FSUSB31L8X

Analog Switches - Special Purpose Overview

The FSUSB31L8X is a low-power, single-port Hi-Speed USB 2.0 switch manufactured by onsemi (formerly Fairchild Semiconductor). It functions as a DPST analog switch designed for portable applications requiring minimal power consumption. The device supports data rates up to 480Mbps and operates within a supply voltage range of 3V to 4.3V. Key electrical parameters include a maximum on-resistance of 10 ohms and a -3dB bandwidth of 720MHz. It features break-before-make switching characteristics to prevent signal glitches during channel selection. The component is housed in an 8-MicroPak package, which is equivalent to an 8-UFQFN form factor, suitable for surface-mount installation.

Analog Switches - Special Purpose Feature Summary

• Supports Hi-Speed USB 2.0 data transmission at 480Mbps with low insertion loss
• Features break-before-make switching action to ensure signal integrity during port selection
• Designed for ultra-low power operation suitable for battery-powered portable devices

Analog Switches - Special Purpose Applications

• Portable computers and notebooks for USB hub expansion
• Mobile phones and handheld devices requiring USB connectivity management
• Digital cameras and other consumer electronics with USB ports

Analog Switches - Special Purpose Procurement Notes

Verify the current status of this component, as it is listed as obsolete or discontinued by the manufacturer. Check for official Product Change Notices (PCN) regarding end-of-life notifications. Ensure that any replacement parts are validated against the original datasheet specifications to maintain system compatibility and performance standards.

Analog Switches - Special Purpose Selection Notes

Select this component when designing circuits that require a single-channel USB 2.0 switch with low power consumption. The 8-MicroPak package is ideal for space-constrained designs. Ensure the design accommodates the 3V to 4.3V operating voltage range. Consider the 10-ohm on-resistance impact on signal integrity for high-speed data lines.

Analog Switches - Special Purpose Part Context

The FSUSB31L8X belongs to the FSUSB31 family of USB switches from Fairchild Semiconductor, now part of onsemi. This family includes variants like the FSUSB31K8X. These components are specifically engineered for USB 2.0 compliance, offering a compact solution for managing USB connections in mobile and portable electronic devices where power efficiency and board space are critical constraints.

Analog Switches - Special Purpose Replacement Considerations

Consult the manufacturer's official substitution guide for verified alternatives. Generic USB switches may not match the specific break-before-make timing or power profiles required for USB 2.0 compliance.