STMicroelectronics 74VHC373MTR

Overview

74VHC373MTR from STMicroelectronics is an advanced high-speed CMOS octal D-type transparent latch with 3-state non-inverting outputs, fabricated in sub-micron C2MOS technology. It features 8-bit data latching controlled by LE (latch enable) and OE (output enable), operates from 2V to 5.5V, delivers 5.0 ns typical propagation delay at 5V, supports 8 mA output drive, and provides input voltage tolerance up to 7V for 5V/3V interface bridging.

For engineers reviewing the 74VHC373MTR datasheet, 74VHC373MTR pinout, 74VHC373MTR application, or 74VHC373MTR equivalent, key selection considerations include its symmetrical output impedance, latch-enable timing margins (ts = 4.0 ns, th = 1.0 ns), power-down input protection, 2 kV ESD immunity, and compatibility with legacy 74-series bus-hold and address/data latching systems.

Technical Context

This device implements a dual-control transparent latch architecture: LE governs data capture (Q follows D when LE = HIGH; Q holds when LE transitions LOW), while OE independently controls output state (LOW = active logic, HIGH = high-impedance). Its input structure accepts 0–7 V regardless of VCC, enabling robust level-shifting between 5 V and 3 V domains without external circuitry.

All eight latches share common LE and OE signals, and each output exhibits matched tPLH/tPHL delays (≤10.5 ns max at 5 V, CL = 50 pF) and low skew (≤1.0 ns). The design integrates on-chip protection diodes, 4 µA max ICC at 25°C, and guaranteed latch-up immunity per JEDEC JESD78.

Key Specifications

Pinout & Package

74VHC373MTR is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, tape-and-reel packaging (MTR suffix), and standard JEDEC MS-013AC dimensions (D = 12.6–13.0 mm, E = 7.4–7.6 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LCX373MTR and SN74LVTH373PW, the 74VHC373MTR uniquely combines 2–5.5 V operation, 7 V input tolerance, and 4 µA quiescent current-making it the only option among the three suitable for mixed-voltage, low-power, and fault-tolerant industrial bus interfaces.

Availability

74VHC373MTR is available at Aetrix Electronics and suitable for microcontroller bus interfacing, address latching for memory expansion, and industrial I/O expansion requiring stable component supply across extended temperature ranges and mixed-voltage environments.

Supply support for 74VHC373MTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for automotive, industrial, and consumer applications with emphasis on reliability, energy efficiency, and system integration.

The 74VHC series targets high-speed, low-power logic in space-constrained and thermally demanding applications, with the 74VHC373 specifically engineered for robust bus buffering and level-translating latching in mixed-voltage embedded systems.

FAQ

Can 74VHC373MTR operate safely with VCC = 0 V while inputs are at 5 V?

Yes. Its inputs feature power-down protection that allows −0.5 V to +7.0 V regardless of VCC state. When VCC = 0 V, no current flows into or out of inputs, preventing damage or unintended logic states. This enables hot-plug and partial-power-down scenarios without external clamping.

What is the minimum pulse width required on the LE input to reliably capture data?

The minimum LE HIGH pulse width is 5.0 ns at VCC = 5.0 V (per Table 7). This ensures setup and hold timing margins are met for D-to-LE transitions. Shorter pulses may result in metastability or incomplete latching, especially under worst-case voltage and temperature conditions.

Does 74VHC373MTR support live insertion or hot swapping on a powered bus?

Yes. With 2 kV HBM ESD rating, 7 V input tolerance, and power-down protection, it can be inserted into a live 5 V bus without damaging the device or disturbing other components. However, OE must be held HIGH during insertion to keep outputs in high-Z until initialization completes.

How does the 74VHC373MTR differ from standard 74HC373 in terms of performance?

The 74VHC373MTR offers faster propagation delay (5.0 ns vs. ~15 ns for 74HC373 at 5 V), lower ICC (4 µA vs. ~40 µA), improved noise immunity (28% VCC vs. 30% VCC), and enhanced latch-up resistance due to sub-micron C2MOS process. It also supports wider VCC range (2–5.5 V vs. 2–6 V) with tighter DC specs.