SN74HCT138DRE4

Overview

The SN74HCT138DRE4 is a 3-line to 8-line decoder/demultiplexer from the SNx4HCT138 family, manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and features TTL-voltage compatible inputs with low input current (1 µA max). The device incorporates three enable inputs to simplify cascading and data reception. Designed for high-performance memory decoding and data routing, it minimizes system delay when used with fast-enable memories. It provides outputs capable of driving up to 10 LSTTL loads.

Feature Summary

• TTL-voltage compatible inputs ensure seamless integration with standard logic families.
• Three enable inputs facilitate simplified cascading and demultiplexing applications.
• Low power consumption design supports efficient operation in high-density systems.

Applications

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

Procurement Notes

Verify the package type matches the required footprint, as the SN74HCT138 series is available in multiple configurations including SOIC, PDIP, TSSOP, and others. Confirm that the specific ordering suffix corresponds to the desired reel quantity and lead finish. Ensure compatibility with the target operating temperature range of -40°C to +85°C for industrial applications before finalizing procurement.

Selection Notes

Select this component when TTL-compatible inputs are required alongside low power consumption. It is suitable for designs needing minimal propagation delay in memory systems. Consider alternative packages if different pin counts or thermal characteristics are needed. Verify that the 4.5 V to 5.5 V supply voltage aligns with the system's power rails.

Part Context

This part belongs to the SNx4HCT138 family of 3-line to 8-line decoders and demultiplexers. The 'HCT' designation indicates High-speed CMOS technology with TTL-compatible inputs. The 'E4' suffix typically denotes a lead-free and RoHS-compliant variant produced by Texas Instruments.

Replacement Considerations

SN74HCT138DRG4 is a confirmed substitute offering identical functionality and specifications within the same SOIC-16 package configuration.