SL2212102

Overview

The SL2212102 is a negative temperature coefficient (NTC) thermistor inrush current limiter from the Vishay Ametherm SL22 series. It features a nominal resistance of 120 Ohms with a tolerance of ±25% at 25°C. The component supports a maximum steady-state current of 2 A and has a physical diameter of 22 mm (0.866 inches). It utilizes radial leads with a spacing of 7.8 mm (0.307 inches) for PCB mounting.

Feature Summary

• Provides effective protection against high inrush currents during power-up sequences
• Utilizes NTC thermistor technology to reduce resistance as temperature increases
• Designed for radial through-hole PCB mounting applications

Applications

• Transformer inrush current limiting
• Capacitive load protection
• Power supply input stages

Procurement Notes

Verify the specific suffix requirements for your design, as variants like MS2212102B exist with different dimensions. Confirm UL approval status if required by your target market regulations. Check lead times as availability may vary between distributors. Ensure thermal management considerations align with the component's energy handling capabilities.

Selection Notes

Select this component when a 120 Ohm initial resistance and 2 A steady-state current rating are required. Consider the 22 mm diameter for board space constraints. Evaluate the ±25% resistance tolerance against circuit sensitivity. Compare against the SL221R020 for higher current or lower resistance needs.

Part Context

This part belongs to the SL22 series of inrush current limiters manufactured by Vishay Ametherm. The series offers various resistance and current ratings within a standardized 22 mm form factor. It is distinct from the MegaSurge (MS) series which may offer different dimensional profiles.

Replacement Considerations

The MS2212102B is a related variant with a 23 mm diameter. Direct substitution requires verifying mechanical fitment due to the dimension difference. Other SL22 series parts may serve as alternatives if electrical parameters differ.