MF-SMHT300-2

Overview

The Bourns MF-SMHT300-2 is a high-temperature polymer positive temperature coefficient (PPTC) resettable fuse from the Multifuse series. It features a surface-mount 1812 package with radial leaded-style mounting characteristics for PCB integration. The component provides overcurrent protection with a hold current of 3.0 A and a trip current of 6.0 A. It operates within a maximum voltage of 16 VDC and withstands fault currents up to 100 A. The device exhibits a minimum resistance of 79 mΩ and functions reliably across an operating temperature range of -40°C to +125°C, meeting AEC-Q200 automotive qualification standards.

Feature Summary

• Complies with AEC-Q200 stress test requirements for automotive passive components
• Maintains low thermal decay coefficient for stable performance under varying temperatures
• Delivers high power ratings and increased hold current capacity at elevated temperatures

Applications

• Protection of various automotive circuits
• Surge and overcurrent protection for electronic equipment operating at high temperatures
• Resettable fault protection for general-purpose electronics
• Communication and safety systems requiring robust circuit defense

Procurement Notes

Verify the specific ordering suffix and packaging configuration against the official Bourns datasheet before procurement. Confirm that the selected variant matches the required surface-mount footprint and terminal type for your PCB layout. Ensure compliance with RoHS directives and AEC-Q200 automotive qualification standards if the application demands these certifications. Cross-reference the manufacturer part number with authorized distributors to guarantee authenticity and traceability.

Selection Notes

Select this component when circuit design requires overcurrent protection in environments exceeding standard temperature limits. The 3.0 A hold current suits applications needing moderate continuous current handling with rapid response to faults. Consider the 16 VDC rating for low-voltage DC bus protection. The AEC-Q200 certification makes it suitable for automotive-grade designs where reliability under thermal stress is critical compared to standard commercial-grade PPTC devices.

Part Context

This part belongs to the MF-SMHT series of high-temperature PPTC resettable fuses by Bourns. The series expands the Multifuse product line, offering polymer-based protection specifically engineered for harsh conditions. These components provide cost-effective fault protection while eliminating tripping issues caused by ambient temperature fluctuations, serving as a compact alternative to traditional fuses in space-constrained layouts.

Replacement Considerations

Consult the official Multifuse PPTC Resettable Fuses Cross Reference Guide for verified substitute part numbers. Do not assume functional equivalence based solely on electrical parameters; verify package dimensions and thermal characteristics.