NXP Semiconductors 74HC137N,652

Overview

74HC137N,652 from NXP Semiconductors (formerly Philips) is a high-speed CMOS 3-to-8 line decoder/demultiplexer with integrated address latches and active-LOW outputs. It operates from 2.0 V to 6.0 V, features 17 ns typical propagation delay (LE→Yn at 5 V/15 pF), supports −40 °C to +125 °C ambient range, and is used in bus-oriented systems requiring strobed address storage and non-overlapping decoding.

For engineers reviewing the 74HC137N,652 datasheet, 74HC137N,652 pinout, 74HC137N,652 application, or 74HC137N,652 equivalent, this page delivers verified functional behavior, latch timing constraints, enable logic interaction, output drive capability under load, and package-specific thermal limits - all critical for reliable integration into industrial control and legacy TTL-compatible designs.

Technical Context

The 74HC137N,652 implements a synchronous 3-bit address latch followed by an inverting 3-to-8 decoder stage. Latch enable (LE) controls data capture: when LE transitions LOW→HIGH, the last stable A0–A2 values are stored; subsequent address changes are ignored until LE returns LOW. Output enable is dual-input (E1 active-LOW, E2 active-HIGH), enabling independent control of all eight Y0–Y7 outputs regardless of latch state.

All outputs are mutually exclusive and actively driven LOW when enabled (E1=LOW, E2=HIGH); otherwise, outputs remain HIGH. The device complies with JEDEC standard no. 7A and provides ESD protection exceeding 2000 V HBM and 200 V MM, supporting robust operation in noisy industrial environments.

Key Specifications

Pinout & Package

DIP16 plastic dual in-line package (300 mil), 16-pin through-hole format with standard 0.1″ lead pitch and 0.3″ body width - compatible with legacy PCB footprints and manual soldering workflows.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC137N,652, the 74HC237N,652 offers inverted logic polarity for direct compatibility with active-HIGH systems, while SN74HC137N provides identical electrical and timing behavior with alternate manufacturing origin - both preserve pin compatibility and latch timing but differ in sourcing or output polarity.

Availability

74HC137N,652 is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, and legacy TTL-replacement projects requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC137N,652 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering logic IC development.

The 74HC137N,652 belongs to NXP's high-speed CMOS logic family, designed specifically for TTL-compatible digital systems requiring low power, wide voltage operation, and robust latch-controlled decoding in space-constrained or thermally demanding environments.

FAQ

What is the function of the LE pin on the 74HC137N,652?

The LE (Latch Enable) pin on the 74HC137N,652 is an active-LOW control that captures and holds the current A0–A2 address inputs when transitioning from LOW to HIGH. While LE remains HIGH, the latched address continues to drive the decoder outputs regardless of further changes to A0–A2. This enables strobed operation in bus systems where address and data share the same lines. The 74HC137N,652 requires precise setup and hold times relative to the LE edge to ensure reliable latching.

Can the 74HC137N,652 operate at 3.3 V supply voltage?

Yes, the 74HC137N,652 is fully specified to operate from 2.0 V to 6.0 V, including 3.3 V nominal supply. At VCC = 3.3 V, it maintains guaranteed logic thresholds (VIH ≈ 2.3 V, VIL ≈ 1.0 V), delivers ±4 mA output drive, and exhibits typical propagation delays under 25 ns. Its 3.5 pF input capacitance and low quiescent current (<160 µA at 125 °C) make the 74HC137N,652 well-suited for mixed-voltage 3.3 V/5 V system interfaces.

How do the E1 and E2 enable inputs interact on the 74HC137N,652?

On the 74HC137N,652, outputs activate only when E1 is LOW and E2 is HIGH simultaneously - all other combinations force all Y0–Y7 outputs HIGH. This dual-enable structure allows hierarchical decoding: E1 can serve as a group enable from a higher-level decoder, while E2 provides system-level gating. Neither enable affects the latch operation; they solely control output driver state. This behavior is explicitly defined in the 74HC137N,652 function table and remains consistent across temperature and voltage ranges.

Is the 74HC137N,652 pin-compatible with older TTL versions?

Yes, the 74HC137N,652 is pin-compatible with low-power Schottky TTL (74LS137) and meets JEDEC standard no. 7A, enabling direct replacement in existing designs. Its CMOS inputs draw negligible current, its outputs drive ±4 mA (exceeding LS-TTL sink capability), and its propagation delays are significantly faster than LS equivalents. No PCB changes are required when substituting the 74HC137N,652 for 74LS137, though decoupling and layout best practices for CMOS should be observed.

What is the maximum operating temperature rating for the 74HC137N,652?

The 74HC137N,652 is rated for operation from −40 °C to +125 °C ambient temperature, as confirmed in the Ordering Information table and Recommended Operating Conditions. This extended range is supported by design validation across all static and dynamic parameters, including output drive strength, propagation delay, and input threshold stability. The 74HC137N,652 maintains full functionality within this range, making it suitable for under-hood automotive, industrial motor control, and outdoor equipment applications.