ST25002C

Overview

The ST25002C is an inrush current limiter (ICL) manufactured by Littelfuse Inc. It features a nominal resistance of 25 Ohms with a tolerance of ±20%. The device supports a maximum steady-state current of 2 A and has a diameter of 13.97 mm (0.550 inches). The lead spacing is 5.08 mm (0.200 inches), and the initial resistance at room temperature is specified as 640 mOhms.

Feature Summary

• Provides effective limitation of high inrush currents during power-up sequences to protect sensitive electronic components.

Applications

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

Procurement Notes

Verify the specific Littelfuse datasheet for the ST25002C to confirm thermal characteristics and derating curves. Ensure the application environment does not exceed the component's maximum operating temperature limits. Cross-reference the physical dimensions and lead spacing with the PCB footprint requirements before finalizing the design.

Selection Notes

Select this component based on the required nominal resistance value and the maximum steady-state current rating of 2 A. Consider the initial low resistance state and the subsequent increase in resistance as the device heats up during operation. Verify that the 13.97 mm diameter fits within the available board space.

Part Context

This part belongs to the category of inrush current limiters, which are typically made from positive temperature coefficient materials. These devices act as self-regulating resistors that start with low resistance and increase resistance as current flows and heat is generated, thereby limiting peak current.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Consult Littelfuse official resources for equivalent series or alternative manufacturers offering similar ICL specifications.