Texas Instruments SN74ACT374DWRG4

Overview

SN74ACT374DWRG4 from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for bus interface and data latching in digital systems operating at 4.5 V to 5.5 V. It features 20-pin SOIC (DW) packaging, 10 ns max propagation delay at 5 V, TTL-compatible inputs, and ±24 mA output drive capability. It is used in I/O port expansion, bidirectional bus driving, and buffer register applications.

For engineers reviewing the SN74ACT374DWRG4 datasheet, SN74ACT374DWRG4 pinout, SN74ACT374DWRG4 application, or SN74ACT374DWRG4 equivalent, key selection criteria include 3-state output control timing, clock-to-Q propagation delay, input voltage tolerance up to 5.5 V, and compatibility with 5 V TTL logic families in high-capacitance bus environments.

Technical Context

This device implements eight independent D-type flip-flops triggered on the rising edge of CLK, with synchronous data capture and asynchronous 3-state output enable (OE). Each flip-flop retains its state when OE is high, and places its Q output in high-impedance when OE is low-enabling shared bus operation without contention.

The architecture supports simultaneous data latching across all eight bits, with setup time of 5.5 ns and hold time of 1.5 ns at 5 V. Output drive strength (±24 mA) and low output leakage (±2.5 μA) ensure reliable signal integrity when interfacing with capacitive loads up to 50 pF.

Key Specifications

Pinout & Package

SN74ACT374DWRG4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm (body: 12.80 mm × 7.50 mm), RoHS-compliant with NIPDAU lead finish and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT374DWRG4, SN74ACT574DWR offers identical performance in 5 V systems but demands OE signal inversion, while 74LVC574APW targets modern low-voltage designs and cannot replace it in mixed-voltage or pure 5 V applications without redesign.

Availability

SN74ACT374DWRG4 is available at Aetrix Electronics and suitable for microprocessor bus interfaces, industrial PLC I/O expansion, test equipment data capture, and automotive body control modules requiring stable component supply across extended production lifecycles.

Supply support for SN74ACT374DWRG4 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 90 years of innovation in high-reliability digital components.

The SN74ACT374DWRG4 belongs to TI's advanced CMOS (ACT) logic family, engineered for high-speed, low-noise 5 V digital interfacing in industrial and computing applications where bus loading and timing precision are critical.

FAQ

What is the maximum clock frequency supported by the SN74ACT374DWRG4?

The SN74ACT374DWRG4 supports a maximum clock frequency of 90 MHz under recommended operating conditions (VCC = 5 V, TA = −40 °C to +85 °C), as specified in the switching characteristics table. This limit derives from the 10 ns maximum propagation delay and timing margins required for reliable edge-triggered operation.

Does the SN74ACT374DWRG4 require external pull-up resistors on the OE pin?

Yes - for defined high-impedance state during power-up or power-down, the OE pin of the SN74ACT374DWRG4 must be tied to VCC through a pull-up resistor. TI recommends sizing based on the driver's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ for robust noise immunity and fast disable timing.

Can the SN74ACT374DWRG4 interface directly with 3.3 V logic inputs?

No - the SN74ACT374DWRG4 is a 5 V device with TTL-compatible inputs (VIH = 2.0 V min), but its outputs swing rail-to-rail (0 V to VCC). Driving 3.3 V-only inputs risks overvoltage damage unless current-limiting resistors or level translators are used; it is not 3.3 V I/O tolerant.

What is the thermal resistance (RθJA) of the SN74ACT374DWRG4 in its SOIC package?

The SN74ACT374DWRG4 in the DW (SOIC-20) package has a junction-to-ambient thermal resistance (RθJA) of 58 °C/W, as measured under standard JEDEC test conditions. This value assumes a two-layer PCB with 1 in² copper pour; actual board layout significantly affects real-world thermal performance.

Is the SN74ACT374DWRG4 pin-compatible with older 74LS374 devices?

No - although both are octal D-type flip-flops with 3-state outputs, the SN74ACT374DWRG4 uses different AC timing (e.g., 10 ns tpd vs. 25 ns for LS), higher drive strength (±24 mA vs. ±8 mA), and TTL-compatible inputs without internal pull-ups. Direct replacement requires validation of timing margins and bus loading effects.