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Product Detailed Parameters
- Description：PTC 9V POLYFUSE SMT 0402 .05A
- Series：POLY-FUSE®, LoRho
- Mfr：Littelfuse Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：9V
- Current - Hold (Ih) (Max)：50 mA
- Current - Trip (It)：200 mA
- Current - Max：40 A
- Time to Trip：1.5 s
- Resistance - Initial (Ri) (Min)：1.5 Ohms
- Resistance - Post Trip (R1) (Max)：20 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 0402L005KR is a Polymeric PTC Resettable Fuse from the POLY-FUSE LoRho series, designed for surface mount applications in the 0402 (1005 Metric) package. It features a hold current of 50 mA and a trip current of 100 mA, with a maximum voltage rating of 9 VDC. The device offers high resistance after tripping, with a maximum post-trip resistance of 20 Ohms. Its compact dimensions are 1.00mm x 0.50mm x 0.60mm, making it suitable for space-constrained circuit protection.
Feature Summary
- Provides resettable overcurrent protection using polymeric positive temperature coefficient technology.
- Features low initial resistance to minimize power loss in normal operation.
- Designed for automatic reset functionality without manual intervention after fault clearance.
- Constructed for surface mount assembly compatibility with standard reflow soldering processes.
Applications
- Portable electronic devices requiring compact circuit protection
- Consumer electronics with limited board space
- Battery-powered equipment needing overcurrent safeguarding
- Data line protection in small form factor systems
Procurement Notes
Verify that the ordering suffix 'KR' corresponds to the specific tape and reel packaging configuration required for automated assembly. Confirm that the 9V rating aligns with the system's maximum operating voltage. Ensure the 50mA hold current meets the application's continuous load requirements without nuisance tripping during normal operation.
Selection Notes
Select this component when space constraints necessitate a 0402 footprint. Choose based on the 50mA hold current requirement and 9V maximum voltage rating. Consider the 20 Ohm maximum post-trip resistance for voltage drop calculations. Verify thermal derating requirements if ambient temperatures exceed standard conditions.
Part Context
This part belongs to the 0402L Series of POLY-FUSE LoRho resettable fuses. The series is characterized by low resistance values and small physical dimensions. It complements Littelfuse's broader circuit protection portfolio by offering surface mount solutions for modern miniaturized electronics.
Replacement Considerations
Direct substitutes within the same series require matching the 0402 package, 50mA hold current, and 9V voltage rating. Verify that alternative parts maintain similar post-trip resistance characteristics and thermal performance specifications to ensure equivalent circuit behavior.
