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

Texas Instruments SN74AC374NS

Name: SN74AC374NS
Brand: Texas Instruments
SKU: SN74AC374NS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AC374NS

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SN74AC374NS.pdf

Description:: D-TYPE POS TRG SNGL 20SO

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Product details

Overview

SN74AC374NS from Renesas is an octal D-type flip-flop with 3-state outputs, designed for bus-oriented digital systems. It features a buffered positive-edge-triggered clock (CP), common output enable (OE), individual D inputs per flip-flop, and operates across 2–6 V supply. It delivers ±24 mA output drive and supports high-speed data latching in industrial control and memory interface applications.

For engineers reviewing the SN74AC374NS datasheet, SN74AC374NS pinout, SN74AC374NS application, or SN74AC374NS equivalent, this page provides verified functional role, timing behavior under 3.3 V/5 V operation, 3-state bus contention management, and validated drop-in alternatives for legacy TTL- and CMOS-compatible logic designs.

Technical Context

The SN74AC374NS implements eight edge-triggered D flip-flops sharing one buffered clock and one buffered output enable signal. Each flip-flop captures its D input on the low-to-high transition of CP, meeting setup/hold times as low as 1.0 ns (t_su = 5.5 ns min at 3.3 V) and t_h = 1.0 ns min.

Its 3-state outputs support bidirectional bus architectures: OE low enables true-level outputs; OE high places all O0–O7 pins in high-impedance state without affecting internal flip-flop states. Output drive capability is ±24 mA at V_CC = 4.5 V, with VOL ≤ 0.37 V and VOH ≥ 3.80 V under load.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	Advanced CMOS (AC), TTL-compatible input thresholds only in ACT variant - SN74AC374NS uses CMOS VIH/VIL (e.g., VIH = 2.1 V min at VCC = 3.0 V)
Supply Voltage Range	2.0 V to 6.0 V - enables direct interfacing with 3.3 V and 5 V logic domains without level shifters
Max Clock Frequency	100 MHz at VCC = 5.0 V - supports high-throughput data capture in address/data latching and pipeline stages
Propagation Delay (CP→O)	9.5 ns max (tPLH/tPHL) at VCC = 5.0 V - ensures tight timing margins in synchronous bus interfaces
Output Drive Strength	±24 mA sink/source - drives standard 50 Ω transmission lines or multiple 74-series inputs without buffering
3-State Enable/Disable Time	tZH/tZL ≤ 9.5 ns, tHZ/tLZ ≤ 12.5 ns at VCC = 5.0 V - minimizes bus turnaround latency in shared-data-path systems
Operating Temperature	–40 °C to +85 °C - qualified for industrial-grade embedded control and instrumentation environments

Pinout & Package

SN74AC374NS is supplied in a 20-pin plastic DIP package (JEDEC MS-001, package code DP-20N), with 2.54 mm lead pitch and through-hole mounting. Pin 1 is top-left corner (notch side), pin 20 is V_CC, pin 10 is GND.

Pin/Terminal	Circuit Role	Design Meaning
1–8, 12–19	D0–D7, O0–O7	Independent data inputs and true 3-state outputs - enables parallel 8-bit data capture and bus isolation
9	OE	Active-low 3-state output enable - controls all eight outputs simultaneously; high = high-Z, low = enabled
11	CP	Buffered positive-edge-triggered clock - synchronizes latch action across all flip-flops on rising edge
10	GND	Ground reference - decoupling capacitor required near pin for noise immunity during switching
20	VCC	Power supply - must be stabilized between 2.0 V and 6.0 V; typical use at 5.0 V or 3.3 V

Key Features

Feature	Design Value
Edge-triggered storage	Latches D0–D7 on precise low-to-high CP transition - eliminates metastability risk in asynchronous input scenarios
Bus-oriented 3-state outputs	O0–O7 enter high-impedance state when OE is high - allows safe connection to shared data buses without contention
High-output current drive	±24 mA per output at VCC = 4.5 V - directly drives 50 Ω traces or up to 10 LSTTL loads
Wide supply voltage range	Operates from 2.0 V to 6.0 V - supports mixed-voltage system integration and brown-out tolerance
Industrial temperature grade	Specified from –40 °C to +85 °C - suitable for factory automation, motor control, and outdoor electronics

