SN74HCT139D

Overview

The SN74HCT139D is a dual 2-line to 4-line decoder/demultiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and features TTL-compatible inputs with CMOS outputs. The device is housed in a 16-SOIC package and supports surface-mount installation. It functions across an operating temperature range of -40°C to 85°C, providing reliable decoding for digital logic applications.

Feature Summary

• Dual independent 2-to-4 line decoding capability
• TTL-compatible input thresholds for HCT logic integration
• CMOS output structure ensuring low power consumption

Applications

• Address decoding in microprocessor systems
• Data distribution in demultiplexing circuits
• Control signal routing in industrial automation

Procurement Notes

Verify the specific manufacturer part number against official Texas Instruments documentation to confirm pinout compatibility and electrical specifications. Ensure the procurement source provides valid RoHS compliance data and confirms the SOIC-16 package variant matches design requirements before finalizing acquisition.

Selection Notes

Select this component when dual independent decoding channels are required within a single package. The HCT series ensures compatibility with standard TTL logic levels while maintaining CMOS output characteristics. Verify that the 16-SOIC package dimensions fit the target PCB layout constraints.

Part Context

This component belongs to the SN74HCT139 family of logic integrated circuits. It serves as a specialized decoder/demultiplexer unit designed for high-speed digital switching applications. The device integrates two separate decoding sections to optimize board space and simplify circuit design for address selection tasks.

Replacement Considerations

SN74HCT139PWR: Texas Instruments equivalent in TSSOP-16 package. CD74HCT139M: Texas Instruments equivalent in SOIC-14 package.