Nexperia USA Inc. 74ALVC373D,118

Overview

74ALVC373D,118 from Nexperia is an octal D-type transparent latch with 3-state outputs, designed for data latching and bus isolation in digital systems. It features independent latch enable (LE) and output enable (OE) controls, operates from 1.65 V to 3.6 V, supports -40 °C to +125 °C ambient range, and includes IOFF circuitry for partial power-down protection. It is used in address/data bus buffering in microcontroller-based industrial control modules.

For engineers reviewing the 74ALVC373D,118 datasheet, 74ALVC373D,118 pinout, 74ALVC373D,118 application, or 74ALVC373D,118 equivalent, key selection criteria include its 20-pin SO20 package, 3.3 ns max propagation delay at 3.3 V, Schmitt-trigger input tolerance, IOFF-enabled power-down safety, and compatibility with mixed-voltage TTL/CMOS interfaces.

Technical Context

The device implements eight independent D-type latches with transparent mode when LE is HIGH and edge-triggered capture on LE HIGH-to-LOW transition. Each latch output drives a 3-state buffer controlled separately by OE (active LOW), enabling bidirectional bus sharing without affecting internal latch state.

Schmitt-trigger inputs ensure robust operation with slow-rising signals, while the IOFF circuit disables outputs and blocks backflow current when VCC = 0 V - critical for hot-swap and multi-rail system designs requiring live insertion or partial power sequencing.

Key Specifications

Pinout & Package

74ALVC373D,118 is supplied in a plastic small outline package (SO20, SOT163-1) with 20 leads, 7.5 mm body width, and standard 1.27 mm lead pitch. Pin 1 is marked by a notch or dot; pin 10 is GND and pin 20 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC373APWR and 74LVCH16373ADGG, the 74ALVC373D,118 uniquely combines full -40 °C to +125 °C qualification, IOFF-enabled safe power-down, and compact SO20 packaging - making it the only option for thermally demanding, hot-pluggable, or fail-safe embedded systems.

Availability

74ALVC373D,118 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, medical device signal conditioning, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ALVC373D,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 delivering high-performance, reliable logic, discrete, and MOSFET solutions optimized for efficiency, miniaturization, and robustness in high-volume applications.

The 74ALVC series targets advanced low-voltage digital interfacing where wide supply tolerance, low dynamic power, and rugged I/O are essential - especially in portable, automotive, and industrial systems with aggressive thermal and reliability constraints.

FAQ

What is the minimum recommended VCC for reliable operation of 74ALVC373D,118?

The absolute minimum supply voltage is 1.65 V per JEDEC JESD8-7 compliance. Below this, input thresholds and output drive fall outside specification: VIH drops below 0.65×VCC, and VOL exceeds 0.35 V at 6 mA load. Operation at 1.6 V may cause metastability or bus contention and is not guaranteed.

Can OE and LE be tied together for simplified control?

No - OE is active LOW and LE is active HIGH, so tying them directly causes functional conflict: asserting OE disables outputs while LE HIGH enables transparency, resulting in undefined or non-latching behavior. Separate control is mandatory for correct latch-and-hold or bus-isolation sequences.

Does 74ALVC373D,118 support hot insertion when VCC = 0 V?

Yes - the IOFF circuit actively disables outputs and limits backflow current to ±10 μA when VCC = 0 V, satisfying IEC 61000-4-2 Level 4 ESD immunity during live insertion. However, mechanical mating sequence (GND first, VCC last) remains critical to avoid latch-up during connector engagement.

How does Schmitt-trigger input action improve noise immunity on LE and OE pins?

Schmitt-trigger inputs provide ~0.3 V hysteresis, meaning LE must rise above ~1.9 V (at VCC = 3.3 V) to register HIGH and fall below ~1.6 V to register LOW. This prevents chatter-induced false latching or output toggling from noise spikes <0.3 V peak-to-peak on control lines, eliminating need for external RC filtering.