SL125R004

Inrush Current Limiters (ICL) Overview

The SL125R004 is a radial leaded inrush current limiter from the Vishay Ametherm SL12 series. It features a 12mm diameter ceramic body with a nominal resistance of 5 Ohms and a tolerance of ±20%. The component is rated for a steady-state current of 4A and supports voltage ratings of 115 VAC and 230 VAC. Designed for PCB mounting, it utilizes radial termination with a standard 7.8 mm lead spacing. The unit carries UL approval for safety compliance.

Inrush Current Limiters (ICL) Feature Summary

• Provides effective suppression of high inrush currents during power-up to protect downstream electronic components
• Features self-resetting thermistor technology that returns to low resistance after thermal stabilization
• Constructed with robust ceramic material suitable for through-hole PCB mounting applications

Inrush Current Limiters (ICL) Applications

• Power supply input stages
• Transformer primary circuits
• Capacitive load protection

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific suffix against the manufacturer datasheet to confirm exact electrical tolerances and physical dimensions. Ensure the selected variant matches the required steady-state current and peak inrush specifications for the target circuit design. Cross-reference the UL file number for regulatory compliance requirements.

Inrush Current Limiters (ICL) Selection Notes

Select this component based on the 5 Ohm resistance value and 4A current rating. Consider the 12mm package size for spatial constraints on the printed circuit board. Evaluate the thermal dissipation characteristics relative to the operating environment and duty cycle requirements of the application.

Inrush Current Limiters (ICL) Part Context

This part belongs to the SL12 series of inrush current limiters manufactured by Vishay Ametherm. The series offers various resistance and current combinations within a standardized 12mm form factor. These components are designed for general-purpose surge protection in AC and DC power systems.

Inrush Current Limiters (ICL) Replacement Considerations

Direct substitutes include other Vishay Ametherm parts within the SL12 series such as SL121R010 or SL125R006 if current or resistance values differ. Verify pin compatibility and thermal performance before substituting with generic NTC thermistors.