SN74AHCT139NSRE4

Signal Switches, Multiplexers, Decoders Overview

The SN74AHCT139NSRE4 is a dual 2-line to 4-line decoder and demultiplexer manufactured by Texas Instruments. It belongs to the AHCT logic family, designed for high-speed memory decoding and data transmission systems. The device operates within a supply voltage range of 4.5 V to 5.5 V and features fully buffered inputs that represent only one normalized load for the driving circuit. It includes two independent enable inputs (G) which are active-low and can be used as data inputs in demultiplexer applications. The component is housed in a 16-pin Small Outline Package (SOIC) with a standard lead pitch.

Signal Switches, Multiplexers, Decoders Feature Summary

• Dual 2-to-4 line decoding and demultiplexing functionality integrated into a single package
• AHCT technology ensures compatibility with standard CMOS outputs while accepting TTL-level inputs
• Active-low enable inputs allow flexible configuration for cascading or data routing
• Fully buffered inputs provide robust signal integrity and simplified driving requirements

Signal Switches, Multiplexers, Decoders Applications

• High-speed memory address decoding
• Data transmission system routing
• Demultiplexing control signals
• Cascaded logic expansion circuits

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix 'SR' indicates tape and reel packaging when sourcing. Confirm the 'E4' suffix denotes lead-free composition and RoHS compliance. Ensure the SOIC-16 package matches the target PCB footprint. Cross-reference the datasheet revision date to confirm current electrical characteristics and ordering information.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL input compatibility is required alongside CMOS output drive capabilities. The AHCT series is suitable for systems operating strictly at 5V. Consider the propagation delay specifications relative to system clock speeds. Verify thermal dissipation requirements for the SOIC package under maximum load conditions.

Signal Switches, Multiplexers, Decoders Part Context

This part is part of the SN74AHCT139 family of decoders and demultiplexers. It shares functional similarities with other 74-series logic devices but offers improved speed and power efficiency compared to older HC or HCT variants. The device is widely used in digital logic designs requiring reliable address decoding or signal distribution.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct substitutes include SN74AHCT139N and SN74AHCT139PW. For automotive applications, consider the SN74AHC139QPWRQ1. Verify pinout compatibility and voltage levels before substituting with non-AHCT family members.