Nexperia USA Inc. 74HC137DB,118

Overview

74HC137DB,118 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), operates from 2.0 V to 6.0 V, and supports industrial temperature range (−40 °C to +125 °C). It is used in memory address decoding and I/O port expansion where input data must be latched before routing.

For engineers reviewing the 74HC137DB,118 datasheet, 74HC137DB,118 pinout, 74HC137DB,118 application, or 74HC137DB,118 equivalent, key selection considerations include latch-controlled address storage, dual enable logic for hierarchical decoding, propagation delay at 5 V (17–31 ns), output drive capability (±4 mA at 4.5 V), and SO16 package compatibility with legacy PCB footprints.

Technical Context

The 74HC137DB,118 implements a synchronous 3-bit address latch followed by an active LOW 3-to-8 decoder. Latch operation is triggered on LOW-to-HIGH transition of LE, freezing A0–A2 values independently of subsequent address changes. Output enable logic requires E1 = LOW and E2 = HIGH for any Yn to be active; all outputs remain HIGH otherwise.

Its CMOS architecture ensures low static current (≤8 μA at 6 V), high noise immunity, and latch-up immunity >100 mA per JESD78 Class II Level B. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

74HC137DB,118 is housed in a plastic small outline package (SO16), SOT109-1, with 16 leads and 3.9 mm body width. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC137DB,118, the 74HC237D,653 offers faster decode but no latching-making it unsuitable for strobed systems-while SN74HC138PWR provides identical decode logic in a smaller package but removes the critical latch enable, limiting use to purely combinatorial applications.

Availability

74HC137DB,118 is available at Aetrix Electronics and suitable for memory address decoding, I/O port expansion, interrupt vector selection, and 6-to-64 line decoder implementations requiring stable component supply across industrial and extended-temperature environments.

Supply support for 74HC137DB,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 leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with core expertise in energy-efficient and reliable standard products.

The 74HC137 belongs to Nexperia's high-speed CMOS logic family, designed specifically for robust address decoding and signal routing in industrial control, communication infrastructure, and automotive body electronics.

FAQ

What is the function of the latch enable (LE) pin on the 74HC137DB,118?

The LE pin controls data capture: a LOW-to-HIGH transition latches the current states of A0–A2, freezing them for decoding regardless of subsequent address changes. While LE remains HIGH, the device ignores new address inputs and maintains stable outputs. This enables synchronization with external address strobes in microprocessor systems.

Can the 74HC137DB,118 operate at 3.3 V supply voltage?

Yes - the 74HC137DB,118 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, providing >1.0 V noise margin. Propagation delay increases to ~25 ns (typ), and output drive is ±3.5 mA, sufficient for driving modern 3.3 V logic families.

How do the E1 and E2 enable inputs interact to control outputs?

E1 (active LOW) and E2 (active HIGH) form a logical AND gate: only when E1 = LOW and E2 = HIGH will any Yn output be enabled. If either E1 is HIGH or E2 is LOW, all outputs go HIGH (inactive). This dual-enable structure allows hierarchical control - for example, E1 can be driven by a higher-level decoder while E2 serves as a global system enable.

Is the 74HC137DB,118 pin-compatible with other 74HC137 variants like the 74HC137PW?

Yes - the 74HC137DB,118 (SO16/SOT109-1) shares identical pinout and electrical behavior with the 74HC137PW (TSSOP16/SOT403-1) and 74HC137D (SO16). All variants implement the same logic function, timing, and DC characteristics; only package dimensions and thermal performance differ. PCB layout must match SO16 land pattern for DB variant.