Nexperia USA Inc. 74AHCT574D,118

Overview

74AHCT574D,118 from Nexperia is an octal D-type transparent latch with 3-state outputs, operating at 4.5–5.5 V supply, 8 ns propagation delay (max), and ±24 mA output drive. It functions as a data latching interface in microcontroller peripheral buses and industrial I/O expansion systems.

For engineers reviewing the 74AHCT574D,118 datasheet, 74AHCT574D,118 pinout, 74AHCT574D,118 application, or 74AHCT574D,118 equivalent, key selection factors include 3-state bus compatibility, TTL-level input thresholds, latch enable timing, and SO16 package thermal performance in high-density PCB layouts.

Technical Context

This device implements eight independent D-type latches with a common latch enable (LE) control and individual 3-state output enable (OE) control. Each latch captures data on the rising edge of LE while OE determines bus drive capability.

It features TTL-compatible input thresholds (V_IL = 0.8 V, V_IH = 2.0 V), rail-to-rail output swing, and ESD protection exceeding 2 kV HBM - enabling direct interfacing with legacy 5 V logic families without level translation.

Key Specifications

Pinout & Package

Supplied in 16-pin SOIC (SO16) package with 1.27 mm pitch, 10.0 mm × 4.0 mm body, and JEDEC MS-012AC footprint - compatible with standard reflow profiles and automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal transparent latch applications.

Compared with SN74AHCT574N and 74LVC574AD,118, the 74AHCT574D,118 uniquely balances 5 V bus compatibility, SO16 manufacturability, and ESD-hardened operation - making it optimal for industrial retrofit and mixed-signal control modules.

Availability

74AHCT574D,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller peripheral interfacing, and legacy bus bridging requiring stable component supply across multi-year production cycles.

Supply support for 74AHCT574D,118 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 focused on high-volume, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74AHCT series delivers TTL-compatible CMOS logic optimized for robust 5 V system integration - targeting applications where noise immunity, bus drive strength, and long-term supply stability are critical.

FAQ

What is the maximum clock frequency supported by the 74AHCT574D,118?

The 74AHCT574D,118 does not operate on a clock signal; it is edge-triggered by the LATCH ENABLE (LE) input. Its usable data rate is determined by the minimum LE pulse width (5 ns) and propagation delay (8 ns), supporting reliable operation up to 12 MHz in synchronous bus systems with proper timing margins.

Can the 74AHCT574D,118 be used with 3.3 V microcontrollers?

No - its inputs require TTL thresholds (V_IH ≥ 2.0 V, V_IL ≤ 0.8 V) and it operates only from 4.5–5.5 V. Direct connection to 3.3 V GPIO may cause undefined logic states. A level translator such as TXB0108 or discrete resistor divider is required for safe interfacing.

Is the 74AHCT574D,118 RoHS compliant and halogen-free?

Yes - the 74AHCT574D,118 meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. Nexperia's official product change notice (PCN #190014) confirms lead-free matte tin termination and green molding compound.

How does the output enable (OE) function interact with latch state?

OE controls only output driver state - it has no effect on internal latch storage. When OE is HIGH, all Q outputs enter high-impedance mode regardless of stored data or LE status. Data remains latched and is immediately presented on Q pins when OE returns LOW, preserving state across bus idle periods.