FSA839UCX-SB82278

Analog Switches, Multiplexers, Demultiplexers Overview

The FSA839UCX is a high-speed analog switch manufactured by Fairchild Semiconductor, designed for portable applications requiring low power consumption and fast signal switching. It features a single-pole double-throw (SPDT) configuration with one common input and two selectable outputs. The device operates within a supply voltage range of 1.65V to 3.6V, ensuring compatibility with modern low-voltage digital systems. Key electrical characteristics include a typical on-resistance of 2.5 ohms and an extremely low leakage current of less than 10nA at 3.3V. The switch supports bidirectional data transfer with a bandwidth exceeding 500MHz, making it suitable for video and audio signal routing in mobile devices.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Ultra-low on-resistance ensures minimal signal attenuation and distortion during transmission.
• Low standby current extends battery life in portable electronic devices.
• High-speed switching capability supports high-bandwidth data and video signals.
• Small footprint package facilitates dense PCB layouts in compact handheld electronics.

Analog Switches, Multiplexers, Demultiplexers Applications

• Video signal switching in mobile phones and tablets
• Audio path selection in portable media players
• Data line protection and switching in USB interfaces
• Signal multiplexing in consumer electronics

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify the specific suffix SB82278 against official Fairchild or ON Semiconductor documentation to confirm tape-and-reel specifications and lot traceability requirements. Ensure the component meets RoHS compliance standards as per current manufacturing guidelines. Cross-reference the part number with authorized distributors to avoid counterfeit sources. Confirm that the operating temperature range aligns with your system's environmental constraints before finalizing procurement orders.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select this component when designing circuits that require low-power, high-speed signal routing in space-constrained portable devices. The SPDT topology is ideal for selecting between two signal sources or destinations. Consider the 1.65V minimum operating voltage if interfacing with low-voltage logic families. The small UDFN package size makes it preferable over larger packages when board real estate is limited. Evaluate the on-resistance variation across temperature if precise signal integrity is critical for high-frequency applications.

Analog Switches, Multiplexers, Demultiplexers Part Context

The FSA839 series belongs to Fairchild's portfolio of high-performance analog switches designed for multimedia applications. These components are engineered to provide reliable signal switching with minimal impact on signal quality. The UCX suffix typically denotes a specific tape-and-reel packaging format optimized for automated surface-mount assembly processes. This family is widely used in smartphones, PDAs, and other mobile gadgets where power efficiency and signal fidelity are paramount.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

Check for direct pin-compatible replacements from ON Semiconductor, which acquired Fairchild's semiconductor business. Verify that any substitute maintains the same SPDT configuration, voltage range, and package dimensions. Ensure the alternative device offers comparable on-resistance and leakage current specifications to maintain circuit performance without redesign.