SN74HC139ADBR

Overview

The SN74HC139ADBR is a dual 2-to-4 line decoder/demultiplexer from Texas Instruments' HC logic family. It features fully buffered inputs and low-power CMOS construction. The device operates within a supply voltage range of 2V to 6V and supports surface-mount installation in a 16-pin SSOP package. It includes two independent decoders with active-low outputs and enable inputs, suitable for high-speed memory decoding and data transmission systems.

Feature Summary

• Dual independent 2-to-4 line decoding capability
• Active-low outputs for direct interfacing
• Fully buffered inputs reducing driver loading

Applications

• High-speed memory address decoding
• Data transmission system routing
• General-purpose digital logic control

Procurement Notes

Verify the specific suffix 'A' indicates the SSOP package variant distinct from standard SOIC or TSSOP options. Confirm AEC-Q100 qualification status as automotive-grade variants typically carry the 'Q' prefix. Ensure ESD handling protocols are followed due to CMOS sensitivity. Cross-reference datasheet revision dates to confirm pinout consistency with existing designs.

Selection Notes

Select this component when dual independent decoding is required in a compact surface-mount form factor. The HC series offers compatibility with standard 5V logic levels while supporting lower voltage operation down to 2V. Consider the SSOP package constraints regarding thermal dissipation and board space compared to larger DIP or SOIC alternatives.

Part Context

This part belongs to the widely adopted 74HC139 logic family, providing standardized decoding functions across various manufacturers. The SN74HC139ADBR specifically denotes the Texas Instruments manufacturing source with the SSOP package configuration. It serves as a fundamental building block for complex digital systems requiring address selection or signal path management.

Replacement Considerations

SN74HC139DR (SOIC-16), SN74HC139PWR (TSSOP-16), CD74HC139M (SOIC-16). Verify package dimensions and pin spacing before substitution.