ST20001C

Overview

The ST20001C is an inrush current limiter manufactured by Littelfuse Inc. This component features a nominal resistance of 20 Ohms with a tolerance of ±20%. It is rated for a maximum continuous current of 300 mA. The device utilizes a radial leaded package configuration with a body diameter of 0.350 inches (8.89mm).

Feature Summary

• Provides inrush current limiting functionality to protect downstream components during power-up.
• Utilizes a radial leaded form factor suitable for through-hole mounting applications.

Applications

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

Procurement Notes

Verify the specific part number suffix against manufacturer documentation to confirm exact electrical characteristics and package dimensions. Ensure compatibility with the target circuit's voltage and current requirements before integration. Cross-reference datasheet specifications for thermal management needs.

Selection Notes

Select this component based on the required steady-state resistance value and maximum operating current limits. Confirm that the physical package dimensions fit the available PCB footprint. Evaluate the thermal dissipation capabilities relative to the expected ambient temperature and duty cycle of the application.

Part Context

This part belongs to the category of inrush current limiters, which are passive components designed to manage transient currents. These devices typically exhibit negative temperature coefficient characteristics, allowing them to restrict initial surge currents while maintaining low resistance during normal operation.

Replacement Considerations

Consult official Littelfuse documentation for verified substitute part numbers. Do not assume interchangeability with other brands or series without validating electrical parameters and mechanical fit against the original specification sheet.