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Product Detailed Parameters
- Description：PTC RESET FUSE 9V 3A 0603
- Series：POLY-FUSE®, LoRho
- Mfr：Littelfuse Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Polymeric
- Voltage - Max：9V
- Current - Hold (Ih) (Max)：3:00 AM
- Current - Trip (It)：6:00 AM
- Current - Max：50 A
- Time to Trip：1 s
- Resistance - Initial (Ri) (Min)：3 mOhms
- Resistance - Post Trip (R1) (Max)：30 mOhms
- Resistance - 25°C (Typ)：-
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：0603 (1608 Metric), Concave
- Size / Dimension：0.063" L x 0.032" W (1.60mm x 0.80mm)
- Height - Seated (Max)：-
- Thickness (Max)：0.039" (1.00mm)
- Lead Spacing：-
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Overview
The Littelfuse 0603L300/9SLYR is a surface-mount PTC resettable fuse from the Low Rho series. It features a maximum voltage rating of 9 VDC and a hold current of 300 mA. The device trips at a minimum current of 600 mA and withstands a maximum fault current of 50 A. It offers low resistance, typically 30 mΩ, in a compact 0603 package.
Feature Summary
- Provides overcurrent protection through automatic reset functionality without manual replacement
- Utilizes polymer technology to achieve low on-resistance for minimal power loss
- Designed for surface-mount assembly with standard SMD/SMT termination style
Applications
- Portable electronic devices requiring compact circuit protection
- Data and communication equipment interfaces
- Battery-powered consumer electronics
Procurement Notes
Verify the specific voltage suffix against design requirements, as variants exist within the same series. Confirm RoHS compliance status and lead times directly with authorized distributors. Ensure storage conditions align with manufacturer guidelines to maintain performance integrity prior to assembly.
Selection Notes
Select this component when a 9 VDC maximum operating voltage is required alongside a 300 mA hold current. The low resistance characteristic makes it suitable for applications sensitive to voltage drop. Ensure the PCB footprint matches the 0603 metric dimensions for proper soldering and mechanical stability.
Part Context
This part belongs to the Littelfuse Low Rho (LORHO) series of resettable fuses. The series is characterized by ultra-low resistance values compared to standard PPTC devices. The 0603 designation indicates the physical case size, while the numerical code specifies the electrical trip characteristics.
Replacement Considerations
Direct substitutes include other 0603 LORHO series parts with matching 9V ratings, such as the 0603L150SLYR for lower current needs. Verify that alternative components meet the same 50 A maximum fault current requirement and thermal performance standards.
