74AHCT139D-Q100J

Signal Switches, Multiplexers, Decoders Overview

The Nexperia 74AHCT139D-Q100J is a dual 2-to-4 line decoder/demultiplexer in the 74AHCT logic family. It operates on a single power supply ranging from 4.5 V to 5.5 V and supports an ambient temperature range of -40 °C to +125 °C. The device features two independent decoders, each with two binary weighted address inputs (nA0, nA1) and one active LOW enable input (nE). It provides four mutually exclusive outputs (nY0 to nY3) per decoder. The component utilizes a 16-lead SO plastic small outline package (SOT109-1) with a body width of 3.9 mm.

Signal Switches, Multiplexers, Decoders Feature Summary

• Automotive qualification compliant with AEC-Q100 Grade 1 standards for extended temperature operation.
• Inputs are overvoltage tolerant up to 5.5 V, enabling use as translators in mixed voltage environments.
• All inputs incorporate Schmitt-trigger action to ensure high noise immunity.

Signal Switches, Multiplexers, Decoders Applications

• Memory chip select decoding
• Demultiplexing data streams using the enable input as a data source
• Parallel expansion of decoder systems

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify that the specific part number suffix matches the required package variant, as the datasheet lists both SO16 and TSSOP16 options under the same base model. Confirm the automotive grade designation aligns with project requirements. Ensure the ordering information corresponds to the correct temperature range specification before finalizing procurement orders.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-compatible input levels are required within a CMOS system architecture. The AHCT series ensures compatibility with standard TTL logic voltages while maintaining low power dissipation characteristics. Verify that the 5.5 V maximum input tolerance meets the interface requirements of the driving circuitry.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the Nexperia 74AHC/AHCT139-Q100 product family, which includes variants such as the 74AHC139D-Q100J and 74AHCT139PW-Q100. These components share identical functional descriptions but differ in input voltage thresholds and package types. The family is designed for robust performance in demanding automotive electronic applications requiring reliable signal decoding.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The 74AHC139D-Q100J serves as a CMOS-level compatible alternative within the same package. Cross-referencing requires verifying that the replacement device maintains the same 16-SOIC footprint and AEC-Q100 automotive qualification status.

Signal Switches, Multiplexers, Decoders FAQ

How does the enable input function in demultiplexer mode?

In demultiplexer applications, the active LOW enable input (nE) acts as the data input. When enabled, the selected output follows the state of the enable pin, while other outputs remain HIGH.

What is the purpose of the overvoltage tolerant inputs?

The overvoltage tolerant inputs allow the device to be used as a translator between circuits operating at different voltage levels, specifically accepting input voltages up to 5.5 V even if the supply voltage is lower.