation without moving the cutoff unnecessarily far from the wanted signal.\u003C\u002Fp>\u003Ctable>\u003Ctbody>\u003Ctr>\u003Ctd>Filter order\u003C\u002Ftd>\u003Ctd>Approximate ultimate roll-off\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>First order\u003C\u002Ftd>\u003Ctd>20 dB\u002Fdecade or 6 dB\u002Foctave\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Second order\u003C\u002Ftd>\u003Ctd>40 dB\u002Fdecade or 12 dB\u002Foctave\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Third order\u003C\u002Ftd>\u003Ctd>60 dB\u002Fdecade or 18 dB\u002Foctave\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Fourth order\u003C\u002Ftd>\u003Ctd>80 dB\u002Fdecade or 24 dB\u002Foctave\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Cp>These values describe the eventual slope, not necessarily the attenuation immediately beside the cutoff.\u003C\u002Fp>\u003Cp>Higher-order filters can be constructed by cascading first- and second-order stages. However, directly connecting passive RC stages may cause loading, so the result is not always equivalent to multiplying two ideal independent responses. Buffers or a properly calculated active topology may be required.\u003C\u002Fp>\u003Cp>Common response families include:\u003C\u002Fp>\u003Col>\u003Cli>\u003Cstrong>Butterworth:\u003C\u002Fstrong> Maximally flat magnitude response in the passband, with moderate transition sharpness.\u003C\u002Fli>\u003Cli>\u003Cstrong>Bessel:\u003C\u002Fstrong> Prioritizes nearly constant group delay and clean transient response, but rolls off more gradually.\u003C\u002Fli>\u003Cli>\u003Cstrong>Chebyshev:\u003C\u002Fstrong> Accepts passband ripple to obtain a sharper transition and greater near-cutoff attenuation.\u003C\u002Fli>\u003C\u002Fol>\u003Cp>Texas Instruments’ active-filter guidance describes the same trade-off: Butterworth provides strong all-around performance, Bessel minimizes pulse distortion, and Chebyshev provides faster attenuation at the cost of ripple, overshoot and ringing. \u003C\u002Fp>\u003Ch2>Passive vs Active Filters\u003C\u002Fh2>\u003Cp>Both low-pass and high-pass responses can be implemented as passive or active filters.\u003C\u002Fp>\u003Ctable>\u003Ctbody>\u003Ctr>\u003Ctd>Factor\u003C\u002Ftd>\u003Ctd>Passive filter\u003C\u002Ftd>\u003Ctd>Active filter\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Components\u003C\u002Ftd>\u003Ctd>Resistors, capacitors and\u002For inductors\u003C\u002Ftd>\u003Ctd>Op-amp plus resistors and capacitors\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Power gain\u003C\u002Ftd>\u003Ctd>Cannot provide gain\u003C\u002Ftd>\u003Ctd>Can provide voltage gain\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Buffering\u003C\u002Ftd>\u003Ctd>Not inherent\u003C\u002Ftd>\u003Ctd>Can provide low output impedance\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>External supply\u003C\u002Ftd>\u003Ctd>Not required\u003C\u002Ftd>\u003Ctd>Required\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Loading sensitivity\u003C\u002Ftd>\u003Ctd>Usually higher\u003C\u002Ftd>\u003Ctd>Usually lower\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Frequency range\u003C\u002Ftd>\u003Ctd>Suitable from low frequencies through RF, depending on topology\u003C\u002Ftd>\u003Ctd>Limited by amplifier bandwidth and other non-ideal behavior\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Typical uses\u003C\u002Ftd>\u003Ctd>Simple RC filtering, RF networks, power filtering\u003C\u002Ftd>\u003Ctd>Audio, sensor conditioning, ADC drivers\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Cp>An active filter is not automatically better. At low and moderate frequencies, it can provide gain, buffering and accurate higher-order responses without inductors. At RF frequencies, passive LC, transmission-line, ceramic, SAW or other specialized filters may be more appropriate.\u003C\u002Fp>\u003Cp>Active-filter performance also depends on op-amp gain bandwidth, open-loop gain, slew rate, noise, output drive, supply voltage and input\u002Foutput range.\u003C\u002Fp>\u003Ch2>How to Choose Between a Low-Pass and High-Pass Filter\u003C\u002Fh2>\u003Cp>Start by identifying the frequency components that must be retained.