MF-R800

Overview

The Bourns MF-R800 is a radial lead PTC resettable fuse from the Multifuse MF-R series, designed for low-voltage power supply protection. It features a hold current of 8A and a trip current of 16A at a maximum DC voltage of 30V. The component has an initial resistance of 5mΩ minimum and a post-trip resistance of 30mΩ maximum. It supports a maximum current of 40A with a power dissipation of 4W. Operating within -40°C to +85°C, it utilizes flame-retardant epoxy polymer insulation compliant with UL 94V-0 standards.

Feature Summary

• Radial lead construction with cured, flame-retardant epoxy polymer insulation
• RoHS compliant and halogen-free design
• Meets UL 94V-0 requirements for insulation material

Applications

• Computer and peripheral circuit protection
• General electronics load protection
• Low-voltage power supply overcurrent safeguarding

Procurement Notes

Verify the specific package configuration when ordering, as the MF-R series may be supplied in bulk bags or tape-and-reel formats depending on quantity requirements. Confirm that the 10.2mm lead pitch matches your PCB layout constraints. Ensure the 30VDC rating aligns with your system's operating voltage to maintain proper safety margins during normal operation.

Selection Notes

Select this component for applications requiring a high holding current of 8A in a compact radial package. The 30VDC rating limits its use to low-voltage circuits. Consider the 18.8-second trip time at 16A when designing for fast fault response. Verify thermal management capabilities given the 4W power dissipation rating under fault conditions.

Part Context

The MF-R800 belongs to Bourns' Multifuse MF-R series of PTC resettable fuses. This family provides general-purpose circuit protection for various electronic devices. The series is characterized by its radial lead style and epoxy encapsulation, distinguishing it from surface-mount alternatives like the MF-USHT or MF-RG series which offer different voltage ratings or temperature performances.

Replacement Considerations

For higher voltage applications, consider the MF-RG800 (16V) or other MF-R series variants with appropriate voltage ratings. Direct substitutes must match the 8A hold current and 16A trip current specifications. Verify that any replacement maintains the same radial lead pitch and epoxy insulation type for mechanical and regulatory compatibility.