Applications

Industrial PLC I/O Expansion	Legacy Bus Interface Adapter
Use Scenario: Expanding discrete input/output points in programmable logic controllers using parallel backplane buses. IC Role / Device Role / Timing Role: SN74AC374NS acts as an 8-bit synchronized input latch and output register, capturing sensor status or driving relay drivers under CPU-controlled CP and OE signals. Use Value: Enables deterministic sampling of 8-bit status words with sub-10 ns propagation delay and robust 3-state isolation during bus arbitration.	Use Scenario: Bridging modern microcontrollers to legacy ISA or VMEbus peripherals requiring 8-bit latched data transfer. IC Role / Device Role / Timing Role: SN74AC374NS serves as a bidirectional data buffer, latching write data on CP edge and presenting read data via OE-controlled 3-state outputs. Use Value: Provides glitch-free handshaking with tZH ≤ 9.5 ns and full compatibility with 5 V TTL bus timing requirements.
Memory Address Latch	Digital Test Equipment Signal Capture
Use Scenario: Holding multiplexed address bits in microprocessor-based systems with external SRAM or EPROM. IC Role / Device Role / Timing Role: SN74AC374NS captures and holds upper/lower address byte on ALE-equivalent CP signal, freeing address bus for data phase. Use Value: Delivers 100 MHz max clock rate and <10 ns propagation delay - meets tight timing budgets in 8/16-bit MPU systems.	Use Scenario: Capturing parallel digital waveforms from DUTs in automated test equipment with precise time-stamped sampling. IC Role / Device Role / Timing Role: SN74AC374NS functions as a synchronous 8-bit acquisition latch triggered by system sample clock (CP) and gated by test enable (OE). Use Value: Ensures sub-10 ns skew across all 8 bits and ±24 mA drive to feed FPGA or ADC front-end without signal degradation.

Industrial PLC I/O Expansion

Legacy Bus Interface Adapter

Use Scenario: Expanding discrete input/output points in programmable logic controllers using parallel backplane buses.

IC Role / Device Role / Timing Role: SN74AC374NS acts as an 8-bit synchronized input latch and output register, capturing sensor status or driving relay drivers under CPU-controlled CP and OE signals.

Use Value: Enables deterministic sampling of 8-bit status words with sub-10 ns propagation delay and robust 3-state isolation during bus arbitration.

Use Scenario: Bridging modern microcontrollers to legacy ISA or VMEbus peripherals requiring 8-bit latched data transfer.

IC Role / Device Role / Timing Role: SN74AC374NS serves as a bidirectional data buffer, latching write data on CP edge and presenting read data via OE-controlled 3-state outputs.

Use Value: Provides glitch-free handshaking with tZH ≤ 9.5 ns and full compatibility with 5 V TTL bus timing requirements.

Memory Address Latch

Digital Test Equipment Signal Capture

Use Scenario: Holding multiplexed address bits in microprocessor-based systems with external SRAM or EPROM.

IC Role / Device Role / Timing Role: SN74AC374NS captures and holds upper/lower address byte on ALE-equivalent CP signal, freeing address bus for data phase.

Use Value: Delivers 100 MHz max clock rate and <10 ns propagation delay - meets tight timing budgets in 8/16-bit MPU systems.

Use Scenario: Capturing parallel digital waveforms from DUTs in automated test equipment with precise time-stamped sampling.

IC Role / Device Role / Timing Role: SN74AC374NS functions as a synchronous 8-bit acquisition latch triggered by system sample clock (CP) and gated by test enable (OE).

Use Value: Ensures sub-10 ns skew across all 8 bits and ±24 mA drive to feed FPGA or ADC front-end without signal degradation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT374N	TTL-compatible inputs (VIH = 2.0 V min at VCC = 4.5 V); otherwise identical AC specs and pinout	Better interoperability with legacy 74LS/74F systems; requires no input level translation	Select SN74ACT374N when interfacing with older TTL logic families; SN74AC374NS preferred for pure CMOS systems.
74LCX374M	Lower VCC range (2.0–3.6 V only); higher speed (155 MHz @ 3.3 V); different pinout (SOIC-20)	Optimized for 3.3 V-only systems; not compatible with 5 V buses or DIP layouts	Choose 74LCX374M for new 3.3 V designs needing higher fmax; SN74AC374NS retains 5 V support and DIP footprint.

