FSA266K8X

Overview

The FSA266K8X is a high-speed USB 2.0 switch IC manufactured by onsemi, designed for portable applications requiring efficient power management and signal integrity. It features a single DPST configuration with an ultra-low on-resistance of 1.5 ohms maximum, ensuring minimal signal degradation during data transmission. The device operates within a supply voltage range of 3.0 V to 4.3 V, supporting standard USB power rails. Key electrical parameters include a maximum propagation delay of 30 ns and an idle time of 25 ns, facilitating rapid switching transitions. It maintains a quiescent current of just 1 µA in the off state, contributing to extended battery life in mobile devices. The component supports a bandwidth of 720 MHz, suitable for high-speed data rates up to 480 Mbps. Operating temperatures range from -40°C to +85°C, providing reliability across diverse environmental conditions. The unit weighs approximately 30 mg and is housed in a compact US-8 package.

Feature Summary

• Ultra-low on-resistance minimizes signal loss for high-fidelity data transfer
• Single microampere standby current optimizes battery efficiency in portable electronics
• High-speed switching capability supports USB 2.0 high-speed data rates
• Compact surface-mount packaging facilitates dense board layouts

Applications

• Portable media players and MP3 devices
• Mobile handsets and smartphones
• Digital cameras and camcorders
• USB hubs and docking stations

Procurement Notes

Verify the specific ordering suffix to confirm package type and tape/reel specifications, as variations may exist within the same base part number. Confirm RoHS compliance status through official documentation prior to integration. Check for end-of-life notices or obsolescence warnings directly from the manufacturer to ensure long-term supply chain stability. Validate that the selected variant matches the required thermal and electrical ratings for the target application environment.

Selection Notes

Select this component when low insertion loss and minimal power consumption are critical for USB 2.0 signal routing in space-constrained designs. Ensure the operating voltage aligns with the system's 3.3 V rail. Consider the US-8 package dimensions against available PCB real estate. Verify that the required switching speed meets the timing constraints of the connected peripherals. Compare against alternative switches if higher channel counts or different logic levels are needed.

Part Context

The FSA266K8X belongs to onsemi’s FSA series of USB switch ICs, which are engineered for high-performance multimedia and communication applications. This series emphasizes low power consumption and small form factors to support the miniaturization trends in consumer electronics. The K8X suffix typically denotes a specific tape and reel packaging option for automated assembly processes.

Replacement Considerations

Direct substitutes may include other single DPST USB switches from onsemi or competitors with similar 1.5 ohm on-resistance and US-8 packaging. Verify pin compatibility and electrical characteristics before substitution. Alternative packages like SOT-363 may require schematic and layout modifications.