MF-RX020/72-AP

Overview

The Bourns MF-RX020/72-AP is a resettable fuse from the PolySwitch RX series, designed for overcurrent protection in electronic circuits. It features a hold current of 0.2 A and a trip current of 0.4 A. The device operates with a maximum voltage rating of 72 V DC and can handle a maximum fault current of 100 A. Its typical resistance is 1.5 Ohms at room temperature, ensuring minimal power loss during normal operation while providing reliable circuit interruption during fault conditions.

Feature Summary

• Provides automatic circuit recovery after fault clearance without manual replacement
• Offers dual-mode protection against both overcurrent and excessive temperature conditions
• Designed for surface mount assembly to facilitate automated manufacturing processes

Applications

• Portable consumer electronics such as mobile phones and tablets
• USB peripheral devices requiring overcurrent protection
• Laptop computers and battery-powered equipment

Procurement Notes

Verify the specific suffix AP indicates the tape and reel packaging configuration suitable for automated placement. Confirm that the voltage and current ratings align with the target circuit design requirements before procurement. Ensure compatibility with the intended soldering profile and reflow conditions specified in the manufacturer's datasheet to maintain device integrity.

Selection Notes

Select this component based on its specific hold and trip current characteristics to match the operational load of the protected circuit. Consider the maximum operating voltage and the ambient temperature range to ensure reliable performance under all expected environmental conditions. Evaluate the physical dimensions to confirm fit within the designated footprint on the printed circuit board.

Part Context

This part belongs to Bourns' PolySwitch RX series of resettable fuses, which are widely used for protecting low-voltage digital circuits. The series is known for its compact size and ability to replace traditional fusible resistors or standard fuses in space-constrained applications. It serves as a critical safety component in modern portable electronics.

Replacement Considerations

Direct substitutes include other Bourns parts within the same MF-RX020 family with compatible electrical ratings. Cross-brand replacements must match the hold current, trip current, and voltage specifications precisely. Verify package type and terminal configuration to ensure mechanical compatibility during installation.

FAQ

What is the difference between hold current and trip current for this device?

Hold current is the maximum current the device will allow to pass without tripping indefinitely. Trip current is the minimum current at which the device will switch to a high-resistance state within a specified time.

How does the device recover after tripping?

Once the fault condition is removed and the device cools down, it automatically returns to its low-resistance state, restoring normal circuit operation without manual intervention.