ST8R006B

Overview

The ST8R006B is a power thermistor inrush current limiter (ICL) manufactured by Littelfuse Inc. This component is designed to limit the initial surge of electrical current when a device is powered on, protecting sensitive electronic components from damage. The part features an 8-ohm resistance with a tolerance of 20% and supports a maximum steady-state current of 6A. It has a physical dimension of 24.76mm, indicating its form factor for circuit integration.

Feature Summary

• Provides effective inrush current limiting to protect downstream circuitry during power-up events
• Constructed as a power thermistor with stable resistance characteristics under operational loads
• Designed for robust performance in high-current applications requiring surge protection

Applications

• Power supply input stages
• Motor drive circuits
• Transformer primary windings

Procurement Notes

Verify the specific Littelfuse datasheet for detailed thermal derating curves and absolute maximum ratings before finalizing the design. Ensure that the PCB layout accommodates the required spacing for the 24.76mm package size and adequate airflow for heat dissipation. Confirm that the 6A continuous current rating aligns with the peak load requirements of the target application to prevent premature failure or excessive voltage drop.

Selection Notes

Select this component when the application requires a passive, reliable method to suppress high inrush currents without active control logic. The 8-ohm initial resistance is suitable for moderate surge suppression needs where a lower impedance might be insufficient. Consider the thermal mass and recovery time if the system experiences frequent power cycling, as the thermistor must cool down to reset its resistance value for subsequent operations.

Part Context

This part belongs to Littelfuse's portfolio of circuit protection devices, specifically within the category of inrush current limiters. These components are essential for ensuring the longevity and reliability of electronic systems by mitigating the stress caused by sudden power application. The ST8R006B represents a standard solution for general-purpose power conditioning tasks.

Replacement Considerations

Consult Littelfuse official documentation for direct cross-reference part numbers. Verify that any substitute maintains identical resistance values, current ratings, and physical dimensions to ensure compatibility with existing board layouts and thermal management strategies.