MC74VHCT139ADR2

Signal Switches, Multiplexers, Decoders Overview

The MC74VHCT139ADR2 is a dual 2-to-4 decoder/demultiplexer from the VHCT logic family, fabricated using silicon gate CMOS technology. It operates within a supply voltage range of 2V to 5.5V and features TTL-compatible inputs with VIL = 0.8V and VIH = 2.0V. The device provides balanced propagation delays, typically 5.0ns at 5V, and low quiescent current of 4μA max. Outputs are active-low and compatible with full 5V CMOS levels. It includes power-down protection on inputs and outputs, ensuring high noise immunity and stable operation.

Signal Switches, Multiplexers, Decoders Feature Summary

• Advanced high-speed CMOS technology providing performance similar to Bipolar Schottky TTL devices while maintaining low power dissipation.
• TTL-compatible input thresholds allowing direct interfacing with standard logic families without level shifting requirements.
• Power-down protection on both inputs and outputs prevents device destruction during supply voltage mismatches or hot insertion events.
• High ESD tolerance exceeding 2000V via Human Body Model and over 300mA latch-up performance ensures robust reliability.

Signal Switches, Multiplexers, Decoders Applications

• Logic-level translation between 3.0V CMOS logic and 5.0V CMOS logic systems.
• Demultiplexing operations where data gating is required based on address inputs.
• Interfacing 5V circuits to 3V circuits utilizing overvoltage tolerant input structures.
• Address decoding in digital systems requiring dual independent 2-to-4 decoding functions.

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix 'R2' corresponds to the SOIC-16 tape and reel packaging configuration as defined in the manufacturer's ordering information. Confirm that the component meets RoHS compliance standards for your region. Ensure the procurement source provides valid traceability documentation for the semiconductor components. Check for any recent Product Change Notices (PCN) regarding package or material updates before finalizing orders.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when dual independent decoders are needed within a single package to save board space. The VHCT series is appropriate for designs requiring CMOS low power consumption but needing speed comparable to older TTL technologies. Consider the 2V to 5.5V operating range if the system utilizes varying supply voltages. The active-low outputs are suitable for driving loads that require low-state activation. Verify thermal requirements against the specified junction temperature limits for your application environment.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the MC74VHCT139A product line, which represents an advanced version of the standard 74VHCT logic family. It is designed to replace older bipolar technologies in applications demanding lower power and higher integration. The device integrates two separate 2-to-4 decoders, each with its own enable input, into a compact SOIC-16 surface-mount package. This context places it within the broader category of high-density digital logic ICs used in consumer and industrial electronics.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct pin-compatible replacements include other manufacturers' 74VHCT139 variants such as those from Nexperia or Texas Instruments. Ensure substitute parts maintain the same VHCT input threshold characteristics and output drive capabilities. Verify that alternative packages match the physical dimensions and thermal resistance specifications of the original SOIC-16 footprint. Cross-reference datasheets for propagation delay and leakage current differences to ensure functional equivalence.