STMicroelectronics 74VHC139MTR

Overview

74VHC139MTR from STMicroelectronics is a dual 2-to-4 line decoder/demultiplexer in high-speed CMOS technology, featuring 5.0 ns typical propagation delay at 5V, ±8 mA symmetrical output drive, and 2V–5.5V operating voltage range. It supports 5V-to-3V interfacing with input tolerance up to 7V and is used in address decoding for memory subsystems and data routing in microcontroller peripheral expansion.

For engineers reviewing the 74VHC139MTR datasheet, 74VHC139MTR pinout, 74VHC139MTR application, or 74VHC139MTR equivalent, key selection criteria include enable-controlled demux operation, latch-up immunity, ESD-hardened I/O (2 kV), power-down input protection, and compatibility with legacy 74-series logic timing and footprint.

Technical Context

The device integrates two independent 2-to-4 decoders, each with active-low enable (1G/2G) and complementary address inputs (A/B). Enable gating enables use as a 1-to-4 demultiplexer where G serves as data input and A/B as select lines.

All inputs tolerate 0–7 V regardless of VCC, enabling robust level translation. Outputs exhibit balanced tPLH/tPHL delays and symmetrical |IOH| = |IOL| ≥ 8 mA drive capability across –55°C to +125°C, supporting mixed-voltage system interconnects without external level shifters.

Key Specifications

Pinout & Package

74VHC139MTR is housed in a 16-pin SOP (Small Outline Package) with 1.27 mm pitch, JEDEC MS-012 compliant, tape-and-reel format (MTR suffix). Package dimensions: 9.8–10.0 mm × 5.8–6.2 mm × 1.75 mm height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 2-to-4 decoder applications.

Compared with 74HC139D and SN74LV139ADR, the 74VHC139MTR uniquely combines 5 ns speed, 7 V input tolerance, and ±8 mA drive - making it optimal for mixed-voltage industrial control where signal integrity and robustness are non-negotiable.

Availability

74VHC139MTR is available at Aetrix Electronics and suitable for memory address decoding, peripheral selection logic, LED segment driver control, and industrial I/O multiplexing requiring stable component supply across automotive, industrial automation, and medical equipment programs.

Supply support for 74VHC139MTR 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 logic family targets high-speed, low-power, and robust interface solutions for legacy-compatible digital systems - emphasizing noise immunity, wide supply range, and enhanced reliability over standard HC variants.

FAQ

Can 74VHC139MTR operate with VCC = 3.3 V and interface to 5 V inputs?

Yes. Its inputs tolerate –0.5 V to +7.0 V regardless of VCC, allowing direct connection to 5 V signals while powered from 3.3 V. Output high-level voltage (VOH) reaches ~3.2 V at 4 mA load, sufficient to drive 74VHC or 74LCX inputs reliably.

What is the maximum capacitive load this device can drive without exceeding timing specs?

AC specifications are guaranteed for CL = 15 pF and CL = 50 pF loads. At 5 V, tPLH/tPHL increases from 5.0 ns (15 pF) to 6.5 ns (50 pF). For loads >50 pF, propagation delay rises nonlinearly; derating or buffer insertion is recommended above 75 pF.

Does the 74VHC139MTR require external pull-up resistors on its outputs?

No. Outputs are push-pull CMOS and actively drive both high and low states. Pull-ups are unnecessary unless open-collector emulation or wired-OR logic is specifically required - which this device does not support natively.

How does the power-down protection work on input pins?

Each input includes clamping diodes to VCC and GND plus current-limiting structures. When VCC = 0 V, inputs accept –0.5 V to +7.0 V safely without injecting current into the supply rail or causing latch-up, enabling hot-plug and partial-power-down system architectures.