MC74AC139DR2

Overview

The MC74AC139DR2G is a dual 2-to-4 line decoder/demultiplexer from the onsemi 74AC logic series. It operates within a supply voltage range of 2 V to 6 V and features two independent decoding circuits in a single SOIC-16 package. The device supports surface-mount installation and functions reliably across an operating temperature range of -40°C to +85°C. Outputs are active-low, providing inverted signals for each decoded address input combination.

Feature Summary

• Dual independent 2-to-4 line decoding functionality
• Active-low output states for precise signal selection
• Wide supply voltage compatibility for flexible system integration

Applications

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

Procurement Notes

Verify the complete part number includes the 'G' suffix (MC74AC139DR2G) as this indicates RoHS compliance and specific manufacturing lot codes. Confirm the package type matches the design requirement, as variations exist between standard SOIC and TSSOP formats. Ensure the ordering quantity aligns with the manufacturer's standard reel size to avoid cut-tape handling issues.

Selection Notes

Select this component when dual independent decoding channels are required within a compact surface-mount footprint. The AC series offers higher speed performance compared to standard 74LS equivalents while maintaining CMOS power efficiency. Verify that the 2V to 6V operating range covers the target system's voltage rails and that the -40°C to +85°C temperature rating meets environmental specifications.

Part Context

This device belongs to the widely adopted 74AC family of high-speed CMOS logic devices. It serves as a functional equivalent to other industry-standard dual decoders but is specifically manufactured by onsemi using their proprietary process technology. The part is designed to replace older discrete decoding solutions or lower-speed logic families in modern electronic designs requiring reliable address decoding.