ICL121D18MIC

Inrush Current Limiters (ICL) Overview

The ICL121D18MIC is an NTC thermistor from the Eaton ICL series, designed for inrush current limiting. It features a nominal resistance of 12 ohms and a B parameter of 3100 K with J tolerance. The component has a maximum steady-state current rating of 5.5 A and a physical size of 18 mm (0.748 inches). It utilizes I-lead configuration and is packaged in bulk quantities.

Inrush Current Limiters (ICL) Feature Summary

• Provides effective inrush current limitation during power-up sequences
• Features negative temperature coefficient characteristics for self-regulating resistance
• Utilizes robust lead design for secure circuit board mounting

Inrush Current Limiters (ICL) Applications

• Power supply input stages
• Transformer primary circuits
• Capacitor charging protection

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific B-parameter definition (B1) and tolerance class against the official Eaton datasheet to ensure compatibility with thermal management requirements. Confirm that the 12-ohm resistance value aligns with the target inrush current specifications for the intended application circuit.

Inrush Current Limiters (ICL) Selection Notes

Select this component based on the required 12-ohm resistance and 5.5 A current handling capacity. Ensure the 18 mm body size fits within the available PCB area. Consider the 3100 K beta value for accurate temperature-resistance calculations in the operating environment.

Inrush Current Limiters (ICL) Part Context

This part belongs to the Eaton ICL family of inrush current limiters. These components are specifically engineered to protect electronic equipment from high initial charging currents. The ICL121D18MIC variant offers a balance of resistance and current capacity suitable for medium-power applications.

Inrush Current Limiters (ICL) Replacement Considerations

Direct substitutes include other Eaton ICL series parts with similar resistance and current ratings, such as the ICL161D18MIC or ICL700D18MIC, provided their electrical parameters match the system requirements.