Texas Instruments SN74AHC74PW

Overview

SN74AHC74PW from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent asynchronous clear (CLR) and preset (PRE) inputs, operating across 2 V to 5.5 V supply range, supporting clock frequencies up to 110 MHz at 5 V, and delivering ±8 mA output drive. It implements synchronous data latching on rising clock edges and asynchronous state control for use in digital logic sequencing, clock division, and signal debouncing.

For engineers reviewing the SN74AHC74PW datasheet, SN74AHC74PW pinout, SN74AHC74PW application, or SN74AHC74PW equivalent, this page delivers verified functional identity, TSSOP-14 package mapping, timing parameters (t_su = 5 ns, t_PLH = 4.6 ns @ 5 V), ESD robustness (±2000 V HBM), and two validated alternative parts for design continuity.

Technical Context

The SN74AHC74PW implements two independent D-type flip-flop channels, each with separate PRE and CLR inputs that override clock and data when asserted low. Clock triggering occurs at a defined voltage threshold-not dependent on edge slew rate-ensuring reliable operation with slow or noisy clock signals.

Each channel supports simultaneous asynchronous set/reset and synchronous data capture, with guaranteed setup (5 ns) and hold (0.5 ns) times at 5 V, and output propagation delays as low as 4.6 ns (t_PLH) into 15 pF loads. The device maintains full functionality across –40°C to +125°C ambient temperature.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed pad optional, RoHS-compliant, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC74APW and MC74VHC74DT, the SN74AHC74PW uniquely balances 5 V compatibility, low ICC (20 µA max), and industry-standard TSSOP-14 footprint-making it optimal for mixed-voltage industrial control and legacy 5 V system upgrades.

Availability

SN74AHC74PW is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and embedded instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74AHC74PW 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 expertise in high-reliability logic families.

The SN74AHC74PW belongs to the AHC (Advanced High-Speed CMOS) logic family, designed for low-power, high-speed digital interfacing in industrial, automotive, and communications equipment where noise immunity and wide supply range are critical.

FAQ

What is the maximum clock frequency supported by SN74AHC74PW at 3.3 V?

The SN74AHC74PW supports a maximum clock frequency of 70 MHz at VCC = 3.3 V ± 0.3 V with a 15 pF load, as specified in Section 5.8 of the official datasheet. This value is measured under recommended operating conditions and accounts for worst-case timing across temperature and voltage variations. Performance remains functional beyond this limit but may violate setup/hold or propagation delay specifications.

Does SN74AHC74PW have built-in Schmitt-trigger inputs?

No, the SN74AHC74PW does not integrate Schmitt-trigger inputs. Its inputs follow standard CMOS thresholds (VIH ≈ 0.7×VCC, VIL ≈ 0.3×VCC). For noisy or slow-rising signals, external Schmitt-trigger buffers-such as the SN74LVC1G17-are recommended before connecting to CLK, D, PRE, or CLR pins to ensure clean edge detection and prevent metastability.

Can SN74AHC74PW operate reliably at 2.0 V supply voltage?

Yes, SN74AHC74PW is fully specified to operate at 2.0 V, with guaranteed timing (t_su = 7 ns, f_MAX = 70 MHz @ CL = 15 pF) and DC parameters (VOH ≥ 1.9 V, VOL ≤ 0.1 V) across –40°C to +125°C. This makes SN74AHC74PW suitable for battery-powered devices with brown-out conditions or multi-rail systems transitioning between sleep and active modes.

Is the thermal pad on SN74AHC74PW's TSSOP-14 package required to be soldered?

No-the SN74AHC74PW in PW (TSSOP-14) package does not include an exposed thermal pad. That feature applies only to RGY (VQFN) and BQA (WQFN) variants. The PW package uses standard 14-pin TSSOP construction with no thermal pad; thermal management relies on PCB copper area connected to GND and VCC pins per JEDEC MO-153 guidelines.

How should unused inputs be terminated on SN74AHC74PW?

All unused inputs on SN74AHC74PW-including 1CLK, 1D, 1PRE, 1CLR, 2CLK, 2D, 2PRE, and 2CLR-must be tied to either VCC or GND via direct connection or a pull-up/pull-down resistor (typically 10 kΩ). Floating inputs risk undefined logic states, increased ICC, and potential oscillation due to CMOS input sensitivity. Unused outputs (1Q, 1Q, 2Q, 2Q) may be left unconnected.