0805L300SLWR

Overview

The Littelfuse 0805L300SLWR is a polymer PTC self-recovery fuse from the POLY-FUSE LoRho series, designed for surface-mount applications in the 0805 (2012 metric) package. It features a maximum voltage rating of 6V and a hold current (Ih) of 3A. The device trips at a current of 6A and has a maximum interrupting rating of 50A. Initial resistance is typically 3 mOhms, rising to a maximum of 30 mOhms after tripping. It operates within a temperature range of -40°C to 85°C and holds cURus and TUV certifications.

Feature Summary

• Polymer positive temperature coefficient technology enables automatic circuit recovery after fault clearance without manual replacement.
• Low resistance design minimizes power loss and heat generation during normal operation compared to standard PPTC devices.
• Compact 0805 surface-mount footprint allows for high-density PCB layouts in space-constrained electronic designs.

Applications

• Overcurrent protection for portable consumer electronics and handheld devices
• Protection of data ports and communication interfaces in mobile equipment
• Circuit safeguarding in battery-powered systems and USB peripherals

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to ensure correct packaging and tolerance specifications. Confirm RoHS 3 compliance status for your region's regulatory requirements. Check lead times and availability directly with authorized distributors as supply chain conditions vary. Ensure the selected variant matches the required hold current and voltage ratings for the target application circuit.

Selection Notes

Select this component when low initial resistance is critical to maintain signal integrity or reduce voltage drop in low-voltage circuits. The 0805 package size is suitable for automated surface-mount assembly processes. Consider the trip current margin relative to the peak operating current to prevent nuisance tripping. Verify that the maximum operating voltage of 6V aligns with the system's nominal and surge voltage levels.

Part Context

This part belongs to Littelfuse's POLY-FUSE LoRho series, which specializes in low-resistance polymeric resettable fuses. The series is engineered for applications requiring minimal impact on circuit performance during normal operation. The 0805L300SLWR specifically targets markets demanding compact, reliable overcurrent protection with fast response characteristics in small form factors.

Replacement Considerations

Consult the official Littelfuse substitution guide for verified equivalents. Cross-reference hold current, voltage rating, and physical dimensions before replacing. Ensure any substitute part maintains compatible certification approvals for the end product.

FAQ

What is the difference between hold current and trip current for this fuse?

The hold current (3A) is the maximum current the device can sustain indefinitely without tripping. The trip current (6A) is the minimum current at which the device will switch to a high-resistance state within a specified time.

Does the 0805L300SLWR require manual resetting after a fault?

No, it is a self-recovery fuse. Once the fault condition is removed and the device cools down, it automatically returns to its low-resistance state.