SN74AHCT TTL-Compatible CMOS Logic Variants

Texas Instruments SN74AHCT devices combine Advanced High-Speed CMOS outputs with TTL-compatible inputs for 5 V gates, buffers, registers, and bus-interface logic.

Input compatibility

Designed for 5 V systems that receive TTL-level signals.

Output technology

Can reduce static current compared with bipolar TTL devices.

Use case

Often considered when updating LS or HCT logic paths.

Fast CMOS logic for TTL-input 5 V systems

Compare SN74AHCT variants where TTL input thresholds and CMOS speed both matter.

The SN74AHCT family is the TTL-input counterpart to TI's AHC logic line. It is commonly selected when a board runs from a 5 V rail and receives input signals from TTL or LS-type outputs, but the designer wants CMOS-style lower static power and faster AHC-class switching. The family includes common gates, inverters, buffers, latches, flip-flops, and bus devices across SOIC, TSSOP, SSOP, PDIP, and compact packages.

SN74AHCT parts are especially useful in modernization work: they can interface more naturally with older TTL-level signals than AHC devices while offering a practical path toward lower-power CMOS logic. They still require exact electrical review. Check the input thresholds, supply range, propagation delay, output drive, output-enable behavior, package pinout, and whether the circuit depends on bipolar TTL input loading.

Key Features

TTL-compatible inputs for 5 V systems
Faster CMOS behavior than many older HCT functions
Useful bridge between LS TTL outputs and CMOS logic stages
Covers standard gates, inverters, buffers, and bus functions
Good candidate for legacy redesign when timing and loading are checked

Target Applications

5 V TTL system refreshes
Industrial controls with mixed TTL and CMOS logic
Bus buffering and decode logic
Maintenance of older digital boards
Test fixtures and interface adapters

Ordering Variants

Compare 225 SN74AHCT 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
SN74AHCT125D	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Channels: 4 \| Number of Outputs: 4 \| Number of Bits: 4 \| Logic Function: Buffer, Inverting	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT16374DGVR	Package: TFSOP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Outputs: 16 \| Number of Bits: 16 \| Frequency: 130MHz \| Logic Function: D-Type, Flip-Flop	TFSOP	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT16374DL	Package: SSOP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 8mA \| Number of Outputs: 16 \| Number of Bits: 16 \| Frequency: 75MHz	SSOP	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT1G125DBVR	Package: SOT-23 \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Channels: 1 \| Number of Outputs: 1 \| Number of Bits: 1 \| Logic Function: Buffer, Inverting	SOT-23	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT1G125DCKT	Package: SC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Channels: 1 \| Number of Outputs: 1 \| Number of Bits: 1 \| Logic Function: Buffer, Inverting	SC	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT574N	Package: PDIP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 8mA \| Number of Outputs: 8 \| Number of Bits: 8 \| Frequency: 115MHz	PDIP	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT273DBR	Package: SSOP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Outputs: 8 \| Number of Bits: 8 \| Frequency: 45MHz \| Max Frequency: 45MHz	SSOP	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT273DW	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 8mA \| Number of Outputs: 8 \| Number of Bits: 8 \| Frequency: 45MHz	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT273NSR	Package: SOP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Outputs: 8 \| Number of Bits: 8 \| Frequency: 45MHz \| Max Frequency: 45MHz	SOP	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT00D	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 8mA \| Number of Outputs: 1 \| Number of Bits: 4 \| Logic Function: NAND GATE	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT1G02DBVR	Package: SOT-23 \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 25mA \| Number of Outputs: 1 \| Number of Bits: 1 \| Logic Function: NOR GATE	SOT-23	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT1G08DBVT	Package: SOT-23 \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 8mA \| Number of Outputs: 1 \| Number of Bits: 1 \| Logic Function: AND GATE	SOT-23	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT1G14DCKR	Package: SC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 25mA \| Number of Channels: 1 \| Number of Outputs: 1 \| Number of Bits: 1	SC	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT1G86DBVR	Package: SOT-23 \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 8A \| Number of Channels: 1 \| Number of Outputs: 1 \| Number of Bits: 1	SOT-23	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT32D	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 8mA \| Number of Outputs: 1 \| Number of Bits: 4 \| Logic Function: OR GATE	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT32PWR	Package: TSSOP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 8mA \| Number of Outputs: 1 \| Number of Bits: 4 \| Logic Function: OR GATE	TSSOP	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT86D	Package: SOIC \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 8mA \| Number of Outputs: 1 \| Number of Bits: 4 \| Logic Function: XOR GATE, OR GATE	SOIC	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT86RGYR	Package: VQFN \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Output Current: 8mA \| Number of Outputs: 1 \| Number of Bits: 4 \| Logic Function: XOR GATE, OR GATE	VQFN	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT595N	Package: PDIP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Bits: 8 \| Logic Function: Shift Register \| Max Operating Temp: 85°C \| Min Operating Temp: -40°C	PDIP	Texas Instruments	Active	Compliant	In Stock	RFQ
SN74AHCT595PWRG4	Package: TSSOP \| Operating Supply Voltage: 5V \| Max Supply Voltage: 5.5V \| Min Supply Voltage: 4.5V \| Number of Bits: 8 \| Logic Function: Shift Register \| Max Operating Temp: 85°C \| Min Operating Temp: -40°C	TSSOP	Texas Instruments	Active	Compliant	In Stock	RFQ

Ordering Code Differences

How suffixes on SN74AHCT map to package, grade, and reel options.

[{"code":"AHCT","meaning":"TTL-compatible input threshold version of the AHC family."},{"code":"SN74AHCT00 / 02 / 04 / 08","meaning":"Common gates and inverter functions used in 5 V logic paths."},{"code":"SN74AHCT244 / 245 / 541","meaning":"Bus buffer or transceiver functions with output-enable behavior."},{"code":"D, DB, PW, N suffixes","meaning":"Package and packing indicators; verify package drawings before substitution."}]

How to Choose the Right SN74AHCT Buffers, Drivers, Receivers and Transceivers

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Use for TTL inputs

AHCT is the better fit than AHC when a 5 V CMOS device must recognize TTL-level highs and lows.

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Review legacy loading

Replacing bipolar TTL with AHCT can change input loading and edge behavior.

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Check timing both ways

Propagation delay, output drive, and load capacitance determine whether a drop-in replacement is safe.

Technical Specifications

Core parameters for SN74AHCT product family

Logic family

Advanced High-Speed CMOS with TTL-compatible inputs

Nominal supply

5 V class, often 4.5 V to 5.5 V

Input behavior

TTL-compatible thresholds

Common packages

SOIC, TSSOP, SSOP, PDIP, VQFN

Typical role

TTL-to-CMOS modernization and 5 V logic functions

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Frequently Asked Questions

Common technical questions about the SN74AHCT product family.

When should I choose SN74AHCT instead of SN74AHC?

Choose AHCT when the input signal is TTL-level on a 5 V system. Choose AHC when the driving signal uses CMOS thresholds.

Can AHCT replace LS TTL?

Sometimes, but input loading, output drive, timing, fanout, and output topology must be checked. It is not automatic.

Does SN74AHCT operate at 3.3 V?

AHCT devices are generally intended for 5 V TTL-compatible operation. Check the exact datasheet before using them at other supply voltages.

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