0603L050YR

Overview

The Littelfuse 0603L050YR is a surface-mount polymer PTC resettable fuse from the POLY-FUSE 0603L series. It provides overcurrent protection with a maximum voltage rating of 6 VDC and a hold current of 500 mA. The device trips at 1 A and supports a maximum fault current of 40 A. Initial resistance is typically 100 mOhms, rising to a maximum of 680 mOhms after tripping. It operates within a temperature range of -40°C to +85°C and features a compact 0603 (1.60mm x 0.80mm) footprint.

Feature Summary

• Automatic resettable protection utilizing polymer positive temperature coefficient technology
• Compact surface-mount design suitable for space-constrained PCB layouts
• High fault current handling capability up to 40 A
• Compatible with standard reflow soldering processes

Applications

• Overcurrent protection for portable electronic devices
• Circuit protection in consumer electronics
• Protection for peripheral interfaces and data lines
• Battery pack circuit safeguarding

Procurement Notes

Verify component authenticity through authorized Littelfuse distributors or certified suppliers. Confirm RoHS 3 compliance status and check for recent PCN updates regarding material or manufacturing changes. Ensure storage conditions maintain moisture sensitivity level 1 integrity prior to assembly.

Selection Notes

Select this component when a 6 VDC system requires a 500 mA hold current with a 0603 form factor. Consider the 1 A trip threshold and 680 mOhms maximum post-trip resistance for thermal management. Evaluate the 40 A fault rating against potential short-circuit scenarios to ensure adequate safety margins.

Part Context

This part belongs to the POLY-FUSE 0603L series, designed for general-purpose circuit protection. It serves as a solid-state alternative to traditional fuses, offering repeated use after fault clearance. The series is widely utilized in automotive, telecom, and power supply applications requiring reliable overcurrent interruption.

Replacement Considerations

SMD0603B050TF by YAGEO is listed as a parameter-equivalent alternative. Verify that substitute components match the 6 VDC rating, 500 mA hold current, and 0603 package dimensions before integration.