SN74HCT138NE4

Overview

The SN74HCT138NE4 is a 3-line to 8-line decoder/demultiplexer from the Texas Instruments HCT logic family. It operates within a supply voltage range of 4.5 V to 5.5 V and features TTL-compatible inputs with low input current. The device incorporates three enable inputs to simplify cascading and data reception. It provides active-low outputs capable of driving up to 10 LSTTL loads, with typical propagation delays of 17 ns at 5 V. The component is housed in a 16-pin PDIP package.

Feature Summary

• Designed for high-performance memory decoding and data routing applications requiring short propagation delay times
• Incorporates two active-low and one active-high enable inputs to facilitate expansion without external inverters
• Features TTL-voltage compatible inputs with low power consumption characteristics

Applications

• High-speed memory systems
• Data transmission systems
• System decoding circuits

Procurement Notes

Verify that the ordering suffix 'E4' corresponds to the specific lead finish and RoHS compliance status required by your manufacturing process. Confirm the package type matches the intended PCB footprint. Ensure all unused inputs are tied to defined logic levels to prevent undefined operational states during operation.

Selection Notes

Select this component when TTL-compatible logic interfaces are required alongside CMOS performance benefits. The HCT series ensures compatibility with standard TTL voltage levels while offering lower power consumption. Verify that the operating temperature range meets the environmental requirements of the target application.

Part Context

This part belongs to the SNx4HCT138 family of 3-line to 8-line decoders and demultiplexers manufactured by Texas Instruments. The family includes variants such as SN74HCT138N and SN74HCT138DR, differing primarily in packaging options like PDIP or SOIC. The device is designed to minimize system decoding effects in high-performance environments.

Replacement Considerations

SN74HCT138N