SN74HC139DR

Overview

The SN74HC139DR 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 with a typical propagation delay of 10 ns at 5 V. Outputs can drive up to 10 LSTTL loads, providing ±4 mA drive current at 5 V. Power consumption is low, with a maximum ICC of 80 μA.

Feature Summary

• Designed for high-speed memory decoding and data-transmission systems requiring short propagation delays
• Incorporates two enable inputs to simplify cascading and demultiplexing applications
• Features fully buffered inputs that represent only one normalized load to the driving circuit

Applications

• High-performance memory system decoding
• Data routing and transmission systems
• Demultiplexing applications using active-low enable inputs as data lines

Procurement Notes

Verify the specific ordering suffix 'DR' corresponds to the SOIC-16 tape-and-reel packaging configuration. Confirm RoHS compliance status and lead finish details via the manufacturer's official orderable addendum or datasheet documentation before finalizing procurement specifications.

Selection Notes

Select this component when a dual 2-to-4 decoder is required in surface-mount technology. Ensure the design accommodates the 2 V to 6 V supply range and -40°C to +85°C temperature limits. Verify input handling requirements against the specified VIH and VIL thresholds for the target operating voltage.

Part Context

This part belongs to the SNx4HC139 series, which includes variants such as SN74HC139N (PDIP) and SN74HC139DB (SSOP). All variants share identical logical functionality but differ in physical package dimensions and mounting styles. The SN74HC139D variant is listed as obsolete, while the SN74HC139DR remains in active production.

Replacement Considerations

SN74HC139DT (Obsolete)

FAQ

Can the enable input be used for demultiplexing?

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

What is the output drive capability?

The outputs can drive up to 10 LSTTL loads, providing ±4 mA output drive current at 5 V.