ST5R002B

Overview

The ST5R002B is a radial lead inrush current limiter (ICL) manufactured by Littelfuse Inc. It utilizes specially formulated NTC thermistor technology to limit initial surge currents during power-up. The component features a nominal resistance of 5 Ohms with a tolerance of ±20% at 25°C. It supports a maximum steady-state current of 2A and has a body diameter of 15.24mm (0.600 inches).

Feature Summary

• Utilizes NTC thermistor technology for effective inrush current limitation.
• Radial lead configuration suitable for through-hole mounting.
• Designed for protection against surge currents during power-up phases.

Applications

• Power supply input stages
• Electronic ballast circuits
• General consumer electronics

Procurement Notes

Verify the specific Littelfuse datasheet revision when sourcing, as specifications may be subject to change without notice. Confirm that the 5 Ohm resistance and 2A current rating align with the thermal and electrical requirements of the target circuit design prior to final procurement.

Selection Notes

Select this component based on the required steady-state current handling and initial surge suppression needs. Ensure the operating temperature range accommodates the application environment. Consider the physical dimensions and lead spacing for PCB layout compatibility.

Part Context

This part belongs to the ST Series of Inrush Current Limiters from Littelfuse. These devices are distinct from fuses or TVS diodes, serving specifically as NTC thermistors to manage transient currents rather than providing overcurrent protection or voltage clamping.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify cross-reference data directly with Littelfuse technical support or authorized distributors for equivalent components.

FAQ

What is the primary function of the ST5R002B?

It functions as an inrush current limiter using NTC thermistor technology to reduce surge currents during power-up.

What is the steady-state current rating?

The maximum steady-state current rating is 2A.