SN74LS139AN

Overview

The SN74LS139AN is a dual 2-line to 4-line decoder/demultiplexer from the Texas Instruments 74LS series. It operates on a single power supply ranging from 4.75V to 5.25V and supports an operating temperature range of 0°C to 70°C. The device features Schottky clamping for high performance and standard input regulation. It utilizes a 16-pin DIP package with a width of 0.300 inches (7.62mm). Electrical characteristics include a maximum output low current of 8mA and a load capacitance of 15pF.

Feature Summary

• Dual independent 2-to-4 decoding or demultiplexing functions within a single integrated circuit
• Schottky-clamped architecture designed to enhance switching speed and system performance
• Standard input regulation compatible with conventional logic interface requirements

Applications

• Address decoding in microprocessor-based memory systems
• Demultiplexing data streams to multiple peripheral devices
• Control signal routing in industrial automation equipment

Procurement Notes

Verify that the specific order matches the 'SN74LS139AN' designation, ensuring the 'A' suffix indicates the through-hole DIP package variant rather than surface-mount options like 'ADR'. Confirm RoHS compliance status as manufacturing processes evolve. Check datasheet revisions for any updates to mechanical dimensions or electrical limits before finalizing procurement specifications.

Selection Notes

Select this component when designing circuits requiring two separate 2-to-4 decoding channels in a single package. Ensure the design accommodates the 74LS series power consumption levels compared to modern low-power alternatives. Verify that the 16-pin DIP footprint aligns with the target PCB layout constraints and assembly methods.

Part Context

This part belongs to the widely used 74LS (Low-power Schottky) logic family, known for balanced speed and power dissipation. It serves as a fundamental building block for digital logic designs requiring address translation or data distribution. The SN74LS139AN represents the traditional through-hole implementation of this functional architecture.

Replacement Considerations

Direct pin-compatible substitutes include the SN74LS139ADRG4 and SN74LS139ANSRE4. These variants maintain identical logical functionality but differ in packaging type, such as SOIC or tape-and-reel configurations.