Nexperia USA Inc. 74AHCT139PW,118

Overview

74AHCT139PW,118 from Nexperia is a dual 2-to-4 line decoder/demultiplexer in TSSOP16 package, operating at 4.5–5.5 V supply with TTL-level inputs and active-low enable (nE) per section. It decodes two binary address inputs (nA0/nA1) into four mutually exclusive active-low outputs (nY0–nY3), supporting both decoding and 1-to-4 demultiplexing functions in industrial control logic and address selection circuits.

For engineers reviewing the 74AHCT139PW,118 datasheet, 74AHCT139PW,118 pinout, 74AHCT139PW,118 application, or 74AHCT139PW,118 equivalent, key selection criteria include TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), propagation delay ≤9.0 ns (VCC = 5.5 V, CL = 15 pF), overvoltage-tolerant inputs up to 5.5 V, and operation across –40 °C to +125 °C.

Technical Context

This device implements two independent 2-to-4 decoders, each with separate address inputs (1A0/1A1, 2A0/2A1), active-low enable (1E/2E), and active-low outputs (1Y0–1Y3, 2Y0–2Y3). The enable inputs serve as data inputs in demultiplexer mode, allowing single-bit routing to one of four outputs per section.

Input logic levels are TTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V), and all inputs tolerate up to 5.5 V regardless of VCC - enabling mixed-voltage interfacing between 3.3 V and 5 V domains without level shifters.

Key Specifications

Pinout & Package

TSSOP16 package (SOT403-1): plastic thin shrink small outline, 16 leads, 4.4 mm body width, 0.65 mm lead pitch, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT139PW,118, the 74HC139PW,118 offers broader supply flexibility but lacks TTL input compatibility, while the SN74LS139DR provides drop-in replacement in vintage designs at the cost of speed, power, and noise margin.

Availability

74AHCT139PW,118 is available at Aetrix Electronics and suitable for memory address decoding, peripheral select logic, LED multiplexing, and test mode selection requiring stable component supply across industrial temperature ranges.

Supply support for 74AHCT139PW,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 optimized for efficiency and miniaturization in industrial and consumer electronics.

The 74AHCT series targets mixed-signal systems requiring TTL-compatible CMOS logic with robust noise immunity and wide temperature operation - specifically designed for reliable address decoding and signal routing in harsh environments.

FAQ

What is the maximum clock/data frequency supported by the 74AHCT139PW,118?

The device does not operate on a clock; it is combinational logic. Its usable frequency depends on propagation delay and load capacitance. With CL = 15 pF and VCC = 5.5 V, tpd ≤ 9.0 ns supports reliable operation up to ~55 MHz toggle rate (1/2×tpd), assuming clean edges and proper termination.

Can 74AHCT139PW,118 be used with a 3.3 V supply?

No - the 74AHCT139 is specified only for 4.5 V to 5.5 V operation. For 3.3 V systems, use the 74AHC139 variant (CMOS input thresholds) or level-shifting circuitry; substituting AHCT at 3.3 V violates recommended operating conditions and risks unreliable VIH recognition.

How does the enable input function in demultiplexer mode?

When used as a 1-to-4 demultiplexer, the enable (nE) becomes the data input: asserting nE LOW passes the decoded state of A0/A1 to the outputs; asserting nE HIGH forces all outputs HIGH. This allows routing a single control bit to one of four destinations based on address.

Is the 74AHCT139PW,118 RoHS compliant and halogen-free?

Yes - Nexperia confirms the 74AHCT139PW,118 meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21, with material declarations available via Nexperia's product change notification (PCN) portal and compliance documentation center.