FSA221MUX

Audio Special Purpose Overview

The FSA221MUX is a Double-Pole, Double-Throw (DPDT) multiplexer manufactured by onsemi (formerly Fairchild Semiconductor). It combines a low-distortion audio switch path with a USB 2.0 High-Speed (HS) signal path, enabling the sharing of D+/D- lines from a USB connector with stereo audio CODEC outputs. The device is housed in a compact 10-lead MSOP package and operates within a supply voltage range of 3V to 5.5V.

Audio Special Purpose Feature Summary

• Single DPDT analog switch configuration
• Integrates USB 2.0 Hi-Speed and Audio switching paths
• Low distortion for high-fidelity audio applications
• Supply voltage range: 3V to 5.5V
• Operating temperature range: -40°C to +85°C
• Package: 10-MSOP (SMD)

Audio Special Purpose Applications

• Portable multimedia devices
• USB peripherals requiring audio output sharing
• Mobile phones and digital cameras
• Laptops and notebooks

Audio Special Purpose Procurement Notes

This component is produced by onsemi. Note that the product lifecycle status is 'End of Life' (EOL); the manufacturer has announced it will be discontinued. Verify stock availability carefully as supplies are limited. Ensure the order specifies the MUX suffix for the MSOP-10 package variant.

Audio Special Purpose Selection Notes

Select this component when a single switch is required to route both USB differential pairs and stereo audio signals simultaneously. The 6 Ohm max on-resistance and 720 MHz bandwidth support USB 2.0 High-Speed data rates. The 10-MSOP package is suitable for space-constrained designs.

Audio Special Purpose Part Context

The FSA221 series includes variants such as the FSA221UMX (UMLP-10 package) and other pin-compatible options. The FSA221MUX specifically refers to the MSOP-10 package version. onsemi acquired Fairchild Semiconductor's semiconductor business, so datasheets may bear either branding depending on the publication date.