\u003C\u002Fp>\u003Ctable>\u003Ctbody>\u003Ctr>\u003Ctd>Design goal\u003C\u002Ftd>\u003Ctd>Recommended response\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Remove high-frequency sensor noise\u003C\u002Ftd>\u003Ctd>Low-pass\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Reduce aliasing before an ADC\u003C\u002Ftd>\u003Ctd>Low-pass\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Convert PWM to a smoother voltage\u003C\u002Ftd>\u003Ctd>Low-pass\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Remove a DC offset\u003C\u002Ftd>\u003Ctd>High-pass\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>AC-couple amplifier stages\u003C\u002Ftd>\u003Ctd>High-pass\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Suppress slow baseline drift\u003C\u002Ftd>\u003Ctd>High-pass\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Route bass to a woofer\u003C\u002Ftd>\u003Ctd>Low-pass\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Route treble to a tweeter\u003C\u002Ftd>\u003Ctd>High-pass\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Preserve only a middle frequency range\u003C\u002Ftd>\u003Ctd>High-pass followed by low-pass, forming a band-pass response\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Cp>After selecting the response type, define:\u003C\u002Fp>\u003Col>\u003Cli>Highest and lowest wanted frequencies\u003C\u002Fli>\u003Cli>Maximum acceptable passband loss\u003C\u002Fli>\u003Cli>Frequency at which stopband attenuation is required\u003C\u002Fli>\u003Cli>Required attenuation at that frequency\u003C\u002Fli>\u003Cli>Acceptable phase shift, delay and transient distortion\u003C\u002Fli>\u003C\u002Fol>\u003Cp>This approach is more reliable than choosing a cutoff frequency before defining the passband and stopband requirements.\u003C\u002Fp>\u003Ch2>Practical RC Filter Design Considerations\u003C\u002Fh2>\u003Ch3>Source and Load Impedance\u003C\u002Fh3>\u003Cp>For a low-pass filter, source resistance adds to the intended series resistance. A finite load also changes the voltage division and effective pole. Analyze the complete circuit using the source’s Thevenin resistance and the receiving stage’s input impedance.\u003C\u002Fp>\u003Cp>As a practical first check, keeping the load impedance at least ten times greater than the filter’s relevant resistance reduces—but does not eliminate—loading error. Analog Devices similarly treats a high load impedance as an assumption behind the simplest passive RC analysis. \u003C\u002Fp>\u003Ch3>Component Tolerance and Temperature\u003C\u002Fh3>\u003Cp>Resistor and capacitor tolerances shift the real cutoff frequency. Temperature coefficient, aging and capacitor voltage dependence can introduce further error.\u003C\u002Fp>\u003Cp>C0G\u002FNP0 ceramic capacitors are useful where stability and linearity matter. Higher-capacitance ceramic dielectrics such as X7R can be appropriate in less critical circuits, but their effective capacitance may change with DC bias, package size and temperature.\u003C\u002Fp>\u003Ch3>Parasitic Effects\u003C\u002Fh3>\u003Cp>Very high resistance combined with a very small capacitor makes the circuit more sensitive to PCB leakage, input capacitance and stray capacitance. Very low resistance increases current demand and can load the source unnecessarily.\u003C\u002Fp>\u003Cp>Texas Instruments recommends selecting values with practical parasitics, tolerance and power trade-offs in mind rather than treating every mathematically valid R\u002FC combination as equivalent. \u003C\u002Fp>\u003Ch3>ADC Inputs\u003C\u002Fh3>\u003Cp>Many ADC inputs are not equivalent to a constant high resistance. Switched-capacitor input structures can draw brief charge pulses during acquisition. The filter must therefore be checked against acquisition time, input settling and driver stability.\u003C\u002Fp>\u003Cp>A buffer can reduce the loading of a passive section and provide lower output impedance, but the amplifier and local RC network must follow the ADC manufacturer’s recommendations.\u003C\u002Fp>\u003Ch3>RF and High-Speed Circuits\u003C\u002Fh3>\u003Cp>At high frequencies, capacitor ESR and ESL, resistor parasitics, package dimensions, \u003Ca href=\\\"http:\u002F\u002Fmozpcb.com\u002F\\\" rel=\\\"noopener noreferrer\\\" target=\\\"_blank\\\">PCB\u003C\u002Fa> traces, grounding and impedance matching may dominate the result. An ideal low-frequency RC equation is not sufficient for designing a precision RF filter.