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Product Detailed Parameters
- Description：PTC RESET FUSE 6V 200MA 0402
- Series：POLY-FUSE®, LoRho
- Mfr：Littelfuse Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：6V
- Current - Hold (Ih) (Max)：200 mA
- Current - Trip (It)：500 mA
- Current - Max：40 A
- Time to Trip：1 s
- Resistance - Initial (Ri) (Min)：100 mOhms
- Resistance - Post Trip (R1) (Max)：1.25 Ohms
- 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 0402L020SLKR is a polymeric PTC self-resetting fuse designed for surface mount applications in the 0402 (1005 metric) concave package. It features a maximum operating voltage of 6V and a hold current (Ih) of 200 mA. The device trips at a minimum current of 400 mA, with a maximum trip time of 2 seconds. Initial resistance is typically 3.5 Ohms, rising to a maximum of 8.0 Ohms after tripping. It operates within a temperature range of -40°C to +85°C and supports a maximum fault current of 40 A.
Feature Summary
- Provides overcurrent protection through automatic reset functionality upon cooling
- Compact surface mount footprint suitable for space-constrained designs
- Certified by UL and TUV for safety compliance
Applications
- USB 3.0 and USB 2.0 port protection
- Li-ion and Li-Polymer battery pack circuits
- Smartphone and tablet peripheral protection
Procurement Notes
Verify component authenticity using manufacturer serial codes or holographic labels. Confirm RoHS compliance status and specific tape-and-reel packaging specifications prior to integration. Ensure storage conditions maintain humidity levels below specified thresholds to preserve adhesive integrity and electrical performance characteristics.
Selection Notes
Select this component when circuit design requires a low-voltage, high-current resettable fuse in an ultra-compact form factor. Evaluate the hold current against normal operating loads to prevent nuisance tripping. Consider the trip current margin relative to transient surge capabilities of the protected load to ensure reliable fault detection without compromising operational stability.
Part Context
This part belongs to the Littelfuse LoRho series, engineered for minimal profile requirements. The 0402L variant specifically targets portable electronics where board real estate is limited. It serves as a critical protection element in consumer devices requiring robust yet small-scale overcurrent safeguarding mechanisms.
Replacement Considerations
Direct substitutes include other 0402L series variants with adjusted current ratings such as 0402L035SLKR or 0402L050SLKR. Cross-reference package dimensions and electrical parameters to ensure compatibility with existing PCB footprints and circuit requirements.
