MF-LR550/20-0

Ptc Resettable Fuses Overview

The MF-LR550/20-0 is a polymeric resettable fuse from the Bourns MF-LR series, designed for overcurrent protection in electronic circuits. It features an axial leaded package suitable for through-hole mounting. The component is rated for a maximum voltage of 20V and holds AEC-Q200 automotive qualification. Key electrical specifications include a hold current of 5.5A, a trip current of 11A, and a maximum fault current capacity of 100A. The device exhibits a time-to-trip characteristic of 5 seconds under specified conditions.

Ptc Resettable Fuses Feature Summary

• Polymeric PTC technology provides automatic circuit recovery after fault clearance
• AEC-Q200 qualified for automotive reliability standards
• Axial leaded construction enables standard through-hole PCB integration

Ptc Resettable Fuses Applications

• Automotive electronics requiring AEC-Q200 compliance
• Overcurrent protection for low-voltage DC circuits
• Consumer electronic device power input stages

Ptc Resettable Fuses Procurement Notes

Verify the specific ordering suffix to confirm package style and termination type. Confirm that the required hold current and trip current ratings align with the target circuit design parameters. Ensure the maximum working voltage meets the system requirements. Check for any specific handling or storage instructions provided in the manufacturer datasheet before assembly.

Ptc Resettable Fuses Selection Notes

Select this component when a resettable protection device is needed for 20V systems. The 5.5A hold current defines the continuous operating limit. The 100A maximum fault current rating determines the surge withstand capability. Consider the thermal environment as trip characteristics are temperature-dependent. Verify compatibility with automated placement equipment due to the axial lead form factor.

Ptc Resettable Fuses Part Context

This part belongs to the Bourns MF-LR series of polymeric resettable fuses. The series offers various current ratings and voltage options. The MF-LR designation indicates a specific family of axial leaded devices. These components serve as alternatives to traditional fusible links by providing reusable protection against overcurrent events.

Ptc Resettable Fuses Replacement Considerations

Littelfuse model LR4-550F is documented as a parametric equivalent. Verify that the substitute matches the 5.5A hold current and 20V rating. Ensure the replacement also meets AEC-Q200 requirements if used in automotive applications. Confirm physical dimensions fit the existing footprint.