MC74ACT139M

Overview

The MC74ACT139M is a high-speed, dual 1-of-4 decoder/demultiplexer from the 74ACT logic series. It contains two independent decoders, each accepting two address inputs and one enable input to activate one of four active-low outputs. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports surface-mount installation in a 16-pin SOEIAJ package. It functions across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Dual independent 1-of-4 decoding architecture
• Active-low output states for precise signal selection
• High-speed CMOS performance compatible with standard logic levels

Applications

• Address decoding in microprocessor systems
• Data routing in digital communication circuits
• Memory chip select generation

Procurement Notes

Verify the specific suffix 'M' corresponds to the SOEIAJ package variant rather than standard SOIC. Confirm RoHS compliance status for the specific manufacturing batch. Ensure the component matches the 74ACT series specifications regarding voltage and speed requirements for your design.

Selection Notes

Select this component when dual independent decoding channels are required in a compact surface-mount footprint. The ACT series offers faster switching speeds compared to standard HC or HCT variants while maintaining CMOS power efficiency. Verify that the 5V operating voltage aligns with the system's power rails.

Part Context

This part belongs to the onsemi 74ACT family of logic ICs, designed for high-speed digital applications. It serves as a functional equivalent to other industry-standard dual 1-of-4 decoders but is distinguished by its specific packaging and manufacturer-specific electrical characteristics defined in the official datasheet.

Replacement Considerations

Cross-reference with MC74ACT139DR2G for identical functionality in a different SOIC-16 package. Check MC74HC139ADR2G if lower voltage operation or wider temperature ranges are needed, noting the HC series differences.