SN74HC139AN

Overview

The SN74HC139AN 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 2V to 6V. The device features fully buffered inputs, each representing only one normalized load for its driving circuit. Low-active enable (G) inputs can function as data lines in demultiplexing applications. Designed for high-speed memory decoding and data transmission systems, it offers low power consumption with a maximum ICC of 80µA and typical propagation delays of 10ns at 5V.

Feature Summary

• Dual independent 2-to-4 line decoding and demultiplexing circuits
• Low-active enable inputs compatible with data line operations
• Fully buffered inputs for standardized driving loads
• Optimized for high-speed memory addressing and data routing

Applications

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

Procurement Notes

Verify the specific suffix 'AN' against the manufacturer's current datasheet to confirm package type and temperature grade. Ensure the ordering code matches the required PDIP configuration and industrial specifications. Cross-reference part numbers with official TI documentation to avoid confusion with automotive or TSSOP variants.

Selection Notes

Select this component when dual 2-to-4 decoding is required in CMOS logic designs. It is suitable for applications needing wide voltage operation between 2V and 6V. Consider the PDIP package for through-hole mounting requirements. Verify input buffering needs and power consumption constraints against the HC series specifications.

Part Context

This part is a member of the Texas Instruments SN74HC series, which provides high-speed CMOS logic performance. It serves as a standard solution for decoding and demultiplexing tasks in digital electronics. The device complements other 74HC logic families by offering dedicated multi-function decoding capabilities in a compact 16-pin format.

Replacement Considerations

Compatible substitutes include SN74HC139N and SN74HC139PW. Verify pinout compatibility and electrical characteristics before substitution. Automotive-grade alternatives such as SN74HC139QPWRQ1 offer extended temperature ranges but require validation of package and qualification standards.