STMicroelectronics M74HC139RM13TR

Overview

M74HC139RM13TR from STMicroelectronics is a dual 2-to-4 line decoder/demultiplexer in TSSOP-16 package, operating from 2V to 6V supply, with typical propagation delay of 13ns at 6V, symmetrical output drive (±4mA), and high noise immunity (28% VCC). It serves as address decoder in microcontroller peripheral interfaces and data routing in digital logic systems.

For engineers reviewing the M74HC139RM13TR datasheet, M74HC139RM13TR pinout, M74HC139RM13TR application, or M74HC139RM13TR equivalent, key selection criteria include enable-controlled dual decoding, rail-to-rail input compatibility, guaranteed low-power operation (4μA max ICC), and TSSOP-16 footprint suitability for space-constrained PCB layouts.

Technical Context

The device integrates two independent 2-to-4 decoders, each with active-low enable (1G/2G) and dual address inputs (1A/1B, 2A/2B), supporting demultiplexing when enable acts as data input. Outputs are active-low (Y0–Y3 per section), fully compatible with standard 74-series logic levels and timing.

All inputs feature ESD protection circuits; propagation delays tPLH and tPHL are balanced (tPLH ≅ tPHL), and output impedance is symmetrical (|IOH| = IOL ≥ 4mA), enabling consistent rise/fall times and predictable bus loading in mixed-signal digital systems.

Key Specifications

Pinout & Package

TSSOP-16 package: 4.9 × 6.4 mm body, 0.65 mm pitch, thin-profile surface-mount design optimized for automated assembly and thermal performance in dense layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC139DR and 74LVC139AD, M74HC139RM13TR uniquely balances wide supply range (2–6V), extended temperature support (–55°C to +125°C), and compact TSSOP-16 packaging - making it optimal for automotive body control modules and ruggedized industrial controllers where voltage flexibility and thermal resilience are mandatory.

Availability

M74HC139RM13TR is available at Aetrix Electronics and suitable for memory address decoding, peripheral chip select logic, LED segment driver enable, and test equipment signal routing requiring stable component supply and long-term lifecycle assurance.

Supply support for M74HC139RM13TR 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.

M74HC139RM13TR belongs to the M74HC high-speed CMOS logic family, engineered for low-power, high-noise-immunity digital interfacing in resource-constrained and thermally demanding applications.

FAQ

Is M74HC139RM13TR pin-compatible with 74LS139?

Yes - M74HC139RM13TR uses identical pinout and logic function as 74LS139, including active-low enables and outputs. However, its CMOS input structure draws negligible DC current versus LS TTL's input loading, eliminating need for pull-up resistors on unused inputs.

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

At VCC = 6V and fIN = 1MHz, the device maintains specified timing with CL ≤ 50pF (per AC test condition). Driving >50pF loads increases propagation delay and may cause marginal timing - add series termination or buffer stages for loads exceeding 75pF.

Can both decoder sections operate independently with different enable signals?

Yes - 1G and 2G are electrically isolated control inputs. Applying logic LOW to 1G activates only decoder 1 (pins 1A/1B → 1Y0–1Y3), while 2G controls decoder 2 (13/14 → 9–12), enabling asynchronous peripheral selection in multi-master systems.

Does this part require external pull-up resistors on outputs?

No - outputs are push-pull CMOS with full rail-to-rail swing. Pull-ups are unnecessary unless interfacing with open-drain systems or implementing wired-OR logic; in standard 74HC/74HCT environments, direct connection to downstream inputs is fully compliant.