MICROSMD500LR-2

Overview

The Littelfuse MICROSMD500LR-2 is a surface-mount polymeric positive temperature coefficient (PPTC) resettable fuse belonging to the miniASMD series. Designed for low-voltage circuit protection, this component utilizes a polymer composite that increases resistance significantly upon overheating caused by overcurrent conditions. The device automatically resets to its original low-resistance state once the fault condition is removed and the unit cools down. It features a compact 1206 package footprint suitable for dense PCB layouts.

Feature Summary

• Provides automatic circuit protection against overcurrent and excessive heat
• Self-resetting functionality eliminates the need for manual replacement after fault clearance
• Compact surface-mount design facilitates integration into space-constrained electronic assemblies

Applications

• Portable consumer electronics
• Laptop and tablet battery packs
• Peripheral interface circuits

Procurement Notes

Verify the specific Littelfuse datasheet for the MICROSMD500LR-2 to confirm critical electrical ratings such as hold current, trip current, and maximum voltage before finalizing procurement. Ensure compatibility with the target application's thermal environment and fault current requirements. Cross-reference the manufacturer's official documentation to validate RoHS compliance status and recommended soldering profiles for reliable assembly.

Selection Notes

Select this component based on the required hold current and maximum operating voltage of the protected circuit. Consider the physical size constraints of the printed circuit board layout when choosing between different package sizes within the same series. Evaluate the thermal dissipation characteristics of the surrounding components to ensure proper tripping behavior under continuous load conditions.

Part Context

This part belongs to the miniASMD family of resettable fuses manufactured by Littelfuse. These devices are engineered specifically for applications requiring robust protection in small form factors. The series offers various current ratings to accommodate different circuit demands while maintaining consistent performance characteristics across the product line.

Replacement Considerations

Direct substitutes may include other PPTC resettable fuses from Littelfuse or alternative manufacturers with matching 1206 footprints and equivalent electrical specifications. Verify that any replacement part meets the same voltage and current ratings to ensure adequate circuit protection.