Nexperia USA Inc. 74HCT373D-Q100,118

Overview

74HCT373D-Q100 from Nexperia is an automotive-qualified octal D-type transparent latch with 3-state outputs, designed for bus-oriented data latching in vehicle control modules. It operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, features TTL-compatible inputs, and delivers 17 ns typical propagation delay (D→Q) at VCC = 4.5 V with CL = 50 pF - enabling reliable interface between microcontrollers and peripheral buses in ADAS domain controllers.

For engineers reviewing the 74HCT373D-Q100 datasheet, 74HCT373D-Q100 pinout, 74HCT373D-Q100 application, or 74HCT373D-Q100 equivalent, this device serves as a high-reliability, AEC-Q100 Grade 1–qualified latch for automotive bus buffering, ECU input capture, and sensor data staging where deterministic timing, 3-state bus isolation, and extended temperature stability are required.

Technical Context

This device implements eight independent D-type latches with shared LE (latch enable, active HIGH) and OE (output enable, active LOW) controls. Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V) ensure compatibility with legacy 5 V logic families while maintaining CMOS power efficiency. The latch behavior is edge-triggered on LE's HIGH-to-LOW transition for data capture, with transparency during LE HIGH.

Each output drives up to ±6.0 mA at VCC = 4.5 V with VOL ≤ 0.26 V and VOH ≥ 3.98 V, and transitions into high-impedance (Z) state within 32 ns of OE assertion. Input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors - critical for mixed-voltage subsystems in modern vehicle architectures.

Key Specifications

Pinout & Package

74HCT373D-Q100 uses the SO20 (SOT163-1) package: plastic small outline, 20 leads, 7.5 mm body width, with gull-wing leads and standard 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT373PW-Q100 and SN74HCT373QPWRQ1, the 74HCT373D-Q100 offers superior thermal robustness in high-power-density layouts due to SO20's higher Ptot derating threshold, while maintaining identical timing and interface behavior - making it optimal for under-hood modules where sustained 125 °C operation is routine.

Availability

74HCT373D-Q100 is available at Aetrix Electronics and suitable for engine control units, ADAS camera interfaces, and body control modules requiring stable component supply across automotive production lifecycles.

Supply support for 74HCT373D-Q100 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 essential semiconductors for automotive, industrial, and consumer markets, delivering high-reliability discrete and logic devices.

The 74HCT373-Q100 series belongs to Nexperia's automotive-qualified logic portfolio, engineered specifically for robust bus interfacing in harsh-temperature vehicle subsystems where latch integrity and noise immunity are non-negotiable.

FAQ

What is the maximum clock frequency supported by the 74HCT373D-Q100?

The 74HCT373D-Q100 does not operate on a clock signal; it is a transparent latch controlled by the LE (latch enable) input. Its usable data rate is governed by propagation delay (17 ns typ D→Q at VCC = 4.5 V) and setup/hold times (12 ns su/th min). For reliable operation with clean edges, the effective maximum toggle rate on LE is approximately 12 MHz under worst-case timing conditions.

Can the 74HCT373D-Q100 interface directly with 3.3 V microcontrollers?

No - the 74HCT373D-Q100 requires VCC = 4.5 V to 5.5 V and has TTL-level inputs (VIH ≥ 2.0 V), but its outputs swing rail-to-rail (VOH ≈ VCC). Driving a 3.3 V MCU input directly risks overvoltage damage. A level-shifter or resistor divider is required on Qn outputs, or use the 74LVC373A-Q100 for native 3.3 V compatibility.

How does the latch behavior differ between LE HIGH and LE LOW states?

When LE is HIGH, the device is transparent: Qn follows Dn in real time (with propagation delay). When LE transitions HIGH-to-LOW, the instantaneous Dn values are captured and held. Subsequent Dn changes have no effect until LE returns HIGH. This dual-mode operation enables both real-time monitoring and snapshot capture in automotive diagnostics.

Is the GND pad on the SO20 package (pin 10) required to be soldered?

Yes - pin 10 is the functional ground connection and must be soldered to the PCB ground plane. Unlike exposed thermal pads in QFN packages, this is a standard leadframe GND pin; omitting the solder joint will cause functional failure due to missing reference potential and excessive noise susceptibility.