SN74HCS138DR

Overview

The SN74HCS138DR is a high-speed CMOS logic device manufactured by Texas Instruments, functioning as a 3-line to 8-line decoder or demultiplexer. It operates within a supply voltage range of 2 V to 6 V and supports surface-mount installation in a 16-pin SOIC package. The component features a propagation delay of 22 ns and maintains functionality across an extended industrial temperature range from -40°C to +125°C.

Feature Summary

• Provides decoding or demultiplexing functions for three binary inputs into eight distinct outputs
• Utilizes high-speed CMOS technology to ensure low power consumption alongside rapid signal processing
• Supports wide operating voltage ranges suitable for diverse digital logic environments

Applications

• Address decoding in microprocessor-based systems
• Data routing in communication interfaces
• Memory chip selection circuits

Procurement Notes

Verify the specific suffix 'DR' corresponds to the SOIC-16 package and tape-and-reel packaging configuration. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure thermal management aligns with the specified -40°C to +125°C operational limits during system design.

Selection Notes

Select this component when a single 3-to-8 decoder is required within space-constrained designs utilizing SOIC packages. Consider the HCS series benefits for applications demanding lower power dissipation compared to standard TTL equivalents while maintaining compatibility with 2V to 6V logic levels.

Part Context

This part belongs to the SN74HCS family of high-speed CMOS logic devices from Texas Instruments. The HCS series is designed to offer performance improvements over legacy HC/HCT families, including reduced power consumption and enhanced noise immunity, making it suitable for modern embedded and industrial control applications.

Replacement Considerations

Direct pin-compatible alternatives within the same family include SN74HCS138D and SN74HCS138PW. Verify package dimensions and electrical characteristics against the original design requirements before substitution.