DM74ALS138MX

Overview

The DM74ALS138MX is a 3-to-8 line decoder/demultiplexer from the Advanced Low-power Schottky (ALS) logic family, manufactured by Fairchild Semiconductor. It operates within a supply voltage range of 4.5 V to 5.5 V and supports surface-mount installation in an SOIC-16 package. The device functions across a commercial temperature range of 0°C to +70°C.

Feature Summary

• Advanced Low-power Schottky technology for high-speed performance
• Three enable inputs to simplify cascading and data routing
• Active-low outputs for direct memory decoding applications

Applications

• High-performance memory decoding systems
• Data transmission and routing circuits
• Demultiplexing signal distribution

Procurement Notes

Verify component authenticity through authorized distributors or original manufacturer channels. Confirm RoHS compliance status and specific lot traceability before integration into production. Ensure storage conditions align with moisture sensitivity level requirements to maintain reliability during assembly processes.

Selection Notes

Select this component when system design requires low propagation delay combined with reduced power consumption compared to standard TTL families. The ALS series offers improved switching characteristics suitable for complex digital logic architectures requiring efficient bus management and address decoding capabilities.

Part Context

This part belongs to the Fairchild DM74ALS series, representing the industry-standard implementation of Advanced Low-power Schottky logic. It provides backward compatibility with existing 74-series designs while delivering superior speed-to-power ratios essential for modern embedded control and communication hardware.

Replacement Considerations

Cross-reference with SN74ALS138AN or other equivalent 3-to-8 decoders from Texas Instruments or onsemi. Verify pinout compatibility and electrical parameter alignment before substituting in existing circuit layouts.