Nexperia USA Inc. 74AHC138PW-Q100J

Overview

74AHC138PW-Q100 from Nexperia is an automotive-grade 3-to-8 line inverting decoder/demultiplexer in TSSOP16 package, operating from 2.0 V to 5.5 V with propagation delay as low as 4.4 ns (VCC = 5.0 V, CL = 15 pF), Schmitt-trigger inputs, and AEC-Q100 Grade 1 qualification for use in engine control units and body electronics.

For engineers reviewing the 74AHC138PW-Q100 datasheet, 74AHC138PW-Q100 pinout, 74AHC138PW-Q100 application, or 74AHC138PW-Q100 equivalent, key selection criteria include its dual enable architecture (E1/E2 active LOW, E3 active HIGH), 8 mutually exclusive active-LOW outputs, CMOS-level compatibility, -40 °C to +125 °C operation, and TSSOP16 footprint for space-constrained automotive PCBs.

Technical Context

This device implements a 3-input binary address decoder with three independent enable controls: two active-LOW (E1, E2) and one active-HIGH (E3). All eight outputs (Y0–Y7) are asserted LOW only when E1 = E2 = LOW and E3 = HIGH, enabling precise hierarchical decoding in memory and peripheral selection.

It supports demultiplexing by routing data through an enable input while using address lines for channel selection, and features Schmitt-trigger inputs for noise immunity on slow or noisy control signals - critical in automotive harness environments where signal integrity is compromised by EMI and ground bounce.

Key Specifications

Pinout & Package

TSSOP16 package (SOT403-1), 4.4 mm body width, 0.65 mm pitch, 16-terminal surface-mount outline with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-to-8 decoder applications.

Compared with 74AHCT138PW-Q100 and SN74LV138APWREP, the 74AHC138PW-Q100 offers superior noise immunity via Schmitt-trigger inputs and wider VCC tolerance (2.0–5.5 V), making it optimal for harsh automotive environments where signal integrity and supply variation are primary concerns.

Availability

74AHC138PW-Q100 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera interfaces, and electric power steering systems requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.

Supply support for 74AHC138PW-Q100 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 leading semiconductor manufacturer headquartered in Nijmegen, Netherlands, specializing in high-performance, high-reliability logic, analog, and discrete components for automotive, industrial, and consumer markets.

The 74AHC138PW-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically to meet stringent AEC-Q100 requirements and deliver robust, low-power decoding functionality in safety-critical vehicle subsystems.

FAQ

What is the maximum clock frequency supported by the 74AHC138PW-Q100?

The 74AHC138PW-Q100 is not a clocked device and has no internal clock; its maximum usable switching rate is determined by propagation delay and load capacitance. With CL = 15 pF and VCC = 5.0 V, tpd = 4.4 ns (typ), supporting address changes up to ≈100 MHz in burst-mode applications - limited only by external timing margins and PCB routing.

Can the 74AHC138PW-Q100 be used as a demultiplexer, and how is it configured?

Yes: configure E3 as the data input (active HIGH), tie E1 and E2 permanently LOW, and use A0–A2 as the 3-bit channel select. Each output Y0–Y7 becomes a gated copy of E3, asserted LOW when selected. Unused enable inputs must be hard-wired to their active states to prevent floating inputs and undefined outputs.

Does the 74AHC138PW-Q100 require external pull-up resistors on its outputs?

No - outputs are push-pull CMOS and actively drive both HIGH and LOW. Pull-ups are unnecessary and would increase static power consumption and slow LOW-to-HIGH transitions. Outputs are designed to interface directly with standard CMOS/TTL inputs without external biasing.

How does the Schmitt-trigger input action benefit automotive applications?

Schmitt-trigger inputs provide hysteresis (typically 0.4–0.6 V) on all address and enable pins, rejecting noise spikes and slow-rising signals common in automotive harnesses. This prevents false triggering during ignition transients, load dump events, or long trace runs - ensuring reliable decoding even under severe EMI conditions.