0805L300SLTHYR

Overview

The Littelfuse 0805L300SLTHYR is a PolySwitch polymer PTC resettable fuse designed for surface mount applications in the 0805 (2012 metric) concave package. It features a maximum operating voltage of 6V and a hold current (Ih) of 3A. The device trips at 6A within 5 seconds and withstands a maximum surge current of 50A. Initial resistance is typically 3 mOhms, rising to a maximum of 30 mOhms after tripping. It operates between -40°C and 85°C and holds cURus and TUV certifications.

Feature Summary

• Polymer PTC technology provides automatic reset functionality after fault clearance
• Low resistance design minimizes power loss during normal operation
• Compact 0805 surface mount footprint suitable for space-constrained PCB layouts
• Concave package profile aids in mechanical stability during reflow soldering

Applications

• Overcurrent protection for portable electronic devices
• Circuit protection in medical infusion pumps and wearable injectors
• Protection for USB ports and data lines in consumer electronics
• Battery pack protection in mobile communication equipment

Procurement Notes

Verify the specific ordering suffix 'HYR' against the manufacturer's latest datasheet to confirm packaging details and material composition. Ensure that the 6V rating aligns with the target circuit's maximum operating voltage. Cross-reference the RoHS 3 compliance status with current regulatory requirements for the destination market. Confirm that the 0805 concave package dimensions fit within the designated PCB land pattern without interference from adjacent components.

Selection Notes

Select this component when low initial resistance is critical for maintaining signal integrity or efficiency in low-voltage circuits. The 3A hold current and 6A trip current provide a defined margin for transient loads while ensuring protection against sustained overcurrents. The 50A maximum surge rating allows the device to handle momentary inrush currents common in capacitive loads. Verify that the ambient temperature range of -40°C to 85°C covers the operational environment of the end application.

Part Context

This part belongs to the POLY-FUSE LoRho series, which specializes in low-resistance SMD PPTCs. The 0805L series offers a balance of compact size and high current handling capabilities compared to smaller packages. It serves as a reusable alternative to traditional fuses in applications where maintenance access is limited or frequent replacement is impractical.

Replacement Considerations

Direct substitute: 0805L300SLWR. Both parts share identical electrical ratings and package type; verify if the 'HYR' suffix denotes a specific tape-and-reel packaging variation or material update compared to the standard 'WR' suffix.