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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

Texas Instruments SN74AHCT374DW

Name: SN74AHCT374DW
Brand: Texas Instruments
SKU: SN74AHCT374DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AHCT374DW

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: SN74AHCT374DW.pdf

Description:: IC FF D-TYPE SNGL 8BIT 20SOIC

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Product details

Overview

SN74AHCT374DW from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for synchronous data latching and bus interface in 5V digital systems. It operates from 4.5V to 5.5V V_CC, delivers 10.5ns propagation delay at 5V/15pF, supports up to 80MHz clock frequency, and features TTL-compatible inputs for seamless legacy logic interfacing - used in parallel data synchronization and bidirectional bus driving.

For engineers reviewing the SN74AHCT374DW datasheet, SN74AHCT374DW pinout, SN74AHCT374DW application, or SN74AHCT374DW equivalent, this page provides verified functional identity, SOIC-20 package mapping, confirmed timing parameters (t_PLH/t_PHL = 10.5ns), 3-state output behavior, and real-world selection guidance against comparable octal D-flip-flops.

Technical Context

The SN74AHCT374DW implements eight independent D-type flip-flops sharing a single rising-edge-triggered CLK input and a common active-low OE control signal. Its flow-through pinout minimizes PCB trace crossovers in bus-oriented layouts. All outputs are CMOS-based 3-state drivers capable of sourcing/sinking ±25mA while maintaining TTL-compatible input thresholds (V_IL = 0.8V, V_VIH = 2.0V at V_CC = 4.5–5.5V).

It uses balanced CMOS output stages enabling high-impedance state entry without affecting internal latch operation - allowing data retention or update during bus release. Latch-up immunity exceeds 250mA per JESD17, and ESD protection meets ±2000V HBM, supporting robust industrial deployment.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Operating Range	4.5V to 5.5V - ensures compatibility with standard 5V TTL/CMOS systems and stable noise margin across supply variation.
Propagation Delay (t_PLH/t_PHL)	10.5ns at V_CC = 5V, C_L = 15pF - enables reliable 80MHz operation in high-speed synchronous interfaces.
Maximum Clock Frequency (f_max)	80MHz at C_L = 15pF - defines upper limit for continuous register update rate in data capture applications.
Output Drive (I_OH/I_OL)	±8mA at V_CC = 4.5V - sufficient to drive multiple 74-series inputs or light capacitive loads without external buffers.
Input Compatibility	TTL-compatible - accepts standard TTL logic levels (V_IL ≤ 0.8V, V_IH ≥ 2.0V) while operating on CMOS power rails.
3-State Enable Time (t_PZH/t_PZL)	11.5ns at C_L = 15pF - determines minimum bus turnaround latency when switching between driving and high-Z states.
Operating Temperature	–40°C to +85°C - qualifies for commercial and industrial ambient environments without derating.

Pinout & Package

SN74AHCT374DW is housed in a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm body size (12.8mm × 7.5mm excluding pins), with standard JEDEC MS-013 footprint and 1.27mm pitch.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Active-low output enable	Asserting low enables Q outputs; high places all eight outputs in high-impedance state - critical for bus arbitration and multi-driver systems.
2–9, 12, 15–16, 19 (Q1–Q8)	3-state output terminals	Reflect registered D-input values on CLK↑; tri-state when OE is high - eliminates bus contention without external isolation logic.
3–4, 7–8, 13–14, 17–18 (D1–D8)	Data inputs	Synchronously sampled on rising CLK edge - supports parallel loading of 8-bit data words into storage registers.
10 (CLK)	Clock input	Rising-edge sensitive; all eight flip-flops update simultaneously - ensures deterministic timing across channels for synchronized sampling.
11 (GND)	Ground reference	Primary return path for output sink current and internal logic - must be low-impedance to maintain VOL < 0.44V under full load.
20 (V_CC)	Positive supply	Power source for CMOS core and output drivers - requires local 0.1µF bypass capacitor to suppress switching noise.

Key Features

Feature	Design Value
Flow-through pinout	Input and output pins arranged to minimize trace crossovers on PCB - reduces routing complexity and signal integrity risk in dense bus layouts.
Simultaneous 8-bit registration	All Q outputs update on same CLK↑ edge - guarantees atomic data capture across parallel channels for coherent system state snapshots.
Independent OE control	OE does not affect internal latch state - allows new data to be loaded while outputs remain disabled, enabling pipelined bus handoff.
TTL-compatible inputs	Accepts standard TTL voltage thresholds (V_IL ≤ 0.8V, V_IH ≥ 2.0V) while powered from 5V CMOS supply - simplifies mixed-logic-level interfacing.
High-impedance output leakage	IOZ ≤ ±2.5µA at V_CC = 5.5V - ensures negligible bus loading during tri-state, preventing unintended signal coupling or power loss.

