SN74AHC139D

Signal Switches, Multiplexers, Decoders Overview

The SN74AHC139D is a dual 2-line to 4-line demultiplexer from the Texas Instruments AHC logic family. It features two independent decoders with active-low outputs and enable inputs, housed in a 16-pin SOIC package. The device operates within a supply voltage range of 2 V to 5.5 V and supports a wide operating temperature range from -40°C to +85°C. Propagation delay is typically 8.5 ns at 5 V. This component is designed for high-speed digital applications requiring efficient address decoding or data distribution.

Signal Switches, Multiplexers, Decoders Feature Summary

• Dual independent decoder/demultiplexer architecture
• Active-low output states for precise signal control
• Wide supply voltage compatibility for flexible system integration

Signal Switches, Multiplexers, Decoders Applications

• Address decoding in embedded systems
• Data distribution networks
• Peripheral chip select generation

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the exact suffix against official datasheets to confirm package type and temperature grade. Ensure the ordering part number matches the required SOIC-16 configuration. Cross-reference specifications with the manufacturer's latest documentation to confirm compliance with current RoHS standards and material declarations before finalizing procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when dual independent decoding is required within a single package. The AHC series offers faster switching speeds compared to standard HC logic while maintaining CMOS power efficiency. Verify that the 2V to 5.5V input/output voltage levels align with the target system's logic thresholds and power supply rails.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the SN74AHC139 series, which provides dual 2-to-4 line decoding capabilities. It is part of Texas Instruments' broader AHC logic portfolio, designed to replace older HC/HCT devices with improved performance characteristics. The D suffix indicates a standard plastic small-outline package suitable for surface-mount assembly.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74AHC139DR (Reel packaging variant)

Signal Switches, Multiplexers, Decoders FAQ

What is the function of the enable inputs?

The enable inputs allow the user to disable the respective decoder outputs, forcing all outputs to a high state regardless of the address inputs.

Are the outputs active-high or active-low?

The SN74AHC139D features active-low outputs, meaning the selected output goes low while unselected outputs remain high.