Nexperia USA Inc. 74AHC573D,118

Overview

74AHC573D,118 from Nexperia is an 8-bit D-type transparent latch with 3-state outputs, used for data latching and bus isolation in digital systems. It features independent latch enable (LE) and output enable (OE) inputs, operates from 2.0 V to 5.5 V, supports -40 °C to +125 °C ambient temperature, and delivers propagation delay as low as 3.9 ns (VCC = 5.0 V, CL = 15 pF). It is commonly deployed in microcontroller I/O expansion, address/data bus buffering, and mixed-voltage level translation.

For engineers reviewing the 74AHC573D,118 datasheet, 74AHC573D,118 pinout, 74AHC573D,118 application, or 74AHC573D,118 equivalent, this device is selected for its overvoltage-tolerant inputs (to 5.5 V), Schmitt-trigger input action, balanced propagation delays, CMOS-level compatibility, and SO20 package suitability for industrial-grade PCB layouts requiring thermal stability and board-level signal integrity.

Technical Context

The 74AHC573D,118 implements eight independent D-type latches with synchronous transparency controlled by a single active-HIGH LE input. Each latch captures data on the falling edge of LE, while OE independently places all eight Q-outputs into high-impedance state without affecting internal latch states.

Its input structure includes Schmitt-trigger action for noise immunity and overvoltage tolerance up to 5.5 V-enabling safe interfacing between 3.3 V logic and 5 V buses. The device complies with JEDEC JESD78 Class II Level A latch-up immunity (>100 mA) and meets HBM ESD >2000 V and CDM >1000 V requirements.

Key Specifications

Pinout & Package

74AHC573D,118 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads. Thermal resistance θJA = 109 °C/W (typical).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT573D,118, the 74AHC573D,118 offers higher noise immunity and wider voltage translation capability but requires ≥3.85 V VIH in 5 V systems; SN74LV573APWR reduces supply headroom and eliminates overvoltage safety-making it unsuitable for bus isolation in heterogeneous voltage domains.

Availability

74AHC573D,118 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body control modules, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHC573D,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, analog, and MOSFET components for automotive, industrial, and consumer applications.

The 74AHC573D,118 belongs to Nexperia's advanced high-speed CMOS logic family, designed specifically for robust data latching and bus isolation in thermally demanding, noise-prone embedded systems.

FAQ

Can 74AHC573D,118 operate reliably at 2.0 V supply?

Yes. The device is fully specified from 2.0 V to 5.5 V, with guaranteed VIH = 1.5 V (min) and VOL ≤ 0.55 V at 4.0 mA load when VCC = 2.0 V. Propagation delay increases to 11.0 ns (max) at CL = 15 pF, but all DC and AC parameters remain valid across the full range.

What is the maximum clock/data frequency supported?

The 74AHC573D,118 does not have a clock input; it is edge-triggered only on LE transitions. Its usable data rate depends on setup/hold times (tsu = 3.5 ns, th = 1.5 ns at VCC = 5 V) and propagation delay (3.9 ns). For reliable latching, input data must be stable ≥3.5 ns before LE HIGH-to-LOW, enabling effective operation up to ~100 MHz in tightly timed systems.

Is the SO20 package RoHS-compliant and lead-free?

Yes. The 74AHC573D,118 in SOT163-1 (SO20) packaging meets RoHS Directive 2011/65/EU and is manufactured with lead-free terminations and halogen-free molding compound, certified per Nexperia's material declarations and IPC-1752A reporting.

How does OE interact with latch state during power-up?

During power-up, OE defaults to HIGH (due to internal weak pull-up), forcing all outputs into high-impedance. The internal latches retain their last state (or random power-on state if unclocked), but outputs remain isolated until OE is actively driven LOW - preventing bus contention before system initialization completes.