Applications

Parallel Data Synchronization	Parallel Data Storage
Use Scenario: Capturing 8-bit sensor readings or microcontroller port data on a shared system bus. IC Role / Device Role / Timing Role: Acts as a synchronous input register, latching parallel data on CLK↑ to decouple upstream timing from downstream processing. Use Value: Eliminates metastability risk by providing clean, edge-aligned data transfer with guaranteed setup/hold compliance (t_su/t_h = 2.5ns).	Use Scenario: Holding configuration bits or status flags in embedded control units where data must persist between processor cycles. IC Role / Device Role / Timing Role: Functions as a static 8-bit storage register, retaining Q-state until next CLK↑ event - no clock gating required. Use Value: Provides non-volatile-like retention using only clocked logic, avoiding SRAM overhead or EEPROM write latency.
Shift Register Stage	Pattern Generator Output Buffer
Use Scenario: Constructing a serial-to-parallel converter by cascading multiple SN74AHCT374DW devices with daisy-chained Q→D paths. IC Role / Device Role / Timing Role: Serves as one stage in a multi-cycle shift chain, propagating data forward on each CLK↑ with minimal added delay (10.5ns). Use Value: Enables precise bit alignment across stages due to matched t_PLH/t_PHL and simultaneous clocking - critical for deterministic serial protocol generation.	Use Scenario: Driving LED arrays, relay banks, or test equipment I/O ports with programmable 8-bit patterns generated by FPGA or MCU. IC Role / Device Role / Timing Role: Buffers and isolates pattern generator outputs via 3-state control, allowing dynamic reconfiguration of driven nodes. Use Value: Supports hot-swappable peripheral control: OE disables outputs before updating D inputs, preventing glitches during pattern changes.

Parallel Data Synchronization

Parallel Data Storage

Use Scenario: Capturing 8-bit sensor readings or microcontroller port data on a shared system bus.

IC Role / Device Role / Timing Role: Acts as a synchronous input register, latching parallel data on CLK↑ to decouple upstream timing from downstream processing.

Use Value: Eliminates metastability risk by providing clean, edge-aligned data transfer with guaranteed setup/hold compliance (t_su/t_h = 2.5ns).

Use Scenario: Holding configuration bits or status flags in embedded control units where data must persist between processor cycles.

IC Role / Device Role / Timing Role: Functions as a static 8-bit storage register, retaining Q-state until next CLK↑ event - no clock gating required.

Use Value: Provides non-volatile-like retention using only clocked logic, avoiding SRAM overhead or EEPROM write latency.

Shift Register Stage

Pattern Generator Output Buffer

Use Scenario: Constructing a serial-to-parallel converter by cascading multiple SN74AHCT374DW devices with daisy-chained Q→D paths.

IC Role / Device Role / Timing Role: Serves as one stage in a multi-cycle shift chain, propagating data forward on each CLK↑ with minimal added delay (10.5ns).

Use Value: Enables precise bit alignment across stages due to matched t_PLH/t_PHL and simultaneous clocking - critical for deterministic serial protocol generation.

Use Scenario: Driving LED arrays, relay banks, or test equipment I/O ports with programmable 8-bit patterns generated by FPGA or MCU.

IC Role / Device Role / Timing Role: Buffers and isolates pattern generator outputs via 3-state control, allowing dynamic reconfiguration of driven nodes.

Use Value: Supports hot-swappable peripheral control: OE disables outputs before updating D inputs, preventing glitches during pattern changes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT374DW	Higher drive (±24mA), faster t_PLH/t_PHL = 7.5ns, but requires stricter VIH/VIL (2.0V/0.8V at V_CC = 4.5V) and has higher ICC.	Better suited for driving heavier loads or higher-frequency buses (>100MHz), but less tolerant of marginal input transitions.	Select SN74ACT374DW only if higher speed or drive strength is required and input signal integrity is guaranteed.
74LVX374M	Lower V_CC range (2.7–3.6V), 3.3V-only operation, t_PLH/t_PHL = 9.5ns, lower power (ICC = 4µA typical), but not 5V-tolerant.	Designed for 3.3V systems; incompatible with 5V buses unless level-shifted - unsuitable for direct replacement in legacy 5V designs.	Choose 74LVX374M only in new 3.3V designs prioritizing ultra-low static power and smaller package options (SOIC-20 also available).

