SN74ALS139NSR

Overview

The SN74ALS139NSR is a dual 2-line to 4-line decoder/demultiplexer from Texas Instruments' ALS logic series. It operates within a supply voltage range of 4.5 V to 5.5 V and features three active-low enable inputs for precise control. The device utilizes SOIC-14 surface-mount packaging and supports operation temperatures from 0°C to +70°C. Key electrical characteristics include a propagation delay of 22 ns, low-level output current of 8 mA, and high-level output current of -400 uA.

Feature Summary

• Dual independent decoding channels providing four outputs per channel
• Three active-low enable inputs for flexible chip selection and data routing
• Inverted output polarity suitable for memory addressing applications

Applications

• High-performance memory decoding systems
• Data demultiplexing circuits
• Address decoding in industrial control environments

Procurement Notes

Verify the specific suffix 'NSR' confirms the SOIC-14 package and tape-and-reel shipping format. Confirm RoHS compliance status through official manufacturer documentation or certified datasheets prior to integration. Ensure the ordering part number matches the exact functional requirements and pinout configuration specified in the official SN74ALS139 datasheet.

Selection Notes

Select this component when dual independent decoding with inverted outputs is required. The ALS series offers improved speed over standard TTL while maintaining compatible power consumption levels. Verify that the 22 ns propagation delay meets system timing constraints and that the SOIC-14 footprint aligns with the PCB layout design.

Part Context

This device belongs to the SN74ALS139 family of decoders. It serves as a semiconductor solution for converting binary codes into active signals. The ALS technology provides a balance between switching speed and power efficiency, making it suitable for general-purpose digital logic applications requiring reliable signal routing.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.