SL121R308

Inrush Current Limiters (ICL) Overview

The SL121R308 is a negative temperature coefficient (NTC) thermistor inrush current limiter from the Vishay Ametherm SL12 series. It features a nominal resistance of 1.3 ohms with a tolerance of ±20% at 25°C. The component supports a maximum steady-state current of 8 A and has a mechanical diameter of 12 mm. It is designed for radial lead mounting on printed circuit boards.

Inrush Current Limiters (ICL) Feature Summary

• Provides effective suppression of high inrush currents during power-up sequences
• Utilizes NTC material properties to reduce resistance as temperature increases
• Offers robust thermal performance with defined energy absorption capabilities

Inrush Current Limiters (ICL) Applications

• Power supply input stages
• Transformer primary circuits
• Motor drive protection

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific ordering suffix and package variant against the official datasheet to ensure compatibility with your assembly requirements. Confirm that the 8 A steady-state current rating meets the operational load conditions. Check for UL approval status if required by your safety standards. Ensure the 12 mm form factor fits within the designated PCB footprint constraints.

Inrush Current Limiters (ICL) Selection Notes

Select this component when an 8 A continuous current capacity is required alongside a 1.3 ohm initial resistance. Consider the 40 Joule max recommended energy limit for capacitive loads. Evaluate the 12 mm diameter for spatial constraints. Compare against other SL12 variants if different resistance or current ratings are needed for alternative circuit designs.

Inrush Current Limiters (ICL) Part Context

This part belongs to the SL12 series of axial and radial leaded inrush current limiters. These components are widely used in industrial and consumer electronics to protect sensitive downstream components from startup surges. The series offers various resistance and current combinations to suit diverse power applications.

Inrush Current Limiters (ICL) Replacement Considerations

Consult the official Vishay Ametherm cross-reference documentation for verified substitute part numbers. Do not assume functional equivalence based solely on similar resistance values without verifying current ratings and physical dimensions.