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Product Detailed Parameters
- Description：PTC RESET FUSE 6V 500MA 0402
- Series：POLY-FUSE®, LoRho
- Mfr：Littelfuse Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：6V
- Current - Hold (Ih) (Max)：500 mA
- Current - Trip (It)：1:00 AM
- Current - Max：50 A
- Time to Trip：100 ms
- Resistance - Initial (Ri) (Min)：40 mOhms
- Resistance - Post Trip (R1) (Max)：400 mOhms
- Resistance - 25°C (Typ)：-
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：0402 (1005 Metric), Concave
- Size / Dimension：0.039" L x 0.020" W (1.00mm x 0.50mm)
- Height - Seated (Max)：-
- Thickness (Max)：0.024" (0.60mm)
- Lead Spacing：-
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Overview
The Littelfuse 0402L050SLKR is a polymer PTC self-resetting fuse from the LoRho series, designed for surface mount applications in the 0402 (1005 metric) package. It features a maximum holding current of 500 mA and a trip current of 1 A. The device supports a maximum voltage of 6 VDC with a high fault current rating of 50 A. Initial resistance is typically 40 mOhms minimum, rising to a maximum of 400 mOhms after tripping. It operates within a temperature range of -40°C to 85°C and includes certifications such as cURus and TUV.
Feature Summary
- Utilizes polymer PTC technology for automatic circuit reset after overcurrent events
- Low resistance design minimizes power loss during normal operation
- Compact 0402 footprint enables dense PCB layouts
- RoHS compliant construction suitable for modern manufacturing processes
Applications
- Portable electronic devices requiring compact overcurrent protection
- Battery-powered circuits needing resettable safety mechanisms
- Data line protection in consumer electronics
- Automotive infotainment systems meeting AEC-Q200 standards
Procurement Notes
Verify the specific suffix 'KR' against official Littelfuse documentation to confirm packaging type and availability status. Cross-reference the part number with current datasheets to ensure compliance with RoHS3 specifications. Confirm that the 0402 package dimensions match your PCB footprint requirements. Check for any recent product change notices regarding material or performance updates.
Selection Notes
Select this component when space constraints require a 0402 SMD form factor. Ensure the circuit's normal operating current remains below the 500 mA holding current threshold. Verify that the system voltage does not exceed the 6 VDC rating. Consider the thermal environment, as the device is rated for -40°C to 85°C. Compare initial resistance values if low voltage drop is critical for the application.
Part Context
This part belongs to the Littelfuse POLY-FUSE LoRho series, which specializes in low-resistance surface mount PTCs. The series is engineered for high-current density applications where minimal impedance is required. The 0402 size represents one of the smallest available packages in this family, targeting ultra-compact portable electronics and advanced automotive modules.
Replacement Considerations
The 0402L050SLYR is listed as a discontinued direct replacement option. Verify electrical compatibility before substitution. Other LoRho series parts with similar current ratings may serve as alternatives if package or parameter differences are acceptable.
