CD74HCT TTL-Compatible CMOS Logic Variants

Texas Instruments CD74HCT devices are 5 V high-speed CMOS logic parts with TTL-compatible inputs for gates, inverters, flip-flops, counters, and interface logic.

Input class

Designed for 5 V systems driven by TTL-level signals.

Logic technology

Can reduce static power compared with bipolar TTL logic.

Function breadth

Includes gates, sequential logic, counters, and decoders.

TTL-input CMOS logic for 5 V digital boards

Compare CD74HCT variants by logic function, package, timing, input compatibility, and temperature grade.

The CD74HCT family combines 74HC-style CMOS outputs with TTL-compatible input thresholds for 5 V systems. It is often used where a design receives signals from LS, ALS, or other TTL outputs but wants CMOS logic behavior and lower static power. Functions include gates, inverters, flip-flops, counters, decoders, multiplexers, and other standard 74-series building blocks.

CD74HCT variants are common in industrial equipment, test fixtures, and legacy modernization projects. They are not the same as CD74HC: HCT input thresholds are designed around TTL logic levels, while HC expects CMOS-level inputs. Before replacing a part, compare function, pinout, propagation delay, output drive, load capacitance, supply range, temperature grade, and package suffix.

Key Features

TTL-compatible inputs for 5 V logic systems
CMOS output behavior with low static input current
Broad standard 74-series function coverage
Useful for LS/ALS modernization when loading is reviewed
DIP and SMT packages support service and production boards

Target Applications

5 V logic modernization
Industrial control boards
Test fixtures and adapters
Counter and decoder circuits
TTL-output to CMOS-input interface paths

Ordering Variants

Compare 150 CD74HCT part numbers by package, electrical parameters, lifecycle, and availability. Use RFQ for stock and lead-time confirmation.

Part Number	Description	Package Type	Manufacturer	Lifecycle	RoHS	Availability	Action
CD74HCT243M	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Channels: 4 \| Number of Bits: 4 \| Logic Function: Transceiver, Inverting \| Max Operating Temp: 125°C	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT368M	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Channels: 6 \| Number of Outputs: 6 \| Number of Bits: 6 \| Logic Function: Buffer, Inverter	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT373M	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 6mA \| Number of Channels: 8 \| Number of Bits: 8 \| Logic Function: D-Type, Latch	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT374M	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 6mA \| Number of Bits: 8 \| Frequency: 60MHz \| Max Frequency: 20MHz	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT533E	Package: PDIP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 6mA \| Number of Bits: 8 \| Logic Function: D-Type, Latch \| Max Operating Temp: 125°C	PDIP	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT564MG4	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Bits: 8 \| Frequency: 50MHz \| Logic Function: D-Type, Flip-Flop \| Max Operating Temp: 125°C	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT574M96G4	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Outputs: 8 \| Number of Bits: 8 \| Frequency: 60MHz \| Logic Function: D-Type, Flip-Flop	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT163EE4	Package: PDIP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Bits: 4 \| Frequency: 30MHz \| Logic Function: Counter \| Max Operating Temp: 125°C	PDIP	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT163MT	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Bits: 4 \| Frequency: 30MHz \| Max Frequency: 30MHz \| Logic Function: Counter	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT191E	Package: PDIP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Bits: 4 \| Frequency: 30MHz \| Logic Function: Counter \| Max Operating Temp: 125°C	PDIP	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT390M	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Bits: 4 \| Frequency: 27MHz \| Logic Function: Counter \| Max Operating Temp: 125°C	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT393E	Package: DIP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Voltage: 6V \| Number of Bits: 4 \| Frequency: 27MHz \| Logic Function: Counter	DIP	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT393MT	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Bits: 4 \| Frequency: 27MHz \| Max Frequency: 27MHz \| Logic Function: Counter	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT40103E	Package: PDIP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Bits: 8 \| Frequency: 25MHz \| Logic Function: Counter \| Max Operating Temp: 125°C	PDIP	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT4020M96	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Bits: 14 \| Frequency: 25MHz \| Max Frequency: 25MHz \| Logic Function: Counter	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT4040M96	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Bits: 12 \| Frequency: 25MHz \| Logic Function: Counter \| Max Operating Temp: 125°C	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT423M96G4	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 4mA \| Number of Bits: 2 \| Logic Function: Multivibrator \| Max Operating Temp: 125°C	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT4520M	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Bits: 4 \| Frequency: 50MHz \| Logic Function: Counter \| Max Operating Temp: 125°C	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT112E	Package: PDIP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 4mA \| Number of Bits: 2 \| Frequency: 60MHz \| Max Frequency: 20MHz	PDIP	Texas Instruments	Active	Compliant	In Stock	RFQ
CD74HCT273EE4	Package: PDIP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Bits: 8 \| Frequency: 50MHz \| Logic Function: D-Type, Flip-Flop \| Max Operating Temp: 125°C	PDIP	Texas Instruments	Active	Compliant	In Stock	RFQ

Ordering Code Differences

How suffixes on CD74HCT map to package, grade, and reel options.

[{"code":"CD74HCT00 / 02 / 04 / 08","meaning":"Common gate and inverter functions with TTL-compatible inputs."},{"code":"CD74HCT74 / 138 / 595","meaning":"Representative flip-flop, decoder, and shift-register functions."},{"code":"HCT vs HC","meaning":"HCT accepts TTL-level inputs; HC expects CMOS thresholds."},{"code":"E, M, PW, NS suffixes","meaning":"Package and packing indicators that must match board layout."}]

How to Choose the Right CD74HCT Buffers, Drivers, Receivers and Transceivers

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Use HCT for TTL inputs

Choose HCT when the previous stage cannot guarantee CMOS-level high voltage.

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Check old TTL loading

CMOS inputs load the previous stage differently than bipolar TTL inputs.

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Review timing paths

Counters and asynchronous logic may depend on propagation delay and edge behavior.

Technical Specifications

Core parameters for CD74HCT product family

Logic family

HCT CMOS with TTL-compatible inputs

Nominal supply

5 V class

Input behavior

TTL-compatible thresholds

Common packages

PDIP, SOIC, TSSOP

Typical role

TTL-to-CMOS compatible standard logic

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Frequently Asked Questions

Common technical questions about the CD74HCT product family.

What is the difference between CD74HC and CD74HCT?

CD74HCT uses TTL-compatible input thresholds at 5 V, while CD74HC uses CMOS input thresholds.

Can CD74HCT replace 74LS logic?

Sometimes, but loading, output drive, timing, output topology, and pinout must be checked.

Is CD74HCT suitable for 3.3 V systems?

HCT is generally intended for 5 V TTL-compatible use. Check the exact datasheet before using it at lower rails.

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