MF-RX110-2-99

Overview

The Bourns MF-RX110-2-99 is a surface-mount polymer positive temperature coefficient (PPTC) resettable fuse from the Multifuse RX series. It provides overcurrent protection with a hold current of 1.1 A and a trip current of 2.2 A at ambient temperatures. The device supports a maximum voltage of 6 VDC and can withstand fault currents up to 40 A. It features a low initial resistance of 210 mΩ and operates within a temperature range of -40°C to +85°C. The component is housed in a compact 1210 (3225 metric) SMD package, designed for efficient board space utilization while ensuring reliable circuit protection against short circuits and thermal runaway.

Feature Summary

• Polymer PTC technology enables automatic circuit restoration after fault conditions clear
• Compact surface-mount design facilitates automated assembly and space-constrained layouts
• High fault current capability ensures robust protection against severe short circuits
• Low on-resistance minimizes power loss and heat generation during normal operation

Applications

• Overcurrent protection for portable electronic devices
• Circuit safeguarding in consumer audio and video equipment
• Protection for battery-powered mobile accessories
• Surge protection in communication port interfaces

Procurement Notes

Verify that the specific suffix '-99' aligns with the required packaging configuration, such as tape and reel specifications, as indicated by manufacturer documentation. Confirm RoHS compliance status and ensure the selected variant matches the intended reflow soldering profile requirements for the production line. Cross-reference the datasheet for any updates on material declarations or certification validity prior to final procurement authorization.

Selection Notes

Select this component when the application requires a low-voltage, high-current resettable fuse with a small footprint. Ensure the operating environment stays within the specified -40°C to +85°C range to maintain performance integrity. Evaluate the circuit's normal operating current against the 1.1 A hold current to prevent nuisance tripping. Consider the 6 VDC maximum voltage rating to ensure compatibility with the system's supply rails and transient voltage levels.

Part Context

This part belongs to the Multifuse RX series, which focuses on high-reliability protection for applications requiring rapid response and compact sizing. The series is engineered for environments where traditional fuses are impractical due to size constraints or the need for reusable protection. It complements Bourns' broader portfolio of thermal protection devices, offering a balance between cost-effectiveness and durable circuit safeguarding for mass-produced electronics.

Replacement Considerations

Direct substitutes must match the 1.1 A hold current, 6 VDC rating, and 1210 package dimensions. Verify that alternative PPTC devices offer comparable trip characteristics and fault current handling capabilities. Ensure any replacement maintains the same thermal performance and mounting style to avoid redesigning the PCB layout or altering the assembly process.