ST20100B

Overview

The ST20100B is a surface-mount inrush current limiter manufactured by Littelfuse Inc. It belongs to the ST series of power thermistors, which are specially formulated negative temperature coefficient (NTC) devices designed for circuit protection. This specific component features a nominal resistance of 200 Ohms with a tolerance of ±20%. It supports a maximum steady-state current of 100 mA and utilizes a compact package dimension of 0.370 inches (9.40mm). These parameters define its electrical behavior and physical footprint for integration into electronic assemblies.

Feature Summary

• Utilizes specially formulated NTC thermistor technology for effective inrush current limitation
• Designed as a surface-mount device for automated PCB assembly processes
• Provides thermal protection against excessive initial current flow during power-up

Applications

• AC-DC power adapter input stages
• Switching power supply circuits
• Consumer electronics power inputs

Procurement Notes

Verify the exact ordering suffix and package variant against the official Littelfuse ST Series datasheet before procurement. Confirm that the 200 Ohm resistance and 100 mA current rating align with the target circuit design requirements. Ensure the surface-mount footprint matches the PCB layout specifications to guarantee proper soldering and mechanical stability during operation.

Selection Notes

Select this component based on the required resistance value and current handling capacity for the specific application. The ST20100B is suitable for designs requiring precise inrush control within the 100 mA range. Consider the thermal environment and mounting orientation when integrating this surface-mount device into the final product architecture.

Part Context

The ST20100B is part of the broader ST Series portfolio from Littelfuse Inc., which focuses on inrush current limiting solutions. These components are categorized as power thermistors intended for protecting sensitive electronic circuits from high initial charging currents. The series offers various resistance values and package options to accommodate different power levels and form factor constraints.

Replacement Considerations

Consult the Littelfuse ST Series cross-reference documentation for verified alternative part numbers. Ensure any substitute maintains identical resistance tolerances and current ratings to preserve circuit protection performance.