ST5R007B

Overview

The ST5R007B is a power thermistor manufactured by Littelfuse Inc., classified as an inrush current limiter (ICL). This component features a nominal resistance of 5 ohms and supports a maximum steady-state current of 7 amperes. The device utilizes a ceramic construction with a diameter of 23.5 mm, designed to protect electronic circuits from high initial surge currents during power-up phases.

Feature Summary

• Provides effective limitation of high inrush currents during circuit initialization
• Utilizes positive temperature coefficient characteristics for automatic reset functionality
• Constructed with robust ceramic materials for thermal stability

Applications

• Power supply input protection
• Transformer inrush current limiting
• Capacitive load switching protection

Procurement Notes

Verify the current manufacturing status before procurement, as this specific part number may be discontinued or subject to non-cancelable terms. Confirm regional availability through authorized distributors, as some regions may not currently stock this item. Ensure compliance with any applicable tariff regulations if shipping to the United States. Validate that the replacement specifications meet the original design requirements.

Selection Notes

Select this component based on its 5-ohm resistance value and 7A current rating to match the specific inrush current profile of the target application. Consider the physical dimensions of the 23.5 mm package for adequate spacing and mounting. Evaluate the thermal dissipation requirements within the enclosure to ensure reliable operation under continuous load conditions without excessive heating.

Part Context

This component belongs to the power thermistor category within Littelfuse's circuit protection portfolio. It serves as a passive protective element designed to mitigate electrical stress during startup. The product line focuses on providing reliable surge protection for various electronic systems requiring controlled current ramp-up.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with alternative ICLs by matching resistance values, current ratings, and physical footprint dimensions.