MC74AC139DG

Overview

The MC74AC139DG is a dual 1-of-4 decoder/demultiplexer from the 74AC logic family, manufactured by onsemi. It operates within a supply voltage range of 2V to 6V and features two independent decoding circuits in a single package. The component utilizes a 16-pin SOIC surface-mount package and supports an operating temperature range from -40°C to +85°C. Designed for high-speed digital applications, it provides inverted outputs and accepts TTL-compatible input levels, ensuring reliable signal routing in complex logic systems.

Feature Summary

• Dual independent 1-of-4 decoding functionality integrated into a single package
• Compatible with TTL input voltage levels for broad interface support
• Provides active-low (inverted) outputs for direct logic interfacing

Applications

• Address decoding in memory architectures
• Data distribution in demultiplexing circuits
• Control signal routing in industrial automation systems

Procurement Notes

Verify the specific suffix 'DG' confirms the SOIC-16 package and lead-free composition as per onsemi standards. Confirm RoHS compliance status through official documentation before integration. Ensure the ordering part number matches the required tape-and-reel or tube packaging variant if applicable to your assembly process.

Selection Notes

Select this component when dual independent decoding is required within space-constrained designs. The AC series offers faster switching speeds compared to HC counterparts while maintaining CMOS low power consumption. Verify that the 2V to 6V supply range aligns with your system's voltage rails and that the SOIC-16 footprint fits your PCB layout constraints.

Part Context

This device belongs to the MC74AC139 series, which standardizes dual decoder/demultiplexer functions across various manufacturers. The 'AC' designation indicates Advanced CMOS technology, balancing speed and power efficiency. It serves as a functional equivalent to other industry-standard 74AC139 parts, facilitating cross-manufacturer design portability.

Replacement Considerations

MC74ACT139DG: Offers similar functionality but with ACT series performance characteristics. MC74HC139DTR2G: Provides comparable decoding in TSSOP packaging. SN74AC139DR: Texas Instruments alternative with identical logical function.