SN74S138AN3

Signal Switches, Multiplexers, Decoders Overview

The SN74S138AN3 is a high-speed Schottky TTL 3-line to 8-line decoder/demultiplexer manufactured by Texas Instruments. It features three binary address inputs and eight active-low outputs, along with three enable inputs for cascading or system control. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports through-hole mounting in a 16-pin PDIP package. It provides a propagation delay of 22 ns and handles a power dissipation of 200 mW.

Signal Switches, Multiplexers, Decoders Feature Summary

• High-speed Schottky TTL technology ensures rapid switching performance.
• Three enable inputs allow flexible cascading and system-level control.
• Active-low outputs provide direct interfacing with standard logic loads.

Signal Switches, Multiplexers, Decoders Applications

• Address decoding in microprocessor-based systems
• Demultiplexing data streams in digital communication circuits
• Memory chip select generation in storage architectures

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix 'AN3' against the manufacturer's current product status, as it may indicate an obsolete or discontinued variant compared to standard 'AN' versions. Confirm RoHS compliance details directly from the official datasheet, as historical S-series parts often differ from modern environmental standards. Ensure the 16-pin PDIP package matches your PCB footprint requirements before finalizing procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when high-speed decoding is required using Schottky TTL logic levels. It is suitable for designs needing precise timing with a 22 ns propagation delay. Consider the three enable inputs for complex system integration where multiple decoders must be managed simultaneously. Verify that the operating temperature range of 0°C to +70°C meets your environmental constraints.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN74S series of high-speed Schottky TTL logic devices. It functions as a 3-to-8 line decoder, converting binary codes into one-of-eight active signals. The SN74S138 family is widely recognized for its speed advantages over standard TTL counterparts, making it suitable for applications requiring faster response times than LS or ALS series devices.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The SN74ALS138AN is a compatible alternative offering similar functionality with lower power consumption. For pin-compatible replacements, verify the SN74LS138AN for slower but more cost-effective solutions. Always check the manufacturer's obsolescence notices for the SN74S138AN3 series before substituting.