SN74ALS138ADE4

Signal Switches, Multiplexers, Decoders Overview

The SN74ALS138ADE4 is a single 3-line to 8-line decoder/demultiplexer from the Texas Instruments ALS logic family. It operates within a supply voltage range of 4.5 V to 5.5 V and features a propagation delay of 22 ns. The device utilizes a 16-pin SOIC narrow surface-mount package and supports an operating temperature range from 0°C to +70°C. It includes two active-low and one active-high enable inputs for flexible control.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides decoding or demultiplexing functions with three address inputs and eight outputs
• Incorporates Schottky-clamped architecture for high-speed performance
• Features mixed polarity enable inputs (two active-low, one active-high) for system integration

Signal Switches, Multiplexers, Decoders Applications

• High-speed memory address decoding
• Data routing in digital systems
• Demultiplexing signal distribution

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix 'E4' against the manufacturer's current documentation to confirm compliance status and any recent product change notifications. Ensure the SOIC-16 footprint matches the target PCB design. Confirm that the ALS series availability aligns with long-term supply requirements.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when Schottky-clamped speed is required alongside standard TTL voltage levels. The ALS series offers faster switching than LS variants while maintaining compatible power consumption profiles suitable for dense logic designs requiring precise timing control.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN74ALS138A family of decoders. It shares functional compatibility with other 3-to-8 line decoders but distinguishes itself through the Advanced Low-power Schottky technology, which provides improved speed over standard LS logic without significantly increasing power dissipation.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74ALS138AN (PDIP variant)

Signal Switches, Multiplexers, Decoders FAQ

What is the logic family type?

Advanced Low-power Schottky (ALS)

How many enable inputs are present?

Three: two active-low and one active-high