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Product Detailed Parameters
- Description：POLYSWITCH RESETTABLE PPTC
- Series：POLY-FUSE®, 0805L
- Mfr：Littelfuse Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：24V
- Current - Hold (Ih) (Max)：200 mA
- Current - Trip (It)：500 mA
- Current - Max：100 A
- Time to Trip：500 ms
- Resistance - Initial (Ri) (Min)：500 mOhms
- Resistance - Post Trip (R1) (Max)：3.5 Ohms
- Resistance - 25°C (Typ)：-
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：0805 (2012 Metric), Concave
- Size / Dimension：0.083" L x 0.053" W (2.10mm x 1.35mm)
- Height - Seated (Max)：-
- Thickness (Max)：0.030" (0.75mm)
- Lead Spacing：-
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Overview
The Littelfuse Inc. 0805L020/24YR is a surface-mount PolySwitch resettable PTC device designed for circuit protection. It features a hold current of 200 mA and a trip current of 500 mA, with a maximum voltage rating of 60 V. The component has an initial resistance of 1.0 Ohm maximum and a post-trip resistance of 3.5 Ohms maximum. It operates within a temperature range of -40°C to 85°C and is housed in an 0805 (2012 Metric) package.
Feature Summary
- Provides reliable overcurrent protection by increasing resistance during fault conditions
- Automotive-grade qualification ensures reliability in harsh environments
- Surface-mount design facilitates automated assembly on printed circuit boards
Applications
- Protection of automotive electronic circuits and wiring harnesses
- Overcurrent safeguarding for portable consumer electronics
- Circuit protection in telecommunications equipment
Procurement Notes
Verify the specific suffix '24YR' against official manufacturer documentation to confirm tape-and-reel packaging specifications and moisture sensitivity level. Ensure the selected variant matches the required lead-free compliance standards for your manufacturing process. Cross-reference the AEC-Q200 certification status if automotive application validation is required.
Selection Notes
Select this component based on the 200 mA hold current requirement for the protected circuit. Confirm that the 60 V maximum voltage rating exceeds the system's operating voltage. Evaluate the thermal environment to ensure the 85°C maximum operating temperature is sufficient for the installation location.
Part Context
This part belongs to the 0805L series of PolySwitch resettable fuses from Littelfuse. These devices are polymer PTCs designed to replace traditional fuses in applications requiring automatic recovery after fault clearance. The series offers various current ratings in a compact surface-mount footprint.
Replacement Considerations
Direct substitutes include the Bel Fuse Inc. 0ZCK0020FF2G and Bourns Inc. MF-PSMF020X-2. Verify electrical parameters such as hold current, trip current, and voltage rating before substitution.
