SN74HC139ADB

Overview

The SN74HC139ADB is a dual 2-line to 4-line decoder and demultiplexer manufactured by Texas Instruments. It belongs to the HC logic family and operates within a supply voltage range of 2 V to 6 V. The device features fully buffered inputs, each representing one normalized load for its driving circuit. Outputs are active-low, making them suitable for memory decoding and data transmission systems. It supports operation across an extended temperature range from -40°C to +85°C.

Feature Summary

• Dual independent 2-to-4 line decoding and demultiplexing circuits
• Active-low outputs compatible with LSTTL loads
• Fully buffered inputs for improved noise immunity
• Wide operating voltage range supporting various logic levels

Applications

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

Procurement Notes

Verify the specific suffix 'ADB' against the manufacturer's official datasheet to confirm package type and tape/reel specifications. Ensure the component meets RoHS compliance requirements for your target market. Cross-reference the ordering information with authorized distributors to confirm availability and authenticity before procurement.

Selection Notes

Select this component when dual independent decoding or demultiplexing is required in space-constrained designs. The HC series offers low power consumption and high noise immunity compared to older logic families. Consider the SSOP-16 package for surface-mount applications requiring compact footprints while maintaining standard logic compatibility.

Part Context

This part is part of the widely used 74HCxx series of CMOS logic devices. It provides a cost-effective solution for basic digital logic functions in consumer electronics and industrial equipment. The SN74HC139ADB variant specifically utilizes the SSOP-16 package, offering a smaller footprint than traditional DIP packages while maintaining pin compatibility.

Replacement Considerations

Compatible substitutes include SN74HC139DR (SOIC-16) and SN74HC139PWR (TSSOP-16). Verify that replacement parts maintain the same logic family characteristics and package dimensions for direct board-level integration without redesign.