74ACT139SCX

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74ACT139SCX is a dual 1-of-4 decoder/demultiplexer integrated circuit belonging to the ACT logic series. It features inverted outputs and utilizes CMOS technology housed in a 16-pin Small Outline (SOIC) package. The device operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature range from -40°C to +85°C. Key electrical characteristics include a maximum propagation delay of 10.5 ns at 5V with a 50pF load, output drive capabilities of 24mA for both high and low states, and a maximum static current of 2µA.

Signal Switches, Multiplexers, Decoders Feature Summary

• Dual independent decoding or demultiplexing functionality within a single package
• Inverted output polarity for signal inversion requirements
• High-speed operation suitable for demanding digital applications
• Robust output drive capability for direct interfacing

Signal Switches, Multiplexers, Decoders Applications

• Address decoding in memory systems
• Data distribution in multiplexed networks
• Control signal routing in industrial automation
• Logic level translation in mixed-signal circuits

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix 'X' against the manufacturer's official documentation to confirm tape-and-reel packaging specifications. Ensure compatibility with standard SOIC-16 footprints during PCB layout. Confirm RoHS compliance status through the latest environmental declaration, as manufacturing origins may vary. Cross-reference the datasheet revision date to validate parameter accuracy before finalizing procurement orders.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when dual independent 2-to-4 decoding is required in surface-mount designs. The ACT series offers superior speed compared to legacy LS variants while maintaining pin compatibility. Verify that the 5V supply rail aligns with system power constraints. Consider the inverted output nature when designing downstream logic gates to ensure correct logical state interpretation.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the widely adopted 74ACT family, bridging the performance gap between older TTL standards and modern AC logic. It serves as a direct replacement for earlier 74LS139 equivalents in many designs. The SOIC-16 package provides a compact footprint for space-constrained electronics. Fairchild Semiconductor, now part of onsemi, maintains this lineage for industrial and consumer applications.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct substitutes include the 74ACT139SCT and 74ACT139SC. Verify pinout compatibility before substitution. Alternative manufacturers such as Texas Instruments offer equivalent parts like the SN74ACT139DR. Always consult the specific datasheet for any minor electrical differences between vendors.