STMicroelectronics 74VHCT373AMTR

Overview

74VHCT373AMTR from STMicroelectronics is an octal non-inverting D-type transparent latch with 3-state outputs, designed for bus-oriented applications requiring bidirectional data flow control and output isolation. It features 6.4 ns typical propagation delay (D to Q), ±8 mA symmetrical output drive, and operates across 4.5–5.5 V supply voltage - used in microcontroller address/data latching and memory interface circuits.

For engineers reviewing the 74VHCT373AMTR datasheet, 74VHCT373AMTR pinout, 74VHCT373AMTR application, or 74VHCT373AMTR equivalent, key selection criteria include latch enable timing (3.5 ns hold time), TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), 3-state output disable time (≤12.0 ns), and ESD immunity (2 kV HBM).

Technical Context

This device implements a dual-control latch architecture: LE (latch enable) determines data transparency vs. latching, while OE (output enable) independently controls 3-state output activation. Inputs accept 0–7 V regardless of VCC, enabling 5 V-to-3 V interfacing without level shifters.

Its C2MOS process delivers low ICC (4 µA max at 25°C) and high latch-up immunity. Propagation delays are balanced (tPLH ≅ tPHL), and output skew is tightly controlled (≤1.0 ns), supporting synchronous bus timing in industrial control and instrumentation systems.

Key Specifications

Pinout & Package

74VHCT373AMTR is supplied in a 20-pin SOIC (SO-20) tape-and-reel package per JEDEC MS-013, with 1.27 mm pitch, 12.6–13.0 mm body width, and 7.4–7.6 mm body length.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74VHCT373MTR and SN74HCT373PW, the 74VHCT373AMTR offers tighter propagation delay control, superior ESD robustness, and optimized thermal dissipation in SOIC - making it preferred for industrial-grade bus latching where reliability and timing precision are critical.

Availability

74VHCT373AMTR is available at Aetrix Electronics and suitable for microcontroller address latching, memory interface buffering, and industrial I/O expansion requiring stable component supply and long-term manufacturability.

Supply support for 74VHCT373AMTR 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 markets since 1987.

The VHCT logic family targets high-speed, low-power 5 V CMOS applications with TTL compatibility - specifically engineered for bus interface, memory addressing, and real-time control systems demanding precise timing and robust noise immunity.

FAQ

What is the maximum clock frequency supported by the 74VHCT373AMTR?

The 74VHCT373AMTR is not a clocked register but a transparent latch controlled by LE. Its usable data rate depends on setup/hold timing: minimum LE pulse width is 6.5 ns, and D-to-LE setup/hold times are 1.5 ns and 3.5 ns respectively. This supports effective bus cycling up to ~80 MHz in well-designed layouts with controlled trace lengths and termination.

Can the 74VHCT373AMTR operate with a 3.3 V supply?

No - the 74VHCT373AMTR is specified only for VCC = 4.5 V to 5.5 V. While inputs tolerate 0–7 V regardless of supply, internal logic and output drive require 5 V operation. For 3.3 V systems, use 74LVC373 or similar 3.3 V–compatible latches.

Is the 74VHCT373AMTR pin-compatible with the 74LS373?

Yes - it is pin- and function-compatible with the 74LS373, including identical SO-20 pinout and truth table behavior. However, it draws significantly less supply current (4 µA vs. ~25 mA), has faster propagation (6.4 ns vs. ~25 ns), and provides 3-state output control with improved noise immunity.

Does the 74VHCT373AMTR require external pull-up resistors on its outputs?

No - the outputs are actively driven high or low in normal state and present high impedance (not floating) when OE is high. Pull-ups are unnecessary unless specific bus-keeper or fail-safe logic states are required, which would be implemented externally per system design needs.