Texas Instruments SN74F374NSR

Overview

SN74F374NSR from Texas Instruments is an 8-bit edge-triggered D-type flip-flop IC with 3-state bus-driving outputs, designed for high-capacitance or low-impedance bus interfacing. It features positive-edge clock triggering, buffered output enable (OE), and operates over 0°C to 70°C with V_CC = 4.5–5.5 V. It is used in I/O port buffering, bidirectional data bus control, and working register applications.

For engineers reviewing the SN74F374NSR datasheet, SN74F374NSR pinout, SN74F374NSR application, or SN74F374NSR equivalent, key selection criteria include its 20-pin SOP (NS) package, 70 MHz max clock frequency, 3.2 ns typical t_PLH/t_PHL, ±24 mA output drive, and high-impedance output state enabling clean bus sharing without pull-ups or interface logic.

Technical Context

The SN74F374NSR implements eight independent D-type latches synchronized to the rising edge of CLK, with each Q output reflecting the corresponding D input at clock transition. Its OE input controls all eight outputs simultaneously, placing them in high-Z without affecting internal latch states - enabling concurrent data retention and new loading.

This device belongs to the TI 74F logic family, optimized for speed and noise immunity in TTL-compatible systems. It supports full parallel access, buffered control inputs, and is characterized for commercial temperature operation (0°C to 70°C), distinguishing it from military-grade SN54F374 variants rated for −55°C to 125°C.

Key Specifications

Pinout & Package

SN74F374NSR is housed in a 20-pin SOP (Small Outline Package) with NS package code, 0.635 mm lead pitch, 7.5 mm × 13.0 mm body size, and 2.4 mm max height per JEDEC MS-012. Pin 1 is located at the top-left corner with a beveled edge marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LS374N, SN74F374NSR delivers 3× higher clock rate and 3× stronger output drive; versus SN74ACT374NSR, it offers superior noise immunity and wider supply tolerance but higher static current - making SN74F374NSR optimal for legacy-compliant, high-drive, medium-speed bus applications.

Availability

SN74F374NSR is available at Aetrix Electronics and suitable for industrial control I/O expansion, legacy microprocessor data latching, and automated test fixture signal conditioning requiring stable component supply and long-term obsolescence management.

Supply support for SN74F374NSR 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 broad industrial and automotive reach.

The SN74F374NSR belongs to TI's 74F Fast TTL logic family, engineered for high-speed, noise-immune digital interfacing in commercial-grade systems where robust drive, predictable timing, and TTL compatibility are critical.

FAQ

What is the maximum clock frequency supported by SN74F374NSR?

The SN74F374NSR 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 reflects guaranteed timing performance across the full commercial temperature range - making SN74F374NSR suitable for high-speed bus latching in legacy computing and instrumentation systems.

Does SN74F374NSR support hot insertion or live bus swapping?

SN74F374NSR does not include explicit hot-swap protection circuitry. While its absolute maximum ratings allow output voltages up to 5.5 V in disabled state and ±50 µA high-Z leakage, TI does not characterize or guarantee safe operation during live insertion. For hot-swap applications, external series resistors or dedicated hot-swap controllers should be used alongside SN74F374NSR to limit inrush current and prevent bus disturbance.

Can SN74F374NSR operate with a 3.3 V supply?

No - SN74F374NSR is specified only for 4.5 V to 5.5 V operation. At 3.3 V, VIH and VOL thresholds fall outside guaranteed logic levels, and output drive collapses below usable margins. For 3.3 V systems, consider TI's SN74LVC374A or SN74ALVC374, which are functionally equivalent but designed for 3.3 V operation and offer compatible pinouts and timing.

What is the pin 1 marking convention for SN74F374NSR in SOP-20 package?

SN74F374NSR in the NS package uses a beveled edge or notch at the top-left corner of the package body to indicate pin 1 location. The part marking "74F374" appears adjacent to this corner, consistent with TI's SOP tape-and-reel orientation (Q1 quadrant). No dot or other secondary marker is used - mechanical edge identification is the sole pin 1 indicator per TI DB0020A package drawing.

How does the output enable (OE) function interact with internal latch states in SN74F374NSR?

In SN74F374NSR, the OE input affects only the output drivers - not internal flip-flop states. When OE is high, all Q outputs enter high-impedance regardless of stored data; when OE returns low, previously latched values reappear immediately without retriggering CLK. This allows seamless data retention and bus arbitration, enabling SN74F374NSR to serve as a non-intrusive bus buffer in multi-master systems.