SN74LS139DR2

Overview

The SN74LS139DR2 is a dual 1-of-4 decoder/demultiplexer manufactured by Motorola. It belongs to the LS (Low-power Schottky) logic series, utilizing Schottky clamped technology for high performance. The device integrates two independent decoders within a single package. Each decoder accepts two binary inputs and provides four active-low outputs. It is designed for standard input regulation and operates within a commercial temperature range of 0 to 70 degrees Celsius. The component is housed in a 16-pin Small Outline Integrated Circuit (SOIC) package.

Feature Summary

• Integrates two independent 1-of-4 decoder circuits
• Utilizes Low-power Schottky (LS) technology for high-speed operation
• Features active-low output states for each decoder channel

Applications

• Address decoding for memory systems
• Demultiplexing data streams
• Control signal routing in digital logic circuits

Procurement Notes

Verify the manufacturer designation as Motorola or its successor entities, as production rights may have transferred. Confirm the specific suffix 'DR2' corresponds to the SOIC-16 package and reel packaging format. Ensure the component meets the required LS logic family specifications and commercial temperature ratings for your application environment.

Selection Notes

Select this component when dual independent decoding or demultiplexing functions are required in a compact form factor. The LS series offers a balance of speed and power consumption suitable for general-purpose digital applications. Consider the 16-pin SOIC footprint for PCB layout compatibility and ensure voltage levels match the system's logic standards.

Part Context

This part is part of the broader 74LS139 family of dual decoders. Similar variants exist from other manufacturers such as Texas Instruments (e.g., SN74LS139ADR). The 'DR2' suffix typically indicates tape-and-reel packaging for surface-mount assembly. It serves as a fundamental building block for address decoding and data distribution in legacy and modern digital designs.

Replacement Considerations

Compatible substitutes include SN74LS139ADR from Texas Instruments. Verify pinout compatibility and electrical characteristics before substitution. Ensure the replacement part supports the same LS logic family requirements and package dimensions.