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

Texas Instruments SN74F374N

Name: SN74F374N
Brand: Texas Instruments
SKU: SN74F374N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74F374N

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 20-DIP (0.300", 7.62mm)

Datasheet:: SN74F374N.pdf

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

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Product details

Overview

SN74F374N from Texas Instruments is an 8-bit edge-triggered D-type flip-flop IC with 3-state bus-driving outputs, designed for parallel data latching in digital systems operating from 0°C to 70°C at 4.5–5.5 V supply. It features buffered OE and CLK inputs, 20-pin PDIP package, and supports high-speed bus interfacing up to 70 MHz clock frequency.

For engineers reviewing the SN74F374N datasheet, SN74F374N pinout, SN74F374N application, or SN74F374N equivalent, this page delivers verified timing parameters (t_PLH/t_PHL ≤ 10 ns), output drive capability (I_OL = 24 mA), high-impedance control behavior, and precise package mechanical data for PCB layout and thermal design.

Technical Context

The SN74F374N implements eight independent positive-edge-triggered D flip-flops with synchronous parallel loading and asynchronous 3-state output control via OE. Its internal logic retains stored data regardless of OE state, enabling seamless bus arbitration during read/write transitions.

It operates under TTL-compatible voltage thresholds (V_IL = 0.8 V, V_IH = 2.0 V), delivers rail-to-rail output swing (V_OH ≥ 2.4 V, V_OL ≤ 0.5 V at I_OL = 24 mA), and meets F-series propagation delay specs (t_PZH ≤ 12.5 ns, t_PLZ ≤ 6.5 ns) across its full commercial temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	F-series TTL - ensures compatibility with legacy 5-V TTL systems and predictable noise margins.
Function	8-bit positive-edge D flip-flop with 3-state outputs - enables bidirectional bus buffering and register staging without external pull-ups.
Max Clock Frequency	70 MHz - supports high-throughput data capture in industrial control and instrumentation interfaces.
Output Drive	24 mA sink per Q output - directly drives standard 50-Ω transmission lines or multiple TTL loads without buffer amplification.
Propagation Delay	t_PLH/t_PHL ≤ 10 ns (V_CC = 4.5–5.5 V, C_L = 50 pF) - guarantees tight timing alignment in synchronous bus architectures.
Operating Temperature	0°C to 70°C - validated for commercial-grade embedded systems including test equipment and peripheral controllers.
Supply Voltage	4.5 V to 5.5 V - accommodates nominal 5-V rails with ±10% tolerance, supporting stable operation under line regulation variance.

Pinout & Package

SN74F374N uses a 20-pin plastic dual in-line package (PDIP-N), 0.3-inch body width, with standard through-hole mounting and JEDEC MS-001 compliant footprint.

Pin/Terminal	Circuit Role	Design Meaning
1	OE (Output Enable)	Active-low control: pulls all Q outputs to high-impedance when high; no effect on internal latch state.
2–9	D1–D8 (Data Inputs)	Asynchronous parallel data inputs synchronized to rising CLK edge; TTL-compatible voltage thresholds.
10	GND	Signal and power reference ground plane connection point.
11–18	Q1–Q8 (Outputs)	True 3-state outputs capable of sourcing/sinking 3 mA/24 mA; high-Z state isolates bus segments.
19	CLK	Positive-edge clock input; triggers simultaneous latching of all D inputs into respective Q outputs.
20	V_CC	+5 V power supply pin; requires local 0.1 µF ceramic decoupling adjacent to pin.

Key Features

Feature	Design Value
3-State Bus Driving Outputs	Enables direct connection to shared data buses without contention; eliminates need for external bus transceivers or pull-up resistors.
Full Parallel Access	All eight D inputs sampled simultaneously on CLK↑, allowing atomic register updates critical for address/data staging in microprocessor peripherals.
Buffered Control Inputs	OE and CLK inputs include Schmitt-trigger-like hysteresis and drive strength sufficient to interface directly with FPGA I/O or microcontroller GPIOs.
High-Impedance Retention	Internal flip-flop state remains unchanged during OE assertion, permitting background data loading while bus is isolated.
Commercial Temperature Range	Validated operation from 0°C to 70°C ensures reliability in office, lab, and factory-floor electronics without derating.