\u003C\u002Fp>\u003Ch2>Common Filter Design Mistakes\u003C\u002Fh2>\u003Cp>Avoid these frequent errors:\u003C\u002Fp>\u003Col>\u003Cli>Treating the cutoff frequency as an on\u002Foff boundary\u003C\u002Fli>\u003Cli>Assuming “high-pass” means removing high frequencies\u003C\u002Fli>\u003Cli>Ignoring the location of the output node\u003C\u002Fli>\u003Cli>Selecting (f_c) without defining stopband attenuation\u003C\u002Fli>\u003Cli>Cascading passive stages without calculating loading\u003C\u002Fli>\u003Cli>Ignoring resistor and capacitor tolerance\u003C\u002Fli>\u003Cli>Using an op-amp with insufficient bandwidth or slew rate\u003C\u002Fli>\u003Cli>Assuming every bypass capacitor forms a complete low-pass filter\u003C\u002Fli>\u003Cli>Applying an ideal RC model directly to RF layouts\u003C\u002Fli>\u003C\u002Fol>\u003Ch2>Frequently Asked Questions\u003C\u002Fh2>\u003Ch3>What is the main difference between a low-pass and high-pass filter?\u003C\u002Fh3>\u003Cp>A low-pass filter retains frequencies below its cutoff and attenuates higher frequencies. A high-pass filter retains frequencies above the cutoff and attenuates lower frequencies.\u003C\u002Fp>\u003Ch3>Is a high-pass filter the same as a low-cut filter?\u003C\u002Fh3>\u003Cp>Yes. “High-pass” describes the frequencies being retained, while “low-cut” describes the frequencies being reduced.\u003C\u002Fp>\u003Ch3>Is a low-pass filter the same as a high-cut filter?\u003C\u002Fh3>\u003Cp>Yes. Both terms refer to a filter that attenuates higher-frequency components.\u003C\u002Fp>\u003Ch3>What happens at the cutoff frequency?\u003C\u002Fh3>\u003Cp>For a first-order RC filter, the output magnitude is approximately 70.7% of its passband level, equal to −3.01 dB. The signal is attenuated, not completely blocked.\u003C\u002Fp>\u003Ch3>Does a low-pass filter pass DC?\u003C\u002Fh3>\u003Cp>A basic RC low-pass filter passes DC because the capacitor behaves as an open circuit after steady state is reached. The exact DC gain still depends on source and load resistance.\u003C\u002Fp>\u003Ch3>Does a high-pass filter block DC?\u003C\u002Fh3>\u003Cp>Yes. The series capacitor in a basic high-pass filter prevents a steady-state DC component from reaching the output.\u003C\u002Fp>\u003Ch3>Can low-pass and high-pass filters use the same R and C values?\u003C\u002Fh3>\u003Cp>Yes. They will have the same ideal cutoff frequency, but the component arrangement and output measurement point determine whether the response is low-pass or high-pass.\u003C\u002Fp>\u003Ch3>Can low-pass and high-pass filters be combined?\u003C\u002Fh3>\u003Cp>Yes. A high-pass section with a lower cutoff and a low-pass section with a higher cutoff can form a band-pass filter. Stage interaction and loading must be included in the design.\u003C\u002Fp>\u003Ch3>What is the difference between first-order and second-order filters?\u003C\u002Fh3>\u003Cp>A first-order filter contains one pole and eventually rolls off at 20 dB\u002Fdecade. A second-order filter contains two poles and can reach 40 dB\u002Fdecade, although its behavior near cutoff also depends on damping and Q.\u003C\u002Fp>\u003Ch3>Which filter removes electrical noise?\u003C\u002Fh3>\u003Cp>It depends on the noise spectrum. Use a low-pass filter when unwanted noise lies above the wanted signal band. Use a high-pass filter when the interference is DC or lower in frequency than the wanted signal. Narrowband interference may require a notch or band-stop filter instead.\u003C\u002Fp>\u003Ch2>Conclusion\u003C\u002Fh2>\u003Cp>The choice between a low-pass and high-pass filter begins with one question: which part of the frequency spectrum contains the useful information?\u003C\u002Fp>\u003Cp>A low-pass filter is appropriate when low-frequency or slowly changing content must be preserved. A high-pass filter is appropriate when DC and slow changes must be removed while faster signal components are retained.\u003C\u002Fp>\u003Cp>The equation (f_c=1\u002F(2\\pi RC)) provides a useful starting point, but a reliable design must also consider required stopband attenuation, source and load impedance, component tolerance, filter order, phase response and circuit non-idealities. For demanding ADC, audio, industrial and RF systems, these practical factors often determine whether a filter works only in calculation or also performs correctly in hardware.\u003C\u002Fp>","\u002Fprofile\u002Fupload\u002Fblog\u002Ftechnical-knowledge\u002Fcover.webp","Octatronics","1","0","Low-Pass vs High-Pass Filter: Key Differences","Compare low-pass vs high-pass filters by frequency response, RC circuit, cutoff formula, Bode plot, applications, filter order, and practical design considerations.","2026-07-27T14:43:05.