FSA553UCX

Analog Switches - Special Purpose Overview

The FSA553UCX 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 supports a maximum DC switch current of 350 mA. The device features a maximum on-resistance of 600 mOhms, with a typical turn-on time of 445 µs and turn-off time of 175 µs. Power consumption is limited to a maximum of 120 µA. It functions reliably across an operating temperature range from -40°C to +85°C and is housed in a compact WLCSP-9 surface-mount package.

Analog Switches - Special Purpose Feature Summary

• Dual SPST configuration optimized for audio signal path switching
• Depletion mode architecture enabling low-voltage operation down to 1.5 V
• Ultra-small WLCSP-9 footprint suitable for high-density mobile designs

Analog Switches - Special Purpose Applications

• Mobile phone audio routing and microphone selection
• Portable media player line-in/line-out switching
• Headset jack detection and audio path management

Analog Switches - Special Purpose Procurement Notes

Verify component authenticity through authorized distribution channels or direct manufacturer engagement. Confirm RoHS compliance status via the official datasheet before integration. Ensure the specific suffix matches design requirements as packaging variations may exist. Validate that the WLCSP-9 package dimensions align with the target PCB layout constraints.

Analog Switches - Special Purpose Selection Notes

Select this component when dual independent audio paths require switching under low-voltage conditions. The depletion mode technology ensures effective isolation without requiring complex biasing circuits. Compare on-resistance specifications against other models if lower insertion loss is critical for high-fidelity applications. Verify thermal performance within the specified industrial temperature range.

Analog Switches - Special Purpose Part Context

This part belongs to the FSA55x series of analog switches designed specifically for portable consumer electronics. It complements related devices like the FSA550 and FSA551 by offering a dual-channel solution in a minimal footprint. The series targets applications where space conservation and low power consumption are primary design drivers.

Analog Switches - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate alternative dual SPST switches from the same manufacturer family only if they share identical pinout and electrical characteristics.