Compared with SN74AHCT374DW, SN74ACT374DW offers superior speed and drive at the cost of tighter input timing margins and higher quiescent current, while 74LVX374M targets 3.3V efficiency but lacks 5V compatibility - making SN74AHCT374DW the optimal balance of 5V interoperability, robustness, and performance for mixed-signal industrial interfaces.

Availability

SN74AHCT374DW is available at Aetrix Electronics and suitable for parallel data synchronization, bus interface buffering, shift register construction, and pattern generator output staging requiring stable component supply across industrial temperature ranges and long-term production continuity.

Supply support for SN74AHCT374DW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-reliability digital ICs.

The SN74AHCT374DW belongs to TI's AHCT logic family - engineered for 5V TTL-to-CMOS bridging with enhanced noise immunity, latch-up resistance, and consistent 3-state behavior across temperature and voltage extremes.

FAQ

What is the maximum clock frequency supported by the SN74AHCT374DW?

The SN74AHCT374DW supports a maximum clock frequency of 80MHz when loaded with 15pF, as specified in its switching characteristics table. At 50pF load, f_max drops to 75MHz. This rating assumes proper bypassing, stable V_CC within 4.5V–5.5V, and adherence to setup/hold timing (t_su = t_h = 2.5ns). Exceeding these conditions may cause timing violations or metastability in the SN74AHCT374DW.

Does the SN74AHCT374DW support 3.3V input signals while operating at 5V V_CC?

Yes - the SN74AHCT374DW features TTL-compatible inputs that accept 3.3V logic-high signals directly at 5V V_CC. Its V_IH(min) is 2.0V across the full operating range, ensuring reliable recognition of 3.3V HIGH levels. However, inputs must not exceed V_CC + 0.5V (5.5V max) per absolute ratings, so 3.3V signals are fully compliant and require no level-shifting when interfacing with the SN74AHCT374DW.

How does the OE pin behave during power-up of the SN74AHCT374DW?

The OE pin of the SN74AHCT374DW is active-low and does not have internal pull-up; during power-up, it defaults to undefined state. To ensure outputs remain in high-impedance until firmware initializes, TI recommends tying OE to V_CC via an external pull-up resistor (typically 10kΩ). This prevents bus contention at power-on and guarantees safe startup behavior for the SN74AHCT374DW in multi-driver systems.

Can unused D inputs on the SN74AHCT374DW be left floating?

No - unused D inputs on the SN74AHCT374DW must be terminated to either V_CC or GND. Floating CMOS inputs cause excessive current draw, oscillation, and potential device damage due to undefined gate voltage. TI specifies that all unused inputs be held static; a 10kΩ pull-up or pull-down resistor is recommended for uncommitted lines to maintain valid logic states and ensure reliable operation of the SN74AHCT374DW.

What thermal considerations apply to the SN74AHCT374DW in SOIC-20 package?

The SN74AHCT374DW in DW (SOIC-20) package has R_θJA = 58°C/W, meaning junction temperature rise is ~58°C per watt of dissipated power. At maximum rated ICC (40µA) and worst-case switching (C_pd = 27pF), total power remains well below 10mW - resulting in negligible self-heating. No heatsink is needed, but proper PCB copper pour on GND/V_CC planes improves thermal stability for the SN74AHCT374DW under sustained high-frequency operation.

SN74AHCT374DW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AHCT

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Bulk

Product Status:: Obsolete

Function:: Standard

Type:: D-Type

Output Type:: Tri-State, Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 130 MHz

Max Propagation Delay @ V, Max CL:: 10.4ns @ 5V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 8mA, 8mA

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Iq):: 4 µA

Input Capacitance:: 4 pF

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

SN74AHCT374DW FAQ

1.How can I place an order for SN74AHCT374DW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AHCT374DW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN74AHCT374DW reliable?

The price and inventory of SN74AHCT374DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT374DW is usually 5 days.

3.What payment methods are accepted for SN74AHCT374DW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT374DW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74AHCT374DW?

SN74AHCT374DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AHCT374DW order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN74AHCT374DW?

For technical support, including SN74AHCT374DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT374DW requirements.

6.How does Aetrix verify that SN74AHCT374DW is sourced from the original manufacturer or authorized distributors?

All SN74AHCT374DW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74AHCT374DW meets industry standards.

7.What is the process for return or replacement of SN74AHCT374DW?

All SN74AHCT374DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT374DW, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74AHCT374DW part is unused and in its original packaging.

Return procedure for SN74AHCT374DW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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