STMicroelectronics 74VHCT32ATTR

Overview

74VHCT32ATTR from STMicroelectronics is a high-speed CMOS quad 2-input OR gate in TSSOP-14 package, operating at 4.5–5.5 V, with 5 ns typical propagation delay, ±8 mA output drive, and TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V). It enables logic-level translation between 5 V and 3 V systems in industrial control and embedded interface circuits.

For engineers reviewing the 74VHCT32ATTR datasheet, 74VHCT32ATTR pinout, 74VHCT32ATTR application, or 74VHCT32ATTR equivalent, key selection criteria include propagation delay symmetry (tPLH ≅ tPHL), power-down input/output protection, ESD immunity (2 kV), and guaranteed 8 mA output sink/source capability under full temperature range (–55°C to +125°C).

Technical Context

The 74VHCT32ATTR implements four independent OR gates using sub-micron C2MOS technology with three-stage buffered outputs, delivering high noise immunity and stable switching. Its inputs accept 0–7 V regardless of VCC, enabling robust hot-swap and mixed-voltage interfacing.

All inputs and outputs feature diode-based ESD protection (±2 kV HBM), and the device guarantees symmetrical output impedance (|IOH| = IOL ≥ 8 mA) and balanced propagation delays (tPLH/tPHL ≤ 1.1× variation) across –55°C to +125°C.

Key Specifications

Pinout & Package

TSSOP-14 (Thin Shrink Small Outline Package), 4.4 mm × 5.0 mm body, 0.65 mm pitch, lead-free and RoHS compliant per STMicroelectronics specification.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input OR gate applications.

Compared with SN74VHCT32PW, the 74VHCT32ATTR offers identical performance but different qualification history; versus 74VHC32TTR, it provides essential TTL threshold compatibility and 5 V input tolerance-critical for mixed-voltage industrial designs.

Availability

74VHCT32ATTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, medical infusion pump UI logic, and test equipment signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74VHCT32ATTR 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, designing and manufacturing microcontrollers, power ICs, sensors, and logic devices for industrial, automotive, and consumer markets.

The VHCT logic family targets high-speed, low-power 5 V digital interfacing with TTL compatibility and enhanced robustness-designed specifically for industrial control, automotive electronics, and medical equipment where reliability across wide temperature and voltage margins is mandatory.

FAQ

Is 74VHCT32ATTR compatible with 3.3 V microcontroller outputs?

Yes. Its TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) ensure reliable recognition of 3.3 V logic HIGH/LOW levels. The inputs tolerate up to 7 V regardless of VCC, allowing direct connection without level shifters in mixed-voltage systems.

What is the maximum operating temperature range for continuous use?

The 74VHCT32ATTR is rated for continuous operation from –55°C to +125°C under recommended conditions (VCC = 4.5–5.5 V). This range is validated per STMicroelectronics' industrial qualification standards and applies to both SO-14 and TSSOP-14 packages.

Does this device require external pull-up or pull-down resistors on unused inputs?

No. Unused inputs may be tied directly to VCC or GND. The device features internal input protection and no floating-input sensitivity; however, tying to defined rails is still recommended to minimize noise coupling and ensure predictable logic states in high-noise environments.

Can 74VHCT32ATTR drive a 50 Ω transmission line directly?

It can drive short 50 Ω lines (≤5 cm) at moderate frequencies due to its 8 mA output capability, but for reliable signal integrity beyond 10 MHz, an external series resistor (22–33 Ω) is recommended to dampen reflections. Full 50 Ω termination should be implemented at the receiver end.