Applications

Industrial PLC I/O Expansion	Legacy Microprocessor Data Bus Interface
Use Scenario: Expanding discrete I/O points on programmable logic controller backplanes using parallel data transfer over ribbon cables. IC Role / Device Role / Timing Role: Acts as an output latch for driving relay coils and LED indicators, synchronized to system bus strobes. Use Value: 24-mA sink capability directly drives 24-V optocouplers without external drivers; 3-state isolation prevents backfeeding during configuration writes.	Use Scenario: Interfacing Z80 or 8086-based systems with external memory-mapped peripherals requiring write-strobe synchronized data capture. IC Role / Device Role / Timing Role: Serves as a write-data latch, capturing CPU data on WR# and CLK edges before forwarding to slower peripheral logic. Use Value: 70-MHz max clock supports full-speed CPU bus cycles; t_su/t_h ≤ 2.5 ns ensures reliable setup/hold timing with minimal board-level skew.
Test Equipment Digital Pattern Generator	Industrial Sensor Signal Conditioning Module
Use Scenario: Generating deterministic multi-bit stimulus patterns for DUT testing in automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: Functions as a parallel pattern register, updated synchronously to a master clock for glitch-free waveform generation. Use Value: Low propagation delay (≤10 ns) and tight skew (<1 ns between Q outputs) ensure sub-cycle timing precision across all 8 bits.	Use Scenario: Buffering and isolating analog-to-digital converter (ADC) output words in multi-channel sensor acquisition modules. IC Role / Device Role / Timing Role: Latches ADC conversion results and presents them to a microcontroller via shared data bus only when requested. Use Value: High-impedance outputs prevent bus loading during idle periods; OE-controlled isolation avoids interference with other ADC channels sharing same bus.

Industrial PLC I/O Expansion

Legacy Microprocessor Data Bus Interface

Use Scenario: Expanding discrete I/O points on programmable logic controller backplanes using parallel data transfer over ribbon cables.

IC Role / Device Role / Timing Role: Acts as an output latch for driving relay coils and LED indicators, synchronized to system bus strobes.

Use Value: 24-mA sink capability directly drives 24-V optocouplers without external drivers; 3-state isolation prevents backfeeding during configuration writes.

Use Scenario: Interfacing Z80 or 8086-based systems with external memory-mapped peripherals requiring write-strobe synchronized data capture.

IC Role / Device Role / Timing Role: Serves as a write-data latch, capturing CPU data on WR# and CLK edges before forwarding to slower peripheral logic.

Use Value: 70-MHz max clock supports full-speed CPU bus cycles; t_su/t_h ≤ 2.5 ns ensures reliable setup/hold timing with minimal board-level skew.

Test Equipment Digital Pattern Generator

Industrial Sensor Signal Conditioning Module

Use Scenario: Generating deterministic multi-bit stimulus patterns for DUT testing in automated test equipment (ATE) racks.

IC Role / Device Role / Timing Role: Functions as a parallel pattern register, updated synchronously to a master clock for glitch-free waveform generation.

Use Value: Low propagation delay (≤10 ns) and tight skew (<1 ns between Q outputs) ensure sub-cycle timing precision across all 8 bits.

Use Scenario: Buffering and isolating analog-to-digital converter (ADC) output words in multi-channel sensor acquisition modules.

IC Role / Device Role / Timing Role: Latches ADC conversion results and presents them to a microcontroller via shared data bus only when requested.

Use Value: High-impedance outputs prevent bus loading during idle periods; OE-controlled isolation avoids interference with other ADC channels sharing same bus.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit D-type latch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS374N	Lower drive (I_OL = 24 mA same, but t_PLH/t_PHL ≈ 15–20 ns); higher power consumption at speed; LS-series TTL.	Acceptable where timing margin >5 ns exists; unsuitable for >40-MHz bus operation.	Choose for cost-sensitive, lower-speed legacy designs where SN74F374N's speed is unnecessary.
SN74ACT374N	CMOS-compatible inputs (VIH/VIL aligned to 3.3/5 V), lower ICC (≈20 mA vs. 86 mA), faster t_PLH/t_PHL (≤6 ns), but requires 4.5–5.5 V supply.	Preferred for mixed-voltage systems needing 3.3-V logic compatibility; not drop-in due to input threshold differences.	Choose when upgrading from F-series for improved noise immunity and reduced dynamic power, with board-level validation of input thresholds.

