MF-RX375-AP

Overview

The MF-RX375-AP is a PTC resettable fuse from the MF-RX/72 series by Bourns Inc. It features a hold current of 3.75 A and a maximum voltage rating of 72 VDC. The device has a trip current of 7.5 A and a maximum rated current of 40 A. Initial resistance is typically 50 mOhms, with a minimum of 30 mOhms and a maximum post-trip resistance of 80 mOhms. It operates within a temperature range of -40°C to +85°C. The component uses radial leaded mounting with a 10.2 mm lead spacing and measures 23.51 mm in length and 3.1 mm in height.

Feature Summary

• Self-resetting protection mechanism utilizing positive temperature coefficient technology
• Cured flame retardant construction for enhanced safety compliance
• Radial leaded design optimized for printed circuit board mounting

Applications

• Overcurrent protection for portable electronic devices
• Protection circuits for battery packs and power supplies
• Surge protection in communication equipment interfaces

Procurement Notes

Verify that the suffix AP corresponds to the specific tape-and-reel packaging configuration required for automated assembly processes. Confirm that the 72V rating aligns with the system's maximum operating voltage to ensure adequate safety margins during fault conditions. Cross-reference the lead spacing tolerance of 10.2 mm with PCB footprint specifications to guarantee mechanical fitment.

Selection Notes

Select this component when a self-resetting overcurrent protector is required for circuits operating up to 72VDC. The 3.75A hold current makes it suitable for moderate load applications where space constraints favor radial leads. Ensure the ambient temperature does not exceed 85°C to maintain reliable tripping characteristics. Compare initial resistance values against voltage drop requirements in the signal path.

Part Context

This part belongs to the MF-RX series of multifuse products designed for compact electronics. The series offers various current ratings and voltage options to accommodate different circuit protection needs. The MF-RX375 variant specifically targets applications requiring higher current handling capabilities within a small form factor, balancing protection performance with physical size constraints.

Replacement Considerations

MF-RX375/72-0

FAQ

What is the significance of the AP suffix in the part number?

The AP suffix indicates the specific packaging format, typically tape and reel, which facilitates automated surface-mount or insertion machine processing.

How does the post-trip resistance affect circuit operation after a fault?

The post-trip resistance (max 80 mOhms) determines the voltage drop across the device during a fault state, influencing the amount of current that continues to flow to protected components.