74ACT139SC

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74ACT139SC is a dual 1-of-4 decoder/demultiplexer from the 74ACT logic family. It operates within a supply voltage range of 4.5 V to 5.5 V and features two independent decoding circuits in a 16-lead SOIC package. The device provides active-low mutually exclusive outputs capable of sourcing and sinking 24 mA, with TTL-compatible inputs for direct interface with TTL systems.

Signal Switches, Multiplexers, Decoders Feature Summary

• Dual independent 1-of-4 decoding functionality
• Active-low mutually exclusive outputs
• TTL-compatible input levels
• High current drive capability

Signal Switches, Multiplexers, Decoders Applications

• Address decoding for memory arrays
• Demultiplexing data streams
• I/O port expansion
• Control signal routing

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific manufacturer designation, as Fairchild Semiconductor is now part of onsemi. Confirm that the component meets current RoHS compliance standards required for your assembly process. Ensure the SOIC-16 package dimensions match your PCB footprint exactly. Check for any obsolescence notices or lifecycle status updates from the current manufacturer before finalizing procurement plans.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when dual independent decoding is required within a single package. The ACT series offers faster switching speeds compared to standard 74LS counterparts while maintaining TTL compatibility. Verify that the 24 mA output drive current meets the load requirements of the connected circuitry. Consider the operating temperature range of -40°C to +85°C for environmental suitability.

Signal Switches, Multiplexers, Decoders Part Context

This component belongs to the 74ACT high-speed CMOS logic family, designed for performance comparable to 74LS but with lower power consumption. The 74ACT139 specifically integrates two separate 1-of-4 decoders, allowing for compact design in systems requiring multiple address lines or control signals. It serves as a critical interface element between microprocessors and peripheral devices.