STMicroelectronics 74VHC27MTR

Overview

74VHC27MTR from STMicroelectronics is a triple 3-input NOR gate in high-speed CMOS technology, operating from 2V to 5.5V supply, with 4.1 ns typical propagation delay at 5V, ±8 mA symmetrical output drive, and 2 µA max quiescent ICC at 25°C. It enables logic-level translation between 5V and 3V systems in industrial control and embedded interface circuits.

For engineers reviewing the 74VHC27MTR datasheet, 74VHC27MTR pinout, 74VHC27MTR application, or 74VHC27MTR equivalent, key selection criteria include input voltage tolerance (0–7V independent of VCC), latch-up immunity, ESD protection (2 kV HBM), balanced tPLH/tPHL delays, and SOP-14 package compatibility with legacy 74-series footprints.

Technical Context

The device implements three independent NOR gates using sub-micron C2MOS process with buffer-output stages for noise immunity and stable switching. Inputs accept 0–7V regardless of VCC, enabling robust level-shifting without external biasing.

All inputs feature power-down protection and diode clamping; outputs deliver symmetrical |IOH| = IOL ≥ 8 mA at VCC = 5V, with VIH = 0.7VCC and VIL = 0.3VCC across full temperature range (–55°C to +125°C).

Key Specifications

Pinout & Package

SOP-14 (Small Outline Package, 150 mil width), tape-and-reel format per order code 74VHC27MTR. Pin pitch: 1.27 mm; body dimensions: 8.65 × 3.9 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple 3-input NOR gate applications.

Compared with 74HC27N and SN74LV27APWR, the 74VHC27MTR uniquely balances high speed (4.1 ns), wide supply (2–5.5V), and universal input tolerance (0–7V), making it optimal for retrofitting legacy 74-series systems while supporting modern mixed-voltage architectures.

Availability

74VHC27MTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical diagnostic equipment panels, and test & measurement instrumentation requiring stable component supply and long-term obsolescence management.

Supply support for 74VHC27MTR 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 analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74VHC series targets high-speed, low-power logic applications where compatibility with legacy 74-series footprints and robustness in harsh environments are essential design requirements.

FAQ

Is 74VHC27MTR compatible with 5V TTL inputs?

Yes - its VIH minimum is 0.7VCC (3.5V at VCC = 5V), and it accepts up to 7V on inputs regardless of supply voltage. This ensures reliable recognition of TTL-high (2.4V min) and overvoltage-tolerant operation during bus contention or hot-plug events.

Can 74VHC27MTR operate at 2.5V supply?

Yes - it is fully specified from 2V to 5.5V. At VCC = 2.5V, tPD increases to ~10.5 ns (CL = 15 pF), VOH ≥ 2.3V (IO = –4 mA), and VOL ≤ 0.2V (IO = 4 mA), maintaining functional integrity in low-voltage embedded subsystems.

What is the meaning of "power down protection on inputs"?

This means inputs remain high-impedance and do not source/sink current when VCC = 0V. The internal protection diodes are disabled, preventing backfeeding from powered inputs into an unpowered VCC rail - critical for partial-power-down systems and hot-swap interfaces.

Does 74VHC27MTR require external pull-up or pull-down resistors?

No - unused inputs may be tied directly to VCC or GND. The device has no internal pull-ups; however, its high noise immunity (28% VCC) and low input leakage (<1 µA) allow direct termination without resistive loading, simplifying board design and reducing BOM count.