MC74ACT139DG

Overview

The MC74ACT139DG is a dual 1-of-4 decoder/demultiplexer from the 74ACT logic series, manufactured by onsemi. It operates within a supply voltage range of 4.5 V to 5.5 V and features two independent decoding circuits in a single SOIC-16 package. The device supports surface-mount installation and functions reliably across an extended temperature range from -40°C to +85°C. Designed for high-speed digital applications, it provides active-low outputs with enable inputs for precise signal routing and address decoding tasks.

Feature Summary

• Contains two independent 1-of-4 decoders or demultiplexers within a single integrated circuit package
• Features active-low outputs that assert a low state when enabled and selected
• Includes dedicated enable inputs to control the activation of each decoder section independently
• Utilizes ACT CMOS technology to ensure compatibility with TTL input levels while maintaining low power consumption

Applications

• Address decoding in microprocessor-based systems
• Signal routing and data distribution in digital communication interfaces
• Control logic for peripheral selection in embedded designs
• Demultiplexing operations in memory subsystems

Procurement Notes

Verify the specific suffix 'DG' corresponds to the SOIC-16 package and lead-free composition as documented in official datasheets. Confirm RoHS compliance status through manufacturer declarations. Ensure ordering quantities align with standard tube packaging specifications provided by onsemi. Cross-reference part numbers with authorized distributors to validate authenticity and traceability before procurement.

Selection Notes

Select this component when dual independent decoding channels are required in a compact surface-mount form factor. The ACT series offers faster switching speeds compared to standard AC variants while maintaining pin compatibility. Verify that the 4.5V to 5.5V operating voltage matches the system power rails. Consider the SOIC-16 footprint constraints during PCB layout design to ensure adequate thermal dissipation and signal integrity.

Part Context

This device belongs to the extensive 74ACT family of logic ICs, widely used in industrial and consumer electronics. It serves as a functional equivalent to other dual decoder chips but distinguishes itself through optimized speed and power characteristics inherent to the ACT process. The MC74ACT139DG complements other onsemi logic products like encoders and multiplexers for complete data path solutions.

Replacement Considerations

Direct substitutes include MC74AC139DG for AC-series performance or MC74HC139DG for HC-series compatibility. Verify pinout consistency and electrical parameters such as propagation delay and drive current when cross-referencing alternative manufacturers. Ensure replacement parts maintain the same SOIC-16 package dimensions for board-level interchangeability.