Texas Instruments SN74AC74PWRG4

Overview

SN74AC74PWRG4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop IC with independent asynchronous clear (CLR) and preset (PRE) inputs per channel, 2V–6V supply operation, <10ns propagation delay at 5V, and complementary Q/Q̅ outputs per stage - used in clock division, toggle-switch conversion, and synchronous logic control in industrial control panels and digital instrumentation.

For engineers reviewing the SN74AC74PWRG4 datasheet, SN74AC74PWRG4 pinout, SN74AC74PWRG4 application, or SN74AC74PWRG4 equivalent, key selection criteria include VCC range compatibility (2–6V), tpd ≤10ns at 5V, TSSOP-14 package footprint, and support for asynchronous reset/preset in edge-triggered storage applications.

Technical Context

The SN74AC74PWRG4 implements two independent CMOS D-type flip-flops, each with separate active-low asynchronous PRE and CLR inputs, positive-edge-sensitive CLK, and true/complement outputs. Its balanced push-pull outputs drive ±24mA at 4.5V while maintaining rail-to-rail VOH/VOL across 2V–6V VCC.

It operates over −40°C to +85°C, supports fast input transitions (≤8 ns/V), and requires all unused inputs tied to VCC or GND to prevent floating-induced oscillation or excess power draw - consistent with standard CMOS input behavior and latch stability requirements.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 5mm × 6.4mm body with 0.65mm pitch, exposed pad not present - compatible with standard reflow profiles and automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual D-type flip-flop applications.

Compared with SN74AC74PWRG4, SN74LVC74APWR offers faster switching at 3.3V but sacrifices 5V interoperability, while MC74AC74DT matches electrical behavior exactly but trades TSSOP space efficiency for SOIC manufacturability and thermal margin.

Availability

SN74AC74PWRG4 is available at Aetrix Electronics and suitable for industrial control logic, digital instrumentation, test equipment sequencing, and embedded system state management requiring stable component supply, long-term lifecycle support, and verified TSSOP-14 sourcing.

Supply support for SN74AC74PWRG4 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 decades of experience in high-reliability industrial and automotive-grade components.

The SNx4AC74 product line delivers advanced CMOS dual D-type flip-flops optimized for robust edge-triggered storage in noise-prone industrial environments, supporting wide VCC ranges and fast timing without compromising DC accuracy or thermal stability.

FAQ

What is the maximum clock frequency supported by SN74AC74PWRG4 at 5V?

The SN74AC74PWRG4 supports up to 125MHz maximum clock frequency at VCC = 5V ± 0.5V, as specified in the Switching Characteristics table (Section 5.8). This value accounts for worst-case process, voltage, and temperature conditions across the commercial temperature range (−40°C to +85°C), ensuring reliable operation in high-speed digital systems where the SN74AC74PWRG4 serves as a clock divider or state register.

Does SN74AC74PWRG4 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs of SN74AC74PWRG4 must be terminated to either VCC or GND to prevent floating nodes, which can cause excessive current draw, oscillation, or undefined output states. TI recommends 10kΩ pull-up or pull-down resistors if the input may be left un-driven during certain modes; direct connection is acceptable for permanently fixed signals. This requirement applies to PRE, CLR, D, and CLK pins not actively used in the design.

Can SN74AC74PWRG4 operate reliably at 3.3V supply voltage?

Yes - SN74AC74PWRG4 is fully specified for operation at 3.3V (within its 2V–6V VCC range), with characterized timing (fclock = 95MHz max, tpd = 13.5ns max), electrical (VOH ≥ 2.46V, VOL ≤ 0.44V), and thermal performance. Its inputs accept voltages up to 6V, enabling safe interfacing with 5V signals in mixed-voltage 3.3V systems without level translation.

What is the function of the inverted output (Q̅) pins on SN74AC74PWRG4?

The inverted output (Q̅) pins on SN74AC74PWRG4 provide the logical complement of the corresponding Q output, enabling direct implementation of toggle functionality (via D→Q̅ feedback), synchronous reset/set circuits, and differential signaling without external inverters. Each Q̅ output mirrors the internal latch state with matched propagation delay and drive capability, preserving timing integrity in critical paths where SN74AC74PWRG4 is deployed.

Is SN74AC74PWRG4 pin-compatible with other TSSOP-14 dual D-flip-flop devices?

SN74AC74PWRG4 follows the industry-standard TSSOP-14 pinout for dual D-type flip-flops (e.g., 1CLR, 1D, 1CLK, 1PRE, 1Q, 1Q̅, GND, 2Q̅, 2Q, 2PRE, 2CLK, 2D, 2CLR, VCC), making it mechanically and electrically compatible with functionally equivalent parts like SN74LVC74APWR and MC74AC74DT in the same package. However, voltage and timing specifications differ, so electrical validation is required before substitution.