MF-RX025/72-AP-17

Overview

The Bourns MF-RX025/72-AP-17 is a radial leaded PPTC resettable fuse from the Multifuse MF-RX/72 series. It features a hold current of 250 mA and a trip current of 500 mA, rated for a maximum voltage of 72 VDC. The component has a resistance of 1.95 Ohms and a power dissipation of 450 mW. Designed for PCB mounting with a 5.1 mm lead spacing, it operates within a temperature range of -40°C to +85°C. Physical dimensions include a diameter of 7.4 mm and a height of 12.7 mm.

Feature Summary

• Provides overcurrent protection through polymer positive temperature coefficient technology that automatically resets after fault clearance.
• Eliminates risks associated with traditional fuses by maintaining circuit continuity without manual replacement.
• Offers robust performance in high-voltage and high-temperature environments while reducing short-circuit hazards.

Applications

• Automotive circuit protection
• Overcurrent and surge protection for high-reliability electronic devices
• Industrial transportation systems
• Communication equipment safety systems

Procurement Notes

Verify the specific suffix AP-17 against official Bourns documentation to confirm packaging details and availability status. Ensure the selected variant matches the required reel or tape specifications for automated assembly processes. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm current production status and compliance with RoHS standards before finalizing procurement orders.

Selection Notes

Select this component when a 250 mA hold current and 72 VDC rating are required for radial leaded applications. Consider the 1.95 Ohm resistance and 450 mW power dissipation limits during thermal design. Verify that the 5.1 mm lead spacing fits the target PCB layout. Evaluate the -40°C to +85°C operating range against environmental conditions to ensure reliable tripping behavior at 500 mA.

Part Context

This device belongs to the Bourns Multifuse MF-RX/72 series, designed for wide-ranging circuit protection. The series utilizes polymeric PTC materials to provide cost-effective overcurrent protection. These components are engineered to offer flexibility in space-constrained layouts compared to traditional axial or surface mount alternatives, serving as a reliable solution for protecting sensitive electronics against fault conditions.

Replacement Considerations

Consult official substitution guides for equivalent radial leaded PPTC fuses with matching 250 mA hold current and 72 VDC ratings. Verify physical footprint compatibility, specifically the 5.1 mm lead spacing and overall dimensions. Ensure thermal characteristics and trip currents align with the original design requirements before implementing any alternative part numbers.

FAQ

What is the trip current for the MF-RX025/72-AP-17?

The trip current is specified as 500 mA, which triggers the device to increase resistance and limit current flow.

Does this component require manual replacement after a fault?

No, it is a resettable fuse that automatically returns to a low-resistance state once the fault condition is removed and the device cools down.