MF-SM200-2

Overview

The Bourns MF-SM200-2 is a polymer PTC resettable fuse from the Multifuse MF-SMDF series, designed for surface mount applications. It features a hold current of 2 A and a trip current of 4 A, with a maximum voltage rating of 10 VDC. The component has a maximum rated current of 40 A and an initial resistance of 30 mOhms, rising to a maximum post-trip resistance of 100 mOhms. Packaged in a 2018 (5045 metric) SMD footprint, it operates within a temperature range of -40°C to +85°C.

Feature Summary

• Provides overcurrent protection using polymer positive temperature coefficient technology.
• Offers automatic circuit restoration after fault conditions clear without manual replacement.
• Designed for compact surface mount layouts to save board space compared to radial leaded components.

Applications

• Overcurrent protection in automotive electronic circuits
• Surge protection for high-reliability electronic equipment
• Current limiting in industrial transportation systems
• Protection for communication and security system power lines

Procurement Notes

Verify the exact part number against official Bourns documentation, as the provided model may contain a typo relative to the standard MF-SMDF series nomenclature. Confirm that the suffix indicates the correct package type and electrical ratings. Ensure compliance with RoHS3 and REACH standards required for your manufacturing process. Cross-reference the datasheet for specific thermal derating curves and time-to-trip characteristics before finalizing the design.

Selection Notes

Select this component when a low-resistance, high-current surface mount resettable fuse is required for 10V DC circuits. The 2A hold current suits applications needing moderate continuous current capacity. Consider the 2018 package size for spatial constraints. Evaluate the 100mOhms max resistance to ensure minimal voltage drop impact on downstream loads during normal operation.

Part Context

This device belongs to the Bourns Multifuse MF-SMDF series, which specializes in low-ohmic surface mount PPTC fuses. The series is engineered for robust protection in harsh environments, offering higher resistance values than standard SML series parts while maintaining compact SMD form factors suitable for modern automated assembly lines.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Verify compatibility with existing designs by matching hold current, trip current, voltage rating, and package dimensions with alternative manufacturers' offerings if direct substitution is necessary.