MS22 22103-A

Inrush Current Limiters (ICL) Overview

The Vishay Ametherm MS22 22103-A is a Negative Temperature Coefficient (NTC) thermistor belonging to the MegaSurge MS22 series, designed as an inrush current limiter. It features a 22mm disc diameter with radial leads for PCB mounting. The component exhibits a nominal resistance of 220 Ohms at 25°C with a tolerance of ±25%. It supports a maximum steady-state current of 3.5 A and withstands voltage ratings of 115 VAC and 230 VAC. Physical dimensions include a 7.8 mm lead spacing and a 1 mm lead diameter.

Inrush Current Limiters (ICL) Feature Summary

• Utilizes NTC thermistor technology to provide high initial resistance that decreases as temperature rises, effectively limiting surge currents during power-up.
• Constructed with radial leads for secure through-hole PCB mounting, ensuring mechanical stability in electronic assemblies.
• Complies with UL safety standards, providing certified protection for sensitive electronic components against damaging inrush currents.

Inrush Current Limiters (ICL) Applications

• Protection of switching power supplies from high inrush currents during startup
• Surge current limitation in AC/DC converters and power adapters
• Inrush current suppression in transformer primary circuits

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific suffix 'A' against official Vishay Ametherm documentation to confirm if it denotes a distinct variant or packaging specification compared to the standard MS22 22103. Ensure the selected part matches the required thermal and electrical characteristics for the target application. Cross-reference datasheets for any updates regarding RoHS compliance or material declarations prior to procurement.

Inrush Current Limiters (ICL) Selection Notes

Select this component based on the 220 Ohm cold resistance and 3.5 A steady-state current rating to match the circuit's operational requirements. Consider the 22mm package size for adequate heat dissipation and physical clearance on the PCB. Verify that the 7.8 mm lead pitch aligns with the board layout. Ensure the operating environment remains within the specified temperature range to maintain effective inrush limiting performance.

Inrush Current Limiters (ICL) Part Context

The MS22 22103-A belongs to the MegaSurge MS22 series of inrush current limiters manufactured by Vishay Ametherm. This series is widely used in consumer electronics and industrial power supplies. The component serves as a critical protective element, preventing damage to rectifiers, capacitors, and other downstream components caused by high initial charging currents when power is applied.

Inrush Current Limiters (ICL) Replacement Considerations

Potential substitutes include the MS22 22103 and MS2222103B, provided they meet the 220 Ohm resistance and 3.5 A current requirements. Verify that alternative parts offer compatible voltage ratings and physical dimensions for direct replacement without PCB modifications.