SN74HCT139DR

Overview

The SN74HCT139DR is a dual 2-line to 4-line decoder/demultiplexer manufactured by Texas Instruments. It operates on a single power supply ranging from 4.5V to 5.5V and features low static power consumption with high noise immunity typical of CMOS technology. The device utilizes a 16-pin TSSOP surface-mount package, suitable for space-constrained designs. It supports an operating temperature range from -40°C to 85°C and includes active-low outputs and active-low enable inputs for flexible logic control.

Feature Summary

• Dual independent decoding channels providing four decoded outputs per channel
• Active-low outputs and active-low enable inputs for direct interface compatibility
• CMOS construction ensuring low static power dissipation and high noise margins

Applications

• Address decoding for memory and I/O port selection in embedded systems
• Demultiplexing data streams in digital communication interfaces
• Control signal generation for peripheral device activation

Procurement Notes

Verify the specific suffix 'DR' corresponds to the 16-TSSOP tape-and-reel packaging configuration. Confirm RoHS compliance status and moisture sensitivity level requirements against current project specifications. Ensure the ordering part number matches the exact manufacturer designation to avoid substitution errors during assembly.

Selection Notes

Select this component when dual independent 2-to-4 decoding is required within a single package. The HCT series ensures TTL-compatible input thresholds while maintaining CMOS output drive capabilities. Consider the TSSOP package dimensions for PCB layout constraints and verify thermal performance within the specified industrial temperature range.

Part Context

This part belongs to the SN74HCT139 family of dual decoders. It serves as a surface-mount variant of through-hole or other package options within the same logical function group. The device is designed for general-purpose digital logic applications requiring reliable address decoding or data distribution in standard 5V logic environments.

Replacement Considerations

SN74HCT139PWRE4 is a verified equivalent offering identical electrical characteristics and pinout compatibility.