Nexperia USA Inc. 74AHC139PW,118

Overview

74AHC139PW,118 from Nexperia is a dual 2-to-4 line decoder/demultiplexer in TSSOP16 package, operating from 2.0 V to 5.5 V supply, featuring overvoltage-tolerant inputs (up to 5.5 V), Schmitt-trigger inputs for noise immunity, and -40 °C to +125 °C temperature range. It implements two independent decoders, each with active-low enable (nE) and binary address inputs (nA0, nA1), driving four mutually exclusive active-low outputs (nY0–nY3). Used in address decoding for memory expansion and I/O port selection in industrial microcontroller systems.

For engineers reviewing the 74AHC139PW,118 datasheet, 74AHC139PW,118 pinout, 74AHC139PW,118 application, or 74AHC139PW,118 equivalent, key selection criteria include CMOS-level input compatibility, propagation delay under 9.0 ns at 5 V/50 pF load, output drive capability of ±8 mA, thermal performance up to +125 °C, and pin-compatible drop-in replacement options for legacy 74-series logic upgrades.

Technical Context

This device integrates two independent 2-to-4 decoders on a single die, each accepting two binary address inputs and one active-low enable signal to select one of four active-low outputs. The enable input doubles as data input in demultiplexer mode, allowing 1-to-4 signal routing without external gating.

All inputs tolerate voltages up to 5.5 V regardless of VCC, enabling mixed-voltage interfacing (e.g., 3.3 V logic controlling 5 V peripherals). Schmitt-trigger action on all inputs ensures robust noise rejection with hysteresis of typically 0.3 V at VCC = 5 V.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1), 16-pin, body width 4.4 mm, 0.65 mm pitch, lead finish matte tin, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHC139PW,118, the 74AHCT139PW,118 offers TTL-compatible inputs for legacy integration, while SN74LV139APWR extends low-voltage operation but sacrifices overvoltage resilience-making the AHC variant optimal for mixed-supply industrial interfaces requiring robustness and noise immunity.

Availability

74AHC139PW,118 is available at Aetrix Electronics and suitable for memory address decoding, I/O port expansion, industrial control logic, and legacy system interface applications requiring stable component supply across extended temperature ranges and mixed-voltage environments.

Supply support for 74AHC139PW,118 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

Nexperia is a global semiconductor expert delivering high-performance, reliable logic, analog, and MOSFET solutions with leadership in efficiency, miniaturization, and quality for industrial, computing, and consumer markets.

The 74AHC logic family targets high-speed, low-power, mixed-voltage digital interfacing applications, emphasizing robustness, wide supply range, and compatibility with modern and legacy logic families.

FAQ

Can 74AHC139PW,118 operate with a 2.5 V supply?

Yes. The 74AHC139PW,118 is fully specified from 2.0 V to 5.5 V. At VCC = 2.5 V, VIH is guaranteed ≥1.7 V and VIL ≤0.8 V, with typical propagation delay of 11.0 ns (CL = 15 pF). Output drive remains functional at ±4 mA, supporting direct interface with 2.5 V logic families.

Is the 74AHC139PW,118 pin-compatible with the 74LS139?

Yes - both devices use identical TSSOP16 pinout (SOT403-1) and share the same functional diagram, truth table, and enable/address/output signal assignments. However, the AHC version replaces bipolar inputs with CMOS, eliminating DC input current and improving noise immunity without requiring external pull-ups.

What is the maximum capacitive load the outputs can drive reliably?

The outputs are rated for 50 pF load capacitance per channel at VCC = 4.5–5.5 V, with guaranteed tpd ≤10.5 ns and VOL ≤0.55 V at IO = 8 mA. Driving >50 pF requires external buffer amplification or reduced slew rate control to maintain timing integrity and avoid ringing.

Does the 74AHC139PW,118 support hot insertion?

No. While inputs are overvoltage tolerant up to 5.5 V, the device lacks explicit hot-swap protection features such as power-on reset, undervoltage lockout, or controlled slew-rate outputs. Hot insertion may cause bus contention or transient latch-up if VCC ramps after signal application.