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Product Detailed Parameters
- Description：PTC RESET FUSE 4.0A 6V 0805
- Series：POLY-FUSE®, LoRho
- Mfr：Littelfuse Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：6V
- Current - Hold (Ih) (Max)：4:00 AM
- Current - Trip (It)：9:00 AM
- Current - Max：50 A
- Time to Trip：2 s
- Resistance - Initial (Ri) (Min)：3 mOhms
- Resistance - Post Trip (R1) (Max)：18 mOhms
- 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)：0.055" (1.40mm)
- Lead Spacing：-
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Overview
The Littelfuse 0805L400SLWR is a surface-mount polymer PTC self-resetting fuse from the Low Rho series. It features a hold current of 4 A, trip current of 9 A, and maximum voltage of 6 VDC. The device offers a maximum rated current of 50 A and an initial resistance of 18 mOhms. Operating within a temperature range of -40°C to +85°C, it utilizes a 0805 (2012 metric) package.
Feature Summary
- Self-resetting protection mechanism utilizing polymer PTC technology for automatic circuit recovery after fault clearance.
- Low resistance design characteristic of the Low Rho series, minimizing power loss during normal operation.
- Surface mount construction compatible with standard SMD/SMT assembly processes.
Applications
- Overcurrent protection in portable electronic devices
- Circuit safeguarding in battery-powered equipment
- Protection for communication interfaces and data lines
Procurement Notes
Verify component authenticity through authorized Littelfuse distributors or certified supply chain partners. Confirm RoHS compliance status and specific packaging options such as cut tape or reel availability directly with the supplier. Ensure storage conditions adhere to manufacturer guidelines to maintain material integrity prior to assembly.
Selection Notes
Select this component based on the required 4 A hold current and 6 VDC maximum voltage rating. Evaluate the low initial resistance of 18 mOhms for efficiency requirements. Consider the 0805 footprint constraints and operating temperature range of -40°C to +85°C for environmental compatibility.
Part Context
This part belongs to the POLY-FUSE LoRho series, designed for low-resistance applications. It serves as a reusable alternative to traditional fuses, providing overcurrent protection in compact surface-mount formats suitable for modern electronics manufacturing.
Replacement Considerations
Consult official Littelfuse documentation for verified substitute part numbers within the same series or family that match electrical specifications and physical dimensions.
