MF-R250U

Overview

The Bourns MF-R250U is a radial leaded PolySwitch resettable fuse from the MF-R series, designed for overcurrent protection in electronic circuits. It features a hold current of 2.5 A and a trip current of 5 A at maximum voltage ratings of 30 VDC. The device exhibits a maximum resistance of 48 mΩ and operates within a temperature range of -40°C to +85°C. With a lead spacing of 5.1 mm and an uncoated construction, it provides reliable circuit interruption and automatic recovery upon fault clearance.

Feature Summary

• Automatic reset functionality eliminates the need for manual replacement after overcurrent events
• Radial leaded configuration facilitates through-hole PCB mounting with standard lead spacing
• Uncoated design allows for direct thermal coupling and heat dissipation without encapsulation interference

Applications

• Overcurrent protection for portable computing devices and peripherals
• Circuit safeguarding in consumer electronics and telecommunications equipment
• Protection for battery packs and power supply inputs in industrial instrumentation

Procurement Notes

Verify that the specific suffix 'U' corresponds to the uncoated variant required for your thermal management strategy. Confirm that the radial lead pitch matches your PCB footprint specifications. Ensure the application environment remains within the specified -40°C to +85°C operating range to maintain rated performance characteristics.

Selection Notes

Select this component when a 2.5 A hold current and 30 VDC rating align with the system's normal operating parameters. Consider the 48 mΩ impedance impact on low-voltage lines. Evaluate the radial package constraints against available board space and ensure the uncoated body style meets safety and environmental requirements for the target assembly.

Part Context

This part belongs to the Bourns MF-R series of PTC resettable fuses, which are widely used for secondary protection in various electronic assemblies. The MF-R250U specifically addresses applications requiring moderate current handling with a compact radial form factor. It serves as a cost-effective alternative to traditional one-time fuses in designs prioritizing serviceability and reduced maintenance overhead.

Replacement Considerations

The MF-R250-99 is a related variant within the same series but utilizes bulk packaging instead of reel packaging. Verify if the packaging difference impacts your manufacturing process. Both parts share identical electrical ratings including 2.5 A hold current and 30 VDC maximum voltage.