NXP Semiconductors 74AHCT574PW,112

Overview

74AHCT574PW,112 from Nexperia is an octal positive-edge-triggered D-type flip-flop with 3-state non-inverting outputs, designed for bus-oriented data latching in 5 V TTL-compatible systems. It operates from 4.5 V to 5.5 V, features 3.0 ns minimum clock pulse width, 3.0 ns setup time, and 1.5 ns hold time at VCC = 5 V, and supports industrial temperature range (−40 °C to +125 °C) in TSSOP20 package.

For engineers reviewing the 74AHCT574PW,112 datasheet, 74AHCT574PW,112 pinout, 74AHCT574PW,112 application, or 74AHCT574PW,112 equivalent, this device serves as a high-speed, low-power 8-bit register for microcontroller peripheral interfacing, memory address latching, and bidirectional bus isolation where TTL-level compatibility and precise edge-triggered capture are required.

Technical Context

This device implements eight independent D-type flip-flops synchronized to the LOW-to-HIGH transition of the CP input, with asynchronous 3-state control via active-LOW OE. Each flip-flop samples its D-input only on the clock edge, satisfying set-up/hold timing relative to that edge - not level-sensitive sampling.

The 74AHCT574 variant uses TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), enabling direct interfacing with legacy 5 V TTL logic without level translation. Its overvoltage-tolerant inputs (up to 5.5 V) allow safe operation in mixed-voltage environments even when VCC is nominal.

Key Specifications

Pinout & Package

TSSOP20 (SOT360-1) package: 20-pin plastic thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, lead-free, RoHS-compliant, thermal performance rated for continuous operation at −40 °C to +125 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT574PW,112, the SO20 variant trades compactness for easier handling and thermal margin, while the TI version offers identical functionality with alternate supply-chain assurance - neither alters timing, voltage, or logic behavior in standard 5 V bus applications.

Availability

74AHCT574PW,112 is available at Aetrix Electronics and suitable for microcontroller bus interface, memory address latching, and industrial I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHCT574PW,112 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

Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial, consumer, and communications applications.

The 74AHCT series targets 5 V TTL-compatible digital systems requiring robust noise immunity, precise edge-triggered timing, and seamless integration with legacy and modern logic families - especially where bus loading, power efficiency, and wide temperature operation are critical.

FAQ

What is the minimum clock pulse width required for reliable operation?

The minimum HIGH and LOW pulse width for CP is 5.0 ns at VCC = 4.5–5.5 V and CL = 50 pF. This ensures sufficient time for internal clock path propagation and flip-flop state capture without metastability. Pulse widths below this value risk incomplete triggering or skipped edges, particularly under worst-case voltage and temperature conditions.

Can 74AHCT574PW,112 operate with a 3.3 V supply?

No - the 74AHCT574 variant is specified only for 4.5 V to 5.5 V supply. At 3.3 V, input thresholds (VIH = 2.0 V min) may not be met reliably, and output drive strength degrades significantly. For 3.3 V systems, use the 74AHC574PW variant, which supports 2.0–5.5 V and CMOS input levels.

How does the OE pin interact with the internal flip-flop states?

The OE pin controls only the output buffer impedance and has no effect on the internal flip-flop states. When OE is HIGH, Q0–Q7 enter high-impedance mode while stored D-input values remain intact in each flip-flop. This allows concurrent data capture and bus release without resetting or losing latched data.

Is the TSSOP20 package suitable for reflow soldering in high-volume manufacturing?

Yes - the SOT360-1 (TSSOP20) package is qualified for standard lead-free reflow profiles (J-STD-020, MSL1). Its 0.65 mm pitch, exposed thermal pad (non-electrical), and lead-free terminations support automated placement and convection reflow. Recommended preheat ramp rate is ≤3 °C/s and peak temperature 260 °C for ≤30 s.