MF-RX018/250U-2

Overview

The MF-RX018/250U-2 is a polymeric PTC resettable fuse manufactured by Bourns Inc. It features a maximum voltage rating of 60V DC, with an internal rating of 250V. The hold current (Ih) is specified at 180 mA, while the trip current (It) is 500 mA. The device utilizes a radial through-hole package in a disc form factor. Minimum resistance is 0.8 ohms and maximum resistance is 4 ohms. Operating temperature range spans from -40°C to +85°C.

Feature Summary

• Polymeric construction for resettable overcurrent protection
• Radial leaded disc package for through-hole mounting
• Capable of withstanding impulse and AC tests when used in specific circuit designs

Applications

• Telecommunications line protection circuits
• User interface circuit overcurrent safeguarding
• Intra-building equipment pulse protection systems

Procurement Notes

Verify the exact suffix designation during procurement, as variations such as U-0 or standard versions may exist within the same series. Confirm that the selected component matches the required radial disc package and voltage ratings for the target application. Ensure compatibility with existing PCB footprints and thermal management requirements before finalizing orders.

Selection Notes

Select this component when a resettable fuse with a 180 mA hold current and 60V rating is required. Consider its ability to withstand specific impulse currents when paired with other protective devices like gas discharge tubes. Evaluate the thermal environment to ensure operation remains within the -40°C to +85°C range for reliable performance.

Part Context

This part belongs to Bourns' Multifuse resettable fuse family, designed for electronic circuit protection. It serves as a self-resetting alternative to traditional fuses, offering repeated protection cycles after fault clearance. The product is commonly integrated into telecommunications and industrial control systems requiring robust overcurrent defense.

Replacement Considerations

Public confirmed substitutes include the MF-RX018/250-2 and MF-RX018/250U-0. These variants share similar electrical characteristics and package types. Verify specific suffix differences regarding coating or packaging before substitution.