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":98,"slug":99,"orderNum":15,"delFlag":15},"Technical Knowledge","technical-knowledge",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":66,"name":101,"avatar":102,"role":103,"expertise":104,"intro":105,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},"Sarah Miller","\u002Fprofile\u002Fupload\u002F2026\u002F05\u002F03\u002Fsarah-miller_20260503222700A004.jpg","Hardware Design & Applications Writer","Circuit applications, embedded systems, sensors, power management, interface ICs","Sarah Miller is a hardware design and applications writer specializing in practical circuit use cases, embedded systems, sensors, power management, and interface components. She focuses on explaining how electronic components are used in real products and industrial systems.\n\nHer content covers application notes, design considerations, component comparison, common circuit functions, and system-level integration. Sarah aims to help engineers quickly understand where a component fits, what parameters matter, and how to evaluate alternatives during the design process.","admin","2026-07-27T06:43:04.000+08:00","2026-07-27T07:15:43.000+08:00",[110,111],28,63,[113,114],1,78,[],[117,128,141,153,164,174,186,195],{"id":110,"title":118,"slug":119,"summary":120,"content":15,"coverImage":121,"category":15,"tags":15,"author":91,"viewCount":122,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":123,"categoryId":39,"authorId":39,"articleCategory":124,"articleAuthor":125,"delFlag":15,"createBy":15,"createTime":123,"updateBy":15,"updateTime":15,"productCategoryIds":15,"manufacturerIds":15,"applicationIds":15},"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",53,"2026-06-28T12:59:46.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":98,"slug":99,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":126,"avatar":127,"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":55,"title":129,"slug":130,"summary":131,"content":15,"coverImage":132,"category":98,"tags":133,"author":134,"viewCount":135,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":136,"categoryId":39,"authorId":55,"articleCategory":137,"articleAuthor":138,"delFlag":15,"createBy":15,"createTime":140,"updateBy":15,"updateTime":15,"productCategoryIds":15,"manufacturerIds":15,"applicationIds":15},"What Is an Integrated Circuit? Types, Functions, and Common Applications","what-is-an-integrated-circuit","Learn what an integrated circuit is, how ICs differ from discrete circuits, the major IC types, common applications, package considerations, and how engineers and buyers evaluate ICs.","\u002Fprofile\u002Fupload\u002Fblog\u002F2026\u002F06\u002F14\u002Fwhat-is-an-integrated-circuit-cover.webp","integrated circuit, IC basics, semiconductor IC, analog IC, digital IC, mixed-signal IC","Michael Anderson",62,"2026-05-23T10:00:00.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":98,"slug":99,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":55,"name":134,"avatar":139,"role":15,"expertise":15,"intro":15,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},"\u002Fprofile\u002Fupload\u002F2026\u002F05\u002F03\u002Fmichael-anderson_20260503222635A003.jpg","2026-05-24T07:20:27.000+08:00",{"id":142,"title":143,"slug":144,"summary":145,"content":15,"coverImage":146,"category":15,"tags":15,"author":91,"viewCount":147,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":148,"categoryId":39,"authorId":113,"articleCategory":149,"articleAuthor":150,"delFlag":15,"createBy":15,"createTime":148,"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",57,"2026-06-28T22:54:31.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":98,"slug":99,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":113,"name":151,"avatar":152,"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":154,"title":155,"slug":156,"summary":157,"content":15,"coverImage":158,"category":15,"tags":15,"author":91,"viewCount":159,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":160,"categoryId":39,"authorId":113,"articleCategory":161,"articleAuthor":162,"delFlag":15,"createBy":15,"createTime":163,"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",103,"2026-07-07T07:15:34.