SN74LS138DRE4

Overview

The SN74LS138DRE4 is a 3-line to 8-line decoder/demultiplexer from the Texas Instruments SN74LS series. It operates within a supply voltage range of 4.75 V to 5.25 V and features a propagation delay of 41 ns. The device supports an operating temperature range from 0 °C to +70 °C and utilizes a SOIC-Narrow-16 surface-mount package.

Feature Summary

• Provides decoding or demultiplexing functions with three address inputs and eight active-low outputs.
• Includes three enable inputs for flexible system control and chip selection.
• Designed for standard 5-V logic applications using Low-power Schottky technology.

Applications

• Address decoding in microprocessor-based systems
• Data distribution in digital communication circuits
• Control signal generation for peripheral devices

Procurement Notes

Verify that the ordering suffix 'E4' confirms lead-free status and RoHS compliance as per manufacturer specifications. Confirm the SOIC-16 package dimensions match the target PCB footprint. Ensure the 0 °C to +70 °C commercial temperature rating meets the operational environment requirements before finalizing procurement.

Selection Notes

Select this component when a 5-V logic interface is required for address decoding or data routing. The SN74LS138DRE4 offers a balance of speed and power consumption suitable for general-purpose digital designs. Consider the SOIC-16 package for surface-mount assembly constraints and verify compatibility with existing 5-V logic families in the circuit architecture.

Part Context

This part belongs to the SN74LS family, representing Low-power Schottky TTL logic. The SN74LS138 variant specifically provides 3-to-8 line decoding capabilities. The 'DRE4' suffix indicates a tape-and-reel packaging format with specific manufacturing attributes defined by Texas Instruments for this particular product line iteration.

Replacement Considerations

The SN74LS138DR serves as a direct functional equivalent without the E4 suffix. Other compatible variants include the SN74LS138D in tube packaging. Verify pinout and electrical characteristics remain identical when substituting these parts.