MF-USML300-2

Overview

The Bourns MF-USML300-2 is a surface-mount polymer positive temperature coefficient (PPTC) resettable fuse from the Multifuse USML series. It provides overcurrent protection with a hold current of 3.0 A and a trip current of 6.0 A. The device features a maximum voltage rating of 60 V and a maximum fault current capacity of 100 A. It operates within a standard ambient temperature range and utilizes a compact SMD package suitable for automated assembly.

Feature Summary

• Provides robust overcurrent protection in demanding high-voltage and high-temperature environments
• Eliminates nuisance tripping caused by ambient temperature variations
• Offers space-saving surface mount design for flexible layout integration

Applications

• Automobile circuitry protection
• Overcurrent surge protection for high reliability electronic equipment
• Resettable fault protection for industrial transportation systems
• Communication and security equipment circuits
• Consumer electronic device power lines

Procurement Notes

Verify that the specific part number matches the required hold and trip currents for the target application. Confirm compliance with relevant safety agency certifications such as UL and TÜV before finalizing procurement. Ensure the selected component meets the thermal and electrical requirements of the end-use environment to guarantee reliable circuit safeguarding performance.

Selection Notes

Select this component when space-constrained layouts require a compact surface mount solution rather than radial leaded devices. Choose based on the specific hold current and maximum voltage ratings needed for the protected circuit. Consider the operating temperature range and fault current capacity to ensure adequate protection against short circuits without unnecessary tripping during normal operation.

Part Context

This component belongs to the Multifuse USML series, which represents a line of low ohmic polymer PTC resettable fuses designed for surface mount applications. The series provides increased resistance protection while maintaining a small footprint. It is engineered to replace traditional fusible links in various electronic assemblies requiring reliable overcurrent safeguarding.

Replacement Considerations

Consult official Bourns documentation for confirmed substitute part numbers within the Multifuse family. Verify that any replacement maintains identical or superior electrical ratings including hold current, trip current, and voltage specifications. Ensure mechanical compatibility with the existing surface mount footprint and soldering process.