FSA551UCX

Analog Switches - Special Purpose Overview

The FSA551UCX is a dual single-pole single-throw (SPST) depletion mode audio switch manufactured by onsemi. It operates within a supply voltage range of 1.5 V to 3 V and features a maximum on-resistance of 600 mOhms. The device supports a DC switch current of 350 mA with a maximum power consumption of 120 uA. It utilizes a 9-ball WLCSP package measuring 1.22x1.22 mm. Switching characteristics include a maximum turn-on time of 445 us and a maximum turn-off time of 175 us. The component functions reliably across an operating temperature range from -40°C to +85°C.

Analog Switches - Special Purpose Feature Summary

• Depletion mode architecture enables low-voltage operation suitable for portable applications
• Dual SPST configuration provides independent channel control in a compact footprint
• Low on-resistance minimizes signal attenuation in audio paths

Analog Switches - Special Purpose Applications

• Audio signal routing in mobile devices
• Headphone jack detection circuits
• Microphone input switching

Analog Switches - Special Purpose Procurement Notes

Verify the End-of-Life status before design finalization, as the manufacturer has announced discontinuation. Confirm RoHS compliance through official documentation. Ensure the specific WLCSP-9 package variant matches the PCB layout requirements. Check for any Product Change Notices affecting assembly or material composition prior to procurement.

Analog Switches - Special Purpose Selection Notes

Select this component when dual-channel audio switching is required under 3 V supply constraints. Compare the 600 mOhm on-resistance against system loss budgets. Evaluate the 9-WLCSP package dimensions against available board space. Consider the slower switching speeds relative to high-speed digital switches if timing is critical.

Analog Switches - Special Purpose Part Context

This part belongs to the FSA551 series of analog switches designed specifically for audio applications. It shares functional similarities with the FSA553 but differs in specific electrical parameters and packaging details. The series targets consumer electronics requiring minimal signal distortion in low-power environments.

Analog Switches - Special Purpose Replacement Considerations

The FSA553UCX is documented as a similar replacement option by distributors. Verify pin compatibility and electrical parameter alignment before substitution. Note that both parts may share the same End-of-Life status.