MF-RX300/72-AP

Overview

The Bourns MF-RX300/72-AP is a high-density PTC resettable fuse from the Multifuse MF-RX/72 series. It features a hold current of 3.0 A and a trip current of 6.0 A, with a maximum voltage rating of 72 VDC. The device offers a maximum fault current rating of 40 A and an initial resistance of 60 mOhms. Designed for PCB mounting with radial leads spaced at 10.2 mm, it operates within a temperature range of -40°C to +85°C. The component dissipates up to 2.8 W and measures 26.7 mm in length, 20.67 mm in width, and 3.1 mm in height.

Feature Summary

• Provides automatic circuit protection through reversible polymer technology that increases resistance upon overheating.
• Engineered for high-density applications with a compact radial leaded package design.
• Capable of handling high fault currents up to 40 A while maintaining stable performance under continuous load.

Applications

• Overcurrent protection in consumer electronics such as digital cameras and portable media players
• Surge protection for telecommunications equipment including network terminals and broadband devices
• Circuit safeguarding in office automation machinery like printers and copiers

Procurement Notes

Verify the specific suffix AP against official Bourns documentation to confirm packaging specifications, as standard variants may use bulk packaging. Ensure the selected part matches the required hold current and voltage ratings for the target application circuit. Cross-reference the datasheet for precise dimensional tolerances and thermal characteristics before finalizing procurement orders.

Selection Notes

Select this component when a 3.0 A hold current and 72 VDC maximum voltage are required for overcurrent protection. Consider the 10.2 mm lead spacing for appropriate PCB layout compatibility. Evaluate the 2.8 W power dissipation capability against ambient thermal conditions to ensure reliable operation within the specified -40°C to +85°C operating temperature range.

Part Context

This part belongs to the Bourns Multifuse MF-RX/72 series of high-density PTC resettable fuses. The series is designed for surface mount and through-hole PCB applications requiring robust circuit protection. The MF-RX line provides a balance of low resistance and high fault current handling, making it suitable for space-constrained electronic designs across various industrial and consumer markets.

Replacement Considerations

Direct substitutes include other MF-RX/72 series variants with identical electrical ratings but different packaging, such as MF-RX300/72-0. Verify lead spacing and physical dimensions to ensure mechanical compatibility during replacement or upgrade processes.