MF-RG400-2

Overview

The Bourns MF-RG400-2 is a resettable polymeric positive temperature coefficient (PPTC) device designed for overcurrent protection in electronic circuits. It functions as a self-resetting fuse that transitions to a high-resistance state when excessive current or heat is detected, thereby limiting the flow of electricity to protect downstream components. Once the fault condition is removed and the device cools down, it automatically returns to its low-resistance conducting state, restoring normal circuit operation without requiring manual replacement. This characteristic makes it suitable for applications where accessibility for fuse replacement is limited or inconvenient.

Feature Summary

• Self-resetting functionality eliminates the need for manual component replacement after a fault event
• Acts as an overcurrent and overheating protection device by increasing resistance under fault conditions
• Provides reliable circuit protection through automatic recovery once thermal equilibrium is restored

Applications

• Consumer electronics overcurrent protection
• Portable device battery pack protection
• Industrial control circuit safeguarding
• Telecommunications equipment line protection

Procurement Notes

Verify the specific datasheet version for the MF-RG400-2 to confirm rated voltage, hold current, and trip current values required for your design. Ensure the selected package size matches your PCB footprint requirements. Check RoHS compliance status and lead-free soldering compatibility if applicable to your manufacturing process. Confirm availability with authorized distributors as stock levels may vary.

Selection Notes

Select this component based on the maximum operating voltage and continuous current requirements of your circuit. Ensure the trip current rating is appropriate for the load while providing adequate protection margin. Consider the ambient temperature range and any derating factors necessary for high-temperature environments. Verify that the physical dimensions fit within the designated area on the printed circuit board layout.

Part Context

The MF-RG series represents Bourns' lineup of resettable fuses engineered for compact space-constrained applications. These devices utilize proprietary polymer technology to deliver robust protection against overcurrent events. The RG variant typically indicates specific packaging or performance characteristics tailored for surface-mount assembly processes common in modern electronics manufacturing.

Replacement Considerations

When replacing the MF-RG400-2, ensure the substitute part matches the original rated voltage, hold current, and trip current specifications. Verify that the replacement device has compatible physical dimensions and mounting style. Confirm that the new component meets the same safety certifications and environmental compliance standards as the original part.