SN74HC138ANS

Overview

The SN74HC138ANS is a single 3-to-8 line decoder/demultiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and features three binary selection inputs that determine which of the eight low-active outputs is selected. The device utilizes an SOIC-16 surface-mount package and supports a wide operating temperature range from -40°C to +85°C. Designed for high-performance memory decoding and data routing, it offers propagation delays typical of the HC logic family while maintaining low power consumption characteristics associated with CMOS technology.

Feature Summary

• Features three enable inputs (two active-low and one active-high) to simplify cascading and reduce external logic requirements.
• Outputs are capable of driving up to ten Low-power Schottky TTL loads without additional buffering.
• Designed specifically for high-speed memory decoding applications where minimal system delay is critical.

Applications

• High-performance memory address decoding systems
• Data routing and demultiplexing circuits
• Industrial control logic interfaces

Procurement Notes

Verify the specific suffix 'ANS' against the official Texas Instruments datasheet to confirm pinout compatibility and package dimensions. Ensure the component meets RoHS standards if required by your manufacturing process. Check current availability status as this part number may be subject to lifecycle changes or regional distribution restrictions.

Selection Notes

Select this component when a standard 3-to-8 decoder is needed with low power consumption and moderate speed. It is suitable for designs requiring multiple enable inputs for complex system expansion. Consider the SOIC-16 package constraints for PCB layout. Verify that the 2V to 6V supply range aligns with the target system voltage levels.

Part Context

This component belongs to the SN74HC138 series of decoders and demultiplexers. It is part of the broader 74HC logic family, known for combining CMOS low power with speeds comparable to Low-power Schottky TTL. The SN74HC138ANS variant specifically denotes the SOIC-16 surface mount package configuration.

Replacement Considerations

Compatible alternatives include SN74HC138DR, SN74HC138DT, and CD74HC138. Verify pin compatibility and electrical specifications before substitution.