MF-RX050/72-2

Overview

The Bourns MF-RX050/72-2 is a polymeric positive temperature coefficient (PPTC) resettable fuse from the Multifuse MF-RX/72 series. Designed for radial leaded through-hole PCB mounting, this component provides overcurrent protection with a maximum voltage rating of 72 VDC. It features a hold current of 500 mA and a trip current of 1 A. The device exhibits a maximum resistance of 0.6 Ohms and operates within a temperature range of -40°C to +85°C. Physical dimensions include a diameter of 7.4 mm and a height of 13.4 mm, with a lead spacing of 5.1 mm.

Feature Summary

• Utilizes polymer PTC technology for automatic circuit recovery after fault clearance
• Provides dual UL and CSA certifications for international compliance
• Offers compact radial leaded package suitable for dense PCB layouts
• Ensures consistent thermal performance across wide operating temperatures

Applications

• Overcurrent protection in portable electronic devices
• Protection circuits for battery packs and power supplies
• Signal line protection in telecommunications equipment
• Automotive electronics requiring UL recognized components

Procurement Notes

Verify that the ordering suffix matches the required packaging configuration, as standard variants may differ from tape-and-reel or ammo pack options. Confirm RoHS compliance status and specific certification marks (UL/cUL) required for your target market. Ensure the radial lead spacing aligns with your PCB footprint design before finalizing procurement orders.

Selection Notes

Select this component when a 72VDC maximum voltage rating and 500mA hold current are required for radial mounting applications. Compare against higher current variants in the MF-RX/72 series if system loads exceed 500mA. Consider the 0.6 Ohm maximum resistance impact on low-voltage signal lines. Verify that the 85°C maximum operating temperature meets environmental requirements.

Part Context

This part belongs to the Bourns Multifuse MF-RX/72 series of resettable fuses. The series offers various hold currents ranging from low milliampere values to several amperes, all sharing the same 72VDC voltage rating and radial leaded form factor. This specific model represents the 500mA hold current variant within that standardized product family.

Replacement Considerations

Direct substitutes within the same series include MF-RX040/72-2 for lower current needs or MF-RX060/72-2 for higher capacity. Cross-series replacements require matching voltage ratings and physical package dimensions. Verify that alternative PTC devices meet the same UL recognition standards and thermal characteristics.