SN74HC139PW

Overview

The SN74HC139PW is a dual 2-line to 4-line decoder/demultiplexer from the HC logic family, housed in a 16-pin TSSOP 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 fully buffered inputs and active-low outputs. Key electrical parameters include a typical propagation delay of 10 ns at 5 V, maximum input current of 1 μA, and output drive capability of ±4 mA at 5 V.

Feature Summary

• Incorporates two independent decoders with active-low enable inputs for simplified cascading or data reception
• Designed for high-speed memory decoding and data-transmission systems requiring short propagation delays
• Outputs can drive up to 10 LSTTL loads while maintaining low power consumption

Applications

• High-speed memory decoding
• Data-transmission systems
• Demultiplexing applications using the enable input as a data line

Procurement Notes

Verify the specific ordering suffix 'PW' corresponds to the TSSOP-16 package variant. Confirm RoHS compliance status and lead finish details via the manufacturer's orderable addendum. Ensure the selected part matches the required operating temperature range for the intended application environment.

Selection Notes

Select this component when a dual 2-to-4 decoder is required in a surface-mount TSSOP package. Consider the HC series characteristics regarding voltage compatibility and drive strength relative to the load requirements. Verify that the propagation delay specifications meet the timing constraints of the target system design.

Part Context

This device belongs to the SNx4HC139 family of dual decoders. Other available packages for this function include SOIC (D), SSOP (DB), PDIP (N), and SO (NS). The SN74HC139PW specifically denotes the commercial grade version in the thin-shrink small-outline package.

Replacement Considerations

SN74HC139PWR

FAQ

Can the enable input be used as a data line?

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

What is the maximum output drive current?

The outputs can drive up to 10 LSTTL loads, with a specified drive of ±4 mA at 5 V.