SL222R018CT

Overview

The Vishay Ametherm SL222R018CT is a radial lead inrush current limiter (ICL) from the SL22 series. It features a nominal resistance of 2 Ohms with a ±20% tolerance and a steady-state current rating of 18 A. The device supports voltage ratings of 115 VAC and 230 VAC. Physical dimensions include a 22 mm diameter, 6 mm width, 7.8 mm lead spacing, and 1 mm lead diameter. It utilizes PCB mount installation and holds UL approval.

Feature Summary

• Provides effective limitation of high inrush currents during power-up sequences to protect downstream components.
• Utilizes positive temperature coefficient characteristics where resistance increases significantly as the device heats up during operation.
• Features automatic reset capability, returning to low-resistance state upon cooling after power removal.

Applications

• Protection circuits for AC/DC power supplies
• Input stages of motor drives and contactors
• Electronic ballasts and lighting systems

Procurement Notes

Verify that the specific suffix 'CT' aligns with the required packaging configuration, as standard datasheets often list the base part number SL222R018. Confirm that the 18 A steady-state current and 2 Ohm resistance meet the circuit's thermal and electrical requirements. Ensure the 22 mm form factor fits the designated PCB footprint and clearance constraints.

Selection Notes

Select this component when a 2 Ohm initial resistance is required to limit peak inrush current to approximately 18 A in 115 VAC or 230 VAC applications. Consider the thermal mass and cooling time required for the automatic reset function. Compare against other SL series sizes if space or current handling needs differ. Verify compatibility with the specific PCB mounting style and lead spacing.

Part Context

This component belongs to the Vishay Ametherm SL22 series of inrush current limiters. These devices are designed for general-purpose protection against surge currents in electronic equipment. The series offers various resistance and current ratings within a standardized 22 mm package size, ensuring consistent mechanical integration across different design specifications.

Replacement Considerations

The base part number SL222R018 serves as the primary reference. Other variants in the SL22 series may offer different resistance values or current ratings but share similar physical dimensions. Ensure any substitute maintains the 2 Ohm resistance and 18 A rating to preserve circuit protection performance.