MF-R185-0-17

Overview

The Bourns MF-R185-0-17 is a PTC self-resetting fuse from the Multifuse MF-R series, designed for overcurrent protection in electronic circuits. It features a hold current of 1.85A and a trip current of 3.7A at ambient temperature. Rated for a maximum DC voltage of 30V, it handles a maximum fault current of 40A with a maximum power dissipation of 1W. The component operates within a temperature range of -40°C to +85°C and exhibits an initial resistance minimum of 40mΩ and a post-trip resistance maximum of 110mΩ. It utilizes a radial leaded package with a 5.1mm pitch.

Feature Summary

• Provides automatic circuit recovery after fault clearance without manual replacement
• Offers dual-mode protection against both overcurrent and excessive temperature conditions
• Ensures low initial resistance to minimize normal operating voltage drop
• Maintains stable electrical characteristics across a wide industrial temperature range

Applications

• Overcurrent protection for portable electronic devices
• Circuit safeguarding in telecommunications equipment
• Protection for peripheral interfaces such as USB ports
• Surge and overload defense in consumer electronics

Procurement Notes

Verify the specific suffix code matches the required lead configuration and packaging format. Confirm that the thermal environment does not exceed the rated operating temperature limits. Ensure the holding current rating accounts for derating factors at elevated ambient temperatures. Validate compliance with relevant safety standards for the target application region before finalizing procurement.

Selection Notes

Select this component when a resettable protection device is preferred over fusible links to reduce maintenance costs. Choose based on the specific hold and trip current requirements relative to the circuit's normal operating load. Consider the physical dimensions and lead spacing for PCB layout compatibility. Evaluate the maximum fault current capability to ensure the device can withstand potential surge events without damage.

Part Context

This part belongs to the Multifuse MF-R series by Bourns Inc., a line of polymer positive temperature coefficient devices. These components are engineered for compact circuit protection solutions where space is limited. The series is widely utilized in industries requiring reliable, reusable overcurrent safeguards for sensitive electronic assemblies.

Replacement Considerations

Direct substitutes must match the 1.85A hold current and 30V rating. Verify equivalent trip characteristics and physical footprint compatibility. Cross-reference with other manufacturers' PTC fuses having identical thermal and electrical profiles.