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":98,"slug":99,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":113,"name":151,"avatar":152,"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":165,"title":166,"slug":167,"summary":168,"content":15,"coverImage":15,"category":15,"tags":15,"author":91,"viewCount":169,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":170,"categoryId":39,"authorId":66,"articleCategory":171,"articleAuthor":172,"delFlag":15,"createBy":15,"createTime":173,"updateBy":15,"updateTime":15,"productCategoryIds":15,"manufacturerIds":15,"applicationIds":15},38,"RF Transceiver vs RF Module vs RF Switch: What Is the Difference?","rf-transceiver-vs-rf-module-vs-rf-switch","Compare RF transceivers, RF modules, and RF switches. Learn what each part does, how they work together, and which one your wireless design needs.",15,"2026-07-21T21:15:52.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":98,"slug":99,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":66,"name":101,"avatar":102,"role":15,"expertise":15,"intro":15,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},"2026-07-21T13:15:51.000+08:00",{"id":175,"title":176,"slug":177,"summary":178,"content":15,"coverImage":179,"category":98,"tags":180,"author":134,"viewCount":181,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":182,"categoryId":39,"authorId":55,"articleCategory":183,"articleAuthor":184,"delFlag":15,"createBy":15,"createTime":185,"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",14,"2026-08-06T10:00:00.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":98,"slug":99,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":55,"name":134,"avatar":139,"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":39,"title":187,"slug":188,"summary":189,"content":15,"coverImage":190,"category":15,"tags":15,"author":91,"viewCount":191,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":192,"categoryId":39,"authorId":113,"articleCategory":193,"articleAuthor":194,"delFlag":15,"createBy":15,"createTime":192,"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",256,"2026-05-03T17:59:06.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":98,"slug":99,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":113,"name":151,"avatar":152,"role":15,"expertise":15,"intro":15,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},{"id":196,"title":197,"slug":198,"summary":199,"content":15,"coverImage":200,"category":15,"tags":15,"author":91,"viewCount":201,"isPublished":92,"isTop":93,"seoTitle":15,"seoDesc":15,"seoKeywords":15,"faqJson":15,"publishTime":202,"categoryId":39,"authorId":55,"articleCategory":203,"articleAuthor":204,"delFlag":15,"createBy":15,"createTime":202,"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",61,"2026-06-24T06:56:22.000+08:00",{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":39,"name":98,"slug":99,"orderNum":15,"delFlag":15},{"createBy":15,"createTime":15,"updateBy":15,"updateTime":15,"remark":15,"id":55,"name":134,"avatar":139,"role":15,"expertise":15,"intro":15,"facebook":15,"youtube":15,"linkedin":15,"twitter":15,"delFlag":15},[206,212,216,222,228],{"createBy":106,"createTime":207,"updateBy":106,"updateTime":208,"remark":209,"id":55,"name":210,"slug":211,"orderNum":113,"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":106,"createTime":213,"updateBy":106,"updateTime":214,"remark":215,"id":39,"name":98,"slug":99,"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":106,"createTime":217,"updateBy":106,"updateTime":218,"remark":219,"id":113,"name":220,"slug":221,"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":106,"createTime":223,"updateBy":106,"updateTime":224,"remark":225,"id":66,"name":226,"slug":227,"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":106,"createTime":229,"updateBy":106,"updateTime":230,"remark":231,"id":232,"name":233,"slug":234,"orderNum":232,"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",[236,245,254,263,270,275,279,285,292,296],{"id":237,"mpn":238,"title":-1,"manufacturer":239,"manufacturerSlug":240,"categoryName":241,"categorySlug":242,"categorySlugPath":243,"shortDesc":-1,"coverImageUrl":-1,"slug":244},199603,"ADM6918XABT1","Infineon Technologies","infineon-technologies","Controllers","interface-controllers","integrated-circuits-ics\u002Finterface-ics\u002Finterface-controllers","infineon-technologies-adm6918xabt1",{"id":246,"mpn":247,"title":-1,"manufacturer":248,"manufacturerSlug":249,"categoryName":250,"categorySlug":251,"categorySlugPath":252,"shortDesc":-1,"coverImageUrl":-1,"slug":253},197449,"PS393ESE","Diodes Incorporated","diodes-incorporated","Analog Switches, Multiplexers and 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