STMicroelectronics 74VHCT02ATTR

Overview

74VHCT02ATTR from STMicroelectronics is a quad 2-input NOR gate IC in TSSOP-14 package, operating at 4.5–5.5 V, with 5 ns typical propagation delay, ±8 mA symmetrical 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 74VHCT02ATTR datasheet, 74VHCT02ATTR pinout, 74VHCT02ATTR application, or 74VHCT02ATTR equivalent, key selection criteria include propagation delay matching, input voltage tolerance up to 7 V, power-down protection on all I/Os, ESD immunity (2 kV), and compatibility with legacy 74-series logic footprints.

Technical Context

This device implements four independent NOR gates using sub-micron C2MOS technology with three-stage buffered outputs for high noise immunity. Each gate features identical input threshold behavior (TTL-compatible) and symmetrical output impedance (|IOH| = |IOL| ≥ 8 mA).

Inputs accept voltages from –0.5 V to 7.0 V regardless of VCC, enabling robust hot-swap and mixed-voltage interfacing. Power-down protection ensures safe operation during supply sequencing or brown-out conditions without latch-up risk.

Key Specifications

Pinout & Package

TSSOP-14 (Thin Shrink Small Outline Package), 0.65 mm pitch, 5.0 × 6.4 mm body size, 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 NOR gate applications.

Compared with SN74VHC02DR and 74LCX02MTCX, the 74VHCT02ATTR uniquely supports true 5 V TTL interfacing with 7 V input tolerance and guaranteed 8 mA drive - making it the sole option for retrofitting legacy 7402-based designs without circuit redesign.

Availability

74VHCT02ATTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and medical diagnostic instrument logic requiring stable component supply and long-term lifecycle support.

Supply support for 74VHCT02ATTR 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 and longevity.

The VHCT logic family was designed specifically for TTL-to-CMOS translation in legacy system upgrades, combining 5 V operation, robust input tolerance, and low power consumption without sacrificing speed.

FAQ

Is the 74VHCT02ATTR compatible with 3.3 V input signals?

Yes - its TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) allow reliable recognition of 3.3 V logic HIGH and LOW levels. However, inputs tolerate up to 7 V regardless of VCC, enabling safe operation even with overshoot or mixed-supply coupling.

What is the maximum capacitive load this device can drive reliably?

The 74VHCT02ATTR is characterized up to 50 pF load capacitance with 5 ns typical propagation delay. Driving >50 pF increases tPD nonlinearly and may exceed VOL/VOLP limits; for heavier loads, add series termination or buffer stages per STMicroelectronics AN2012 guidelines.

Does this part support partial power-down operation?

Yes - all inputs and outputs feature power-down protection, allowing VCC to be removed while inputs remain at valid logic levels (0–7 V) without back-driving or latch-up. This enables safe hot-swap and supply sequencing in modular systems.

Can the 74VHCT02ATTR replace a standard 7402 in existing PCBs?

Yes - it is pin- and function-compatible with the 7402, uses the same TSSOP-14 footprint, and matches TTL input thresholds. No layout changes are needed, though decoupling capacitor placement should follow CMOS best practices for noise suppression.