SN74ALS139NS

Overview

The SN74ALS139NS is a dual 2-line to 4-line decoder/demultiplexer in a 16-pin PDIP package. It operates on a 4.5 V to 5.5 V supply with an operating temperature range of 0°C to 70°C. Propagation delays are 3 ns minimum and 18 ns maximum. Low-level output current reaches 8 mA, while high-level output current is -0.4 mA. Supply current (ICC) is 13 mA maximum.

Feature Summary

• Designed for high-speed memory decoders and data transmission systems
• Incorporates two enable inputs to simplify cascading and data reception
• Features fully buffered inputs representing only one normalized load

Applications

• High-performance memory decoding
• Data routing applications
• Data transmission systems

Procurement Notes

Verify the SN74ALS139NS part number against official Texas Instruments documentation to confirm it is the catalog version characterized for 0°C to 70°C operation. Ensure the 16-pin plastic DIP (N) package matches your board layout requirements. Cross-reference the datasheet SDAS204A for accurate electrical specifications before finalizing procurement.

Selection Notes

Select this component when low propagation delay is critical for system timing. The ALS logic family provides faster switching than standard HC series devices. Verify that the 8 mA low-level output current meets the fan-out requirements of the connected loads. Confirm the 4.5 V to 5.5 V supply voltage aligns with the target circuit design.

Part Context

This device belongs to the SN54/74ALS139 family of dual 2-line to 4-line decoders. It is distinct from the SN54ALS139, which supports military temperature ranges (-55°C to 125°C). The SN74ALS139NS variant specifically utilizes the standard plastic DIP package suitable for through-hole mounting.

Replacement Considerations

SN74ALS139N is the direct equivalent in the same PDIP package.