74ACT399SJX

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74ACT399SJX is a Quad 2-Port Register belonging to the ACT series of CMOS logic devices. It functions as a 4 x 2:1 multiplexer integrated circuit, designed for routing one of four input signals to an output. The component utilizes a 16-SOP surface mount package and operates within the standard ACT logic family specifications.

Signal Switches, Multiplexers, Decoders Feature Summary

• Quad 2-Port Register architecture enabling simultaneous data latching across four channels
• Multiplexer functionality allowing selection between two input ports per channel
• CMOS construction providing low power consumption characteristics typical of the ACT series

Signal Switches, Multiplexers, Decoders Applications

• Data routing in digital communication systems
• Signal selection in microprocessor interface circuits
• Parallel-to-serial conversion stages in data acquisition

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific manufacturer source, as this part number appears across multiple distributors including Fairchild, ON Semiconductor, and Rochester Electronics. Confirm the exact suffix designation matches your board requirements. Check RoHS compliance status directly with the supplier documentation prior to ordering.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a compact surface mount solution is required for quad multiplexing applications. Ensure the SOP-16 footprint aligns with the PCB layout. Verify voltage levels match the system supply range for the ACT logic family before integration into the design.

Signal Switches, Multiplexers, Decoders Part Context

This device is part of the broader 74ACT logic family, which offers high-speed performance comparable to TTL but with CMOS power efficiency. The 74ACT399 variant specifically provides register and multiplexing capabilities, distinguishing it from simple gate or buffer components within the same series.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Equivalent parts include the 74ACT399SC and 74ACT399SCT from Fairchild/ON Semiconductor. Cross-reference with Texas Instruments or Rochester Electronics versions if sourcing availability is limited, ensuring pin compatibility remains identical.