SN74LS139AD

Overview

The SN74LS139AD 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 is housed in a 16-SOIC package with a width of 3.90mm. Electrical characteristics include a maximum output low current of 8mA and a load capacitance of 15pF.

Feature Summary

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

Applications

• Address decoding for memory arrays
• Demultiplexing data streams to multiple destinations
• Control signal distribution in digital systems

Procurement Notes

Verify the specific suffix against official documentation, as ordering codes may indicate variations in packaging or environmental compliance without altering the core function. Confirm RoHS status and moisture sensitivity level prior to integration. Ensure the selected variant matches the required lead-free specifications and package dimensions for your PCB layout.

Selection Notes

Select this component when dual independent 2-to-4 decoding is required within the 74LS logic family constraints. Consider the 16-SOIC package for surface-mount assembly needs. Evaluate the 4.75V to 5.25V supply requirement and 0°C to 70°C temperature range against system specifications before finalizing the design choice.

Part Context

This part belongs to the SN54/74(LS,S)139/A series, which encompasses various decoders and demultiplexers. The LS designation indicates Low-power Schottky technology, balancing power consumption with speed. The device provides two separate decoder circuits, allowing for flexible configuration in complex digital logic applications requiring address selection or data routing.

Replacement Considerations

SN74LS139ADR

FAQ

What is the primary function of the SN74LS139AD?

It serves as a dual 2-line to 4-line decoder or demultiplexer.

Does the device support active-low outputs?

Yes, the datasheet describes it as a decoder/demultiplexer typically featuring active-low outputs common to this logic family.