MF-R250

Overview

The Bourns MF-R250 is a radial leaded PPTC resettable fuse from the Multifuse MF-R series, designed for overcurrent protection in low-voltage circuits. It features a 2.5 A hold current and a 5.0 A trip current at ambient temperature. The device supports a maximum voltage of 30 V DC and can withstand a maximum fault current of 40 A. Initial resistance is typically 48 mΩ. It operates within a temperature range of -40°C to +85°C and utilizes cured flame-retardant epoxy polymer insulation compliant with UL 94V-0 standards.

Feature Summary

• Provides automatic circuit protection against overcurrent conditions through positive temperature coefficient (PTC) behavior.
• Features radial leads and cured epoxy polymer insulation for secure PCB mounting and environmental resistance.
• Offers repeated reset functionality after fault clearance without requiring component replacement.

Applications

• Computer and peripheral power supply protection
• General electronics circuit safeguarding
• Automotive electronic applications

Procurement Notes

Verify the specific suffix code (e.g., -99, -AP-10, -U-2) as it determines packaging type such as bulk, ammo pack, or reel. Confirm RoHS compliance status via the manufacturer datasheet. Check for obsolete status indicators like NRND before finalizing procurement plans.

Selection Notes

Select based on required hold current (2.5 A) and maximum operating voltage (30 V). Ensure the application environment stays within the specified -40°C to +85°C operational range. Verify that the expected fault current does not exceed the 40 A maximum rating to prevent device damage.

Part Context

This component belongs to the Bourns Multifuse MF-R series of PTC resettable fuses. These devices are engineered for load protection in low-voltage power supplies. The series is characterized by radial lead construction and flame-retardant insulation suitable for various industrial and consumer electronics markets.

Replacement Considerations

Check for direct substitutes within the same MF-R series with identical electrical ratings. Consider variants like MF-R250-AP-10 for different packaging requirements. Verify if newer generations offer improved thermal characteristics while maintaining pin compatibility.

FAQ

What is the maximum fault current the MF-R250 can handle?

The MF-R250 has a maximum rated current of 40 A.

Is the MF-R250 RoHS compliant?

Yes, the MF-R series is RoHS compliant and halogen-free.

What insulation standard does the MF-R250 meet?

The cured epoxy polymer insulation meets UL 94V-0 flame retardant requirements.