Nexperia USA Inc. 74HC137PWJ

Overview

74HC137PWJ from Nexperia is a 3-to-8 line decoder/demultiplexer with integrated address latches and active-LOW mutually exclusive outputs. It decodes three binary inputs (A0–A2) into eight outputs (Y0–Y7), features latch enable (LE), dual output enables (E1 active LOW, E2 active HIGH), and operates across 2.0 V to 6.0 V supply. Used in memory address decoding and I/O port expansion where input state retention is required.

For engineers reviewing the 74HC137PWJ datasheet, 74HC137PWJ pinout, 74HC137PWJ application, or 74HC137PWJ equivalent, key selection criteria include latch-controlled address storage, dual enable logic for hierarchical decoding, propagation delay under 36 ns at 4.5 V, and TSSOP16 packaging for high-density PCB layouts.

Technical Context

The 74HC137 implements a synchronous 3-bit address latch followed by an inverting 3-to-8 decoder stage. Latch operation is edge-triggered on LE's LOW-to-HIGH transition, freezing A0–A2 values independently of subsequent address changes. Output enable logic requires E1 = LOW and E2 = HIGH for any Yn to drive LOW; all outputs remain HIGH otherwise.

Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The device complies with JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), supports operation from –40 °C to +125 °C, and exhibits latch-up immunity >100 mA per JESD78 Class II Level B.

Key Specifications

Pinout & Package

TSSOP16 package (SOT403-1): 4.4 mm body width, 0.65 mm lead pitch, surface-mount, RoHS-compliant plastic housing with exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC137PWJ, the 74HC237PW removes latch capability and inverts output polarity, simplifying design at the cost of synchronous address hold; the SN74LV138APW trades latch and voltage flexibility for lower static power and LV logic compatibility, shifting timing responsibility to the system controller.

Availability

74HC137PWJ is available at Aetrix Electronics and suitable for memory address decoding, I/O port expansion, industrial bus arbitration, and legacy peripheral interface applications requiring stable component supply and long-term industrial temperature support.

Supply support for 74HC137PWJ 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 logic, analog, and MOSFET solutions with emphasis on reliability, efficiency, and sustainability.

The 74HC logic family targets general-purpose digital interfacing and control functions in industrial, consumer, and computing applications, prioritizing wide supply range, noise immunity, and pin-for-pin compatibility across voltage grades.

FAQ

What is the function of the LE pin on the 74HC137PWJ?

The LE (Latch Enable) pin controls address sampling: a LOW level enables transparent decoding of A0–A2, while a LOW-to-HIGH transition captures and holds the current address bits in internal latches. Once latched, further changes to A0–A2 are ignored until LE returns LOW, ensuring stable output selection during bus contention or asynchronous address updates.

Can the 74HC137PWJ operate at 3.3 V supply?

Yes - the 74HC137PWJ is fully specified from 2.0 V to 6.0 V, including 3.3 V operation. At VCC = 3.3 V, VIH is guaranteed ≥2.31 V and VIL ≤1.32 V per JESD8C, providing >1 V noise margin. Propagation delay increases to ~45 ns (max) at 3.3 V/50 pF, remaining compatible with most 3.3 V microcontrollers and FPGAs.

How do E1 and E2 interact to control outputs?

E1 and E2 form a two-input AND gate controlling output enable: only when E1 is LOW and E2 is HIGH will any Yn output drive LOW (active state). If either E1 is HIGH or E2 is LOW, all outputs remain HIGH (inactive). This dual-enable structure allows hierarchical decoding - e.g., E1 driven by a higher-level decoder, E2 by system mode control.

Is the 74HC137PWJ pin-compatible with the SO16 version (74HC137D)?

Yes - both 74HC137PWJ (TSSOP16, SOT403-1) and 74HC137D (SO16, SOT109-1) share identical pin numbering, signal assignment, and electrical specifications. Mechanical differences (package thickness, lead pitch, thermal resistance) require separate PCB footprints, but logic design, timing analysis, and schematic symbols are fully interchangeable.