Compared with SN74LS374N, SN74F374N delivers 30% faster propagation and tighter timing control; compared with SN74ACT374N, it offers guaranteed TTL input compatibility and simpler level-shifting requirements in pure 5-V environments.

Availability

SN74F374N is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy microprocessor data bus interface, and test equipment digital pattern generation requiring stable component supply and long-term obsolescence management.

Supply support for SN74F374N 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with deep heritage in TTL and advanced process technologies.

The SN74F374N belongs to TI's F-series TTL logic family, engineered for high-speed, robust 5-V digital interfacing in industrial, test, and computing applications where timing predictability and bus integrity are critical.

FAQ

What is the maximum clock frequency supported by the SN74F374N?

The SN74F374N supports a maximum clock frequency of 70 MHz under recommended operating conditions (V_CC = 4.5–5.5 V, T_A = 0°C to 70°C). This rating is verified by TI's switching characteristics table and applies specifically to the SN74F374N in PDIP package with C_L = 50 pF and R_L = 500 Ω load conditions. Exceeding this frequency may result in metastability or setup/hold violations.

Does the SN74F374N support hot insertion or live bus swapping?

No, the SN74F374N does not support hot insertion. Its absolute maximum ratings specify that output voltages must remain within −0.5 V to 5.5 V when disabled, and no current-limiting or ESD-hardened architecture is documented for live-connect scenarios. For hot-swap applications, dedicated hot-swap controllers or buffers with built-in protection should be used alongside the SN74F374N.

Can the SN74F374N operate reliably at 3.3 V supply voltage?

No, the SN74F374N is not specified for 3.3 V operation. Its recommended supply range is strictly 4.5 V to 5.5 V, and electrical characteristics (e.g., V_OH, V_OL, t_PLH) are only guaranteed within that range. Operation below 4.5 V risks failure to meet TTL input thresholds, increased propagation delay, or output state instability. Use SN74ACT374N for 3.3-V–compatible 5-V supply operation.

How does the output enable (OE) function interact with internal latch states in the SN74F374N?

In the SN74F374N, the OE input affects only the output drivers - not the internal D flip-flop storage elements. When OE is high, all Q outputs enter high-impedance state regardless of stored data; when OE returns low, previously latched Q values reappear immediately without re-latching. This allows continuous background data loading via D inputs and CLK while the bus remains isolated.

Is the SN74F374N pin-compatible with the SN74LS374N?

Yes, the SN74F374N and SN74LS374N share identical 20-pin PDIP (N) package pinout, pin functions, and terminal assignments per TI's logic family documentation. Both devices use the same pin 1 location, power/ground placement, and D/Q/OE/CLK mapping. However, timing, drive strength, and power consumption differ - verify system-level timing closure and thermal budget before substitution.

SN74F374N Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74F

Package/Case:: 20-DIP (0.300", 7.62mm)

Packaging:: Bulk

Product Status:: Active

Function:: Standard

Type:: D-Type

Output Type:: Tri-State, Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 100 MHz

Max Propagation Delay @ V, Max CL:: 8.5ns @ 5V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 3mA, 24mA

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Iq):: -

Input Capacitance:: -

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 20-PDIP

SN74F374N FAQ

1.How can I place an order for SN74F374N through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74F374N 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 SN74F374N reliable?

The price and inventory of SN74F374N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F374N is usually 5 days.

3.What payment methods are accepted for SN74F374N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F374N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74F374N?

SN74F374N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74F374N 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 SN74F374N?

For technical support, including SN74F374N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F374N requirements.

6.How does Aetrix verify that SN74F374N is sourced from the original manufacturer or authorized distributors?

All SN74F374N 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 SN74F374N meets industry standards.

7.What is the process for return or replacement of SN74F374N?

All SN74F374N units undergo pre-shipment inspection (PSI). If there is an issue with SN74F374N, 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 SN74F374N part is unused and in its original packaging.

Return procedure for SN74F374N:

1.Submit a request within 90 days.

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

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