Texas Instruments SN74ACT374PWR

Overview

SN74ACT374PWR from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for bus interface and data latching in 5V digital systems. It operates from 4.5V to 5.5V V_CC, features 10ns max propagation delay at 5V, TTL-compatible inputs, and ±24mA output drive capability. It is used in I/O port expansion, bidirectional bus driving, and buffer register applications where high-speed, low-impedance load driving is required.

For engineers reviewing the SN74ACT374PWR datasheet, SN74ACT374PWR pinout, SN74ACT374PWR application, or SN74ACT374PWR equivalent, this page delivers verified electrical specs, TSSOP-20 package details, functional timing behavior, and real-world implementation context - all grounded in TI's SCAS539H production datasheet (March 2024 revision).

Technical Context

The SN74ACT374PWR implements eight independent D-type flip-flops, each triggered on the positive edge of CLK. Its 3-state outputs are controlled by a common OE (output enable) input, allowing full bus isolation without affecting internal latch state. OE remains fully functional during power-up/down when tied to V_CC via a pullup resistor.

It uses ACT (Advanced CMOS TTL-compatible) logic, delivering rail-to-rail output swing, 5V supply tolerance, and compatibility with legacy TTL signal levels. The device supports clock frequencies up to 90MHz (SN74ACT374 grade) and exhibits setup/hold times of 5.5ns/1.5ns respectively at 5V, enabling reliable synchronization in high-speed digital interfaces.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.50mm × 6.40mm body size, 1.2mm max height, 0.65mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT574PWR and 74LVC574APW,118, the SN74ACT374PWR uniquely balances 5V bus compatibility, single-OE simplicity, and industrial temperature range - making it the preferred choice for legacy 5V control systems requiring robust, drop-in latch functionality.

Availability

SN74ACT374PWR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller peripheral interface, and backplane data latching requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74ACT374PWR 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 industrial, automotive, and communications ICs.

The SN74ACT374PWR belongs to TI's Advanced CMOS (ACT) logic family, engineered for high-speed, 5V-tolerant digital interfacing in industrial control, instrumentation, and legacy system upgrades.

FAQ

What is the maximum clock frequency supported by the SN74ACT374PWR?

The SN74ACT374PWR supports a maximum clock frequency of 90MHz under recommended operating conditions (V_CC = 5V, T_A = −40°C to +85°C). This is specified in the Switching Characteristics table of TI's SCAS539H datasheet (Section 4.6), where f_max is guaranteed at 90MHz for the SN74ACT374 grade. At 25°C, typical performance reaches 160MHz, but design margins should adhere to the 90MHz limit for full temperature compliance.

Does the SN74ACT374PWR require external pull-up resistors on the OE pin?

Yes - for defined high-impedance state during power-up or power-down, OE must be tied to V_CC through a pullup resistor, as stated in Section 6.1 of the datasheet. The minimum resistor value depends on the current-sinking capability of the driving source; TI recommends evaluating system-level reset sequencing to ensure OE remains inactive (high) until valid V_CC is established. Leaving OE floating risks undefined output states.

Can the SN74ACT374PWR interface directly with 3.3V logic devices?

No - the SN74ACT374PWR is a 5V-only device with TTL-compatible inputs (V_IH = 2.0V min), but its outputs swing rail-to-rail (0V to V_CC). Driving a 3.3V-input device directly risks overvoltage damage unless the receiving device explicitly tolerates 5V inputs. For mixed-voltage systems, a level-shifter or 3.3V-tolerant buffer (e.g., SN74LVC245A) is required upstream of the SN74ACT374PWR outputs.

What is the thermal resistance (R_θJA) of the SN74ACT374PWR in its TSSOP-20 package?

The junction-to-ambient thermal resistance (R_θJA) for the SN74ACT374PWR in the PW (TSSOP-20) package is 126.2°C/W, as published in Section 4.3 of the SCAS539H datasheet. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves significantly with PCB copper pour and thermal vias under the exposed pad (if present) - though the PW package lacks an exposed thermal pad per TI's PW0020A outline.

How does the SN74ACT374PWR handle unused input pins?

All unused D and CLK inputs on the SN74ACT374PWR must be tied to a valid logic level - either V_CC or GND - to prevent floating nodes that cause excessive current draw, oscillation, or unpredictable latching. TI's application note SCBA004 mandates this practice. OE may be left unconnected only if permanently asserted (e.g., hardwired low), but best practice is to tie it to V_CC via pullup for fail-safe high-Z default behavior.