SN74LS139ADR

Overview

The SN74LS139ADR 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 a maximum static current of 8mA with a low-level output current of 400µA. The device features Schottky clamping for high performance and is housed in a 16-SOIC package with a width of 3.90mm. It functions within an operating temperature range of 0°C to 70°C and complies with RoHS3 standards.

Feature Summary

• Dual independent 2-to-4 decoding or demultiplexing circuits
• Schottky clamped structure for enhanced switching speed
• Standard input regulation compatible with TTL logic levels

Applications

• Address decoding for memory arrays
• Demultiplexing data streams in digital systems
• Control signal distribution in industrial automation

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to confirm package type, lead-free status, and environmental compliance. Ensure the component matches the required 16-SOIC footprint and voltage specifications for your circuit design before procurement.

Selection Notes

Select this component when dual independent decoding or demultiplexing is required within standard TTL logic families. Consider the 74LS series characteristics regarding power consumption and speed relative to other logic families like HC or ALS for optimal system integration.

Part Context

This part belongs to the Texas Instruments 74LS logic family, known for Schottky technology that prevents saturation to improve switching speeds. The SN74LS139 specifically provides two separate decoders in one package, offering space efficiency compared to using individual single-decoder ICs.

Replacement Considerations

SN74LS139ADRG4 and SN74LS139ADRE4 are confirmed equivalent variants from Texas Instruments.