SN74ALS138AN

Signal Switches, Multiplexers, Decoders Overview

The SN74ALS138AN is a high-speed silicon-gate ALS logic device manufactured by Texas Instruments, housed in a 16-pin PDIP package. It functions as a 3-to-8 line decoder/demultiplexer with Schottky-clamped inputs for high performance. The component operates within a supply voltage range of 4.5 V to 5.5 V and features a propagation delay of 22 ns. It supports through-hole mounting and operates at temperatures between 0°C and +70°C, with a power dissipation rating of 200 mW.

Signal Switches, Multiplexers, Decoders Feature Summary

• Features three active-low enable inputs to control decoding operations
• Provides eight active-low outputs for demultiplexing applications
• Utilizes Schottky clamping for enhanced switching speed and noise immunity

Signal Switches, Multiplexers, Decoders Applications

• Address decoding for memory systems
• Demultiplexing data streams
• Generating chip select signals in digital circuits

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm package type and temperature grade. Ensure compatibility with existing PCB footprints for the PDIP-16 configuration. Confirm RoHS compliance status if required by project specifications before finalizing procurement orders.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a fast, low-power 3-to-8 decoder is required in a through-hole design. The ALS series offers a balance of speed and power consumption suitable for general-purpose digital logic. Verify that the system voltage remains within the specified 4.5 V to 5.5 V range to ensure reliable operation.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the Texas Instruments SN74ALS family, known for advanced low-power Schottky technology. It serves as a direct functional replacement for older standard TTL decoders while offering improved performance metrics. The device is widely used in legacy and modern digital systems requiring efficient address decoding capabilities.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The DM74ALS138N from onsemi is a documented alternative with identical logical functionality and pinout. Verify mechanical dimensions and electrical tolerances match the original design requirements before substitution.