Compared with SN74ACT374N, SN74AC374NS offers superior noise margin in CMOS systems but lacks TTL input compatibility; versus 74LCX374M, it sacrifices peak speed for dual-voltage operation and through-hole package availability - critical for prototyping and industrial repair.

Availability

SN74AC374NS is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, and memory address latching requiring stable component supply across long-lifecycle programs.

Supply support for SN74AC374NS 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and timing solutions for automotive, industrial, and infrastructure markets.

The HD74AC374 series was developed by Renesas to provide high-speed, low-power octal D flip-flops with robust 3-state bus interface capability for industrial control and legacy system upgrades.

FAQ

What is the maximum operating frequency of SN74AC374NS?

The SN74AC374NS achieves a maximum clock frequency of 100 MHz at V_CC = 5.0 V and 60 MHz at V_CC = 3.3 V, as specified in its AC characteristics table. This performance enables reliable use in high-speed data capture and bus interface applications where timing margins are constrained. The SN74AC374NS maintains consistent timing behavior across its full industrial temperature range (–40 °C to +85 °C).

Does SN74AC374NS support 3.3 V operation?

Yes, SN74AC374NS is fully specified for 3.3 V operation (V_CC = 3.3 V ± 0.3 V), with guaranteed parameters including f_max = 60 MHz, t_PLH/t_PHL ≤ 15.5 ns, and VIH = 2.1 V min. Its 2.0–6.0 V supply range allows seamless integration into mixed-voltage systems without level-shifting circuitry.

What is the function of the OE pin on SN74AC374NS?

The OE (Output Enable) pin on SN74AC374NS is an active-low control that places all eight outputs (O0–O7) into high-impedance state when driven high, and enables normal true-level output when driven low. This function is essential for bus-sharing applications, and OE operation is independent of internal flip-flop states - latched data remains preserved regardless of OE level.

Is SN74AC374NS pin-compatible with SN74ACT374N?

Yes, SN74AC374NS and SN74ACT374N share identical pinout, package dimensions, and functional block diagram. The only difference lies in input threshold specifications: SN74ACT374N has TTL-compatible inputs (VIH = 2.0 V min), while SN74AC374NS uses standard CMOS thresholds (VIH = 2.1 V min at V_CC = 3.0 V). Both are drop-in replacements in DIP-20 sockets.

What are the absolute maximum ratings for SN74AC374NS?

The absolute maximum ratings for SN74AC374NS include V_CC = –0.5 V to +7.0 V, input voltage = –0.5 V to V_CC + 0.5 V, output voltage = –0.5 V to V_CC + 0.5 V, and DC output current = ±50 mA per pin. Exceeding these limits may cause permanent damage. Recommended operating conditions constrain V_CC to 2.0–6.0 V and ambient temperature to –40 °C to +85 °C.

SN74AC374NS Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Function:: -

Type:: -

Output Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Clock Frequency:: -

Max Propagation Delay @ V, Max CL:: -

Trigger Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Current - Quiescent (Iq):: -

Input Capacitance:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SN74AC374NS FAQ

1.How can I place an order for SN74AC374NS through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AC374NS 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 SN74AC374NS reliable?

The price and inventory of SN74AC374NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC374NS is usually 5 days.

3.What payment methods are accepted for SN74AC374NS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC374NS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74AC374NS?

SN74AC374NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AC374NS 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 SN74AC374NS?

For technical support, including SN74AC374NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC374NS requirements.

6.How does Aetrix verify that SN74AC374NS is sourced from the original manufacturer or authorized distributors?

All SN74AC374NS 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 SN74AC374NS meets industry standards.

7.What is the process for return or replacement of SN74AC374NS?

All SN74AC374NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC374NS, 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 SN74AC374NS part is unused and in its original packaging.

Return procedure for SN74AC374NS:

1.Submit a request within 90 days.

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

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