SN74HC139DT

Overview

The SN74HC139DT is a dual 2-line to 4-line decoder/demultiplexer in the HC logic family, housed in a 16-pin SOIC package. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range of -40°C to 85°C. The device features active-low outputs and incorporates two enable inputs to simplify cascading or data reception applications.

Feature Summary

• Designed for high-speed memory decoders and data-transmission systems
• Incorporates fully buffered inputs representing only one normalized load
• Active-low enable input functions as a data line in demultiplexing

Applications

• High-performance memory decoding
• Data-routing applications
• Demultiplexing circuits

Procurement Notes

Verify current production status as the SN74HC139DT is listed as obsolete in official documentation. Confirm availability of alternative packages such as SN74HC139DR or SN74HC139DBR for new designs. Ensure compliance with RoHS standards if required by the application environment.

Selection Notes

Select this component for applications requiring low power consumption and fast propagation delays. Verify that the driving circuit can handle the normalized load requirements. Consider thermal resistance characteristics when designing PCB layouts for dense configurations.

Part Context

Part of the SNx4HC139 series featuring two independent decoders per package. The HC logic family provides wide voltage operation and CMOS compatibility. This specific part number denotes the SOIC surface-mount variant within the broader decoder product line.

Replacement Considerations

SN74HC139DR (SOIC), SN74HC139DBR (SSOP)

FAQ

Can the enable input be used for data reception?

Yes, the active-low enable input can function as a data line in demultiplexing applications.

What is the maximum output drive capability?

Outputs can drive up to 10 LSTTL loads.