SN74AHCT138DR

Signal Switches, Multiplexers, Decoders Overview

The SN74AHCT138DR is a 3-line to 8-line decoder/demultiplexer from the Texas Instruments SN74AHCT138 family. It operates on a single supply voltage ranging from 1.5 V to 5.5 V, with a recommended operating range of 4.5 V to 5.5 V for optimal performance. The device features TTL-voltage compatible inputs and provides outputs capable of sourcing and sinking up to 8 mA. Designed for high-speed memory decoding and data routing, it incorporates three enable inputs to simplify cascading. The component is housed in a 16-pin SOIC package and supports an industrial operating temperature range from -40°C to +85°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• TTL-voltage compatible inputs ensure seamless integration with standard logic families.
• Three enable inputs facilitate simplified system expansion and cascading without external inverters.
• High-speed design minimizes propagation delay, making it suitable for fast memory systems.

Signal Switches, Multiplexers, Decoders Applications

• High-performance memory decoding
• Data-routing applications
• Data-transmission systems

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify that the specific orderable part number matches the required package type and moisture sensitivity level. Confirm the operating temperature range aligns with the intended application environment. Ensure compliance with RoHS directives if required by the manufacturing process. Check for any recent documentation updates or revision history changes that may affect pinout or electrical characteristics before finalizing procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-compatible inputs are required alongside high-speed decoding capabilities. The SN74AHCT138DR is appropriate for designs needing multiple enable lines to manage complex address decoding or demultiplexing tasks. Consider the 16-pin SOIC package constraints regarding board space and thermal dissipation. Verify that the load capacitance requirements fall within the specified switching characteristic limits for the target clock speeds.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the SNx4AHCT138 series of 3-line to 8-line decoders and demultiplexers manufactured by Texas Instruments. The 'SN74' prefix indicates commercial grade availability, while 'AHCT' denotes advanced high-speed CMOS technology with TTL compatibility. The 'DR' suffix specifically identifies the SOIC (Small Outline Integrated Circuit) package variant with tape and reel packaging for automated assembly processes.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct replacements include other variants within the SN74AHCT138 family such as SN74AHCT138PWR (TSSOP) or SN74AHCT138DBR (SSOP), provided the package footprint is adaptable. Non-TI equivalents must be verified for identical pinouts, voltage ranges, and electrical characteristics to ensure functional compatibility.