SK30-800: 30R800U Compatible Polyfuse for USB and Charging Circuits

When designing low-voltage circuits requiring higher current protection, 30R800U radial-lead resettable PPTC fuse is a common specification. Semiware's SK30-800 provides a reliable alternative with fast response and multiple package options.

What Is the SK30-800?

The SK30-800 is a polymer PTC resettable fuse with performance comparable to Littelfuse's 30R800U, designed to provide reliable overcurrent protection for low-voltage electronic circuits. It automatically limits overcurrent in the event of a fault and returns to a normal low-resistance state after the fault is cleared, eliminating the need for fuse replacement.

➡️ SK30-800 Key Electrical Parameters

➡️ SK30-800 Key Features

• Radial-lead, 30R series package – compact design suitable for through-hole PCB mounting.
• Resettable PPTC overcurrent protection – automatically limits overcurrent and restores to normal operation.
• 8 A hold current, fast time-to-trip – ensures reliable protection while minimizing impact on normal operation.
• Low-voltage applications (≤30 V) – ideal for USB devices, chargers, power adapters, and consumer electronics.
• Lead-free and halogen-free – environmentally friendly and safe for global applications.
• RoHS compliant – meets international standards for hazardous substance restrictions.

➡️ 30R Radial-lead Resettable PPTC Fuse Outline Drawing

⭐ Multiple outline drawings are provided to illustrate different lead configurations and mounting options.

➡️ SK30-800 Typical Applications

• USB devices and interfaces
• Mobile phone and tablet chargers
• Power adapters and switching power supplies
• Consumer and portable electronics

💡 Tips for Choosing PPTC Resettable Fuse Replacement

When selecting an alternative to PPTC, several factors should be carefully reviewed:

• Hold current and trip characteristics to ensure proper protection behavior
• Voltage rating compatibility for low-voltage circuits
• Radial-leaded package to match existing PCB layouts
• Time-to-trip performance for effective fault response
• Compliance requirements, such as RoHS and lead-free standards
• A suitable alternative should meet these requirements while maintaining stable and repeatable performance.

If you are designing compact circuits or upgrading overcurrent protection, Semiware provides a full range of SMD PTC fuses with stable performance and flexible supply. Detailed datasheets, cross-reference support, and technical guidance are available to help you select the right fuse for your application.

👉 Contact us to request product specifications, samples, or cross-reference recommendations.

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❓ FAQs

1.What is PPTC Thermistors?

PPTC Thermistors is resettable overcurrent protection device that increases its resistance when excessive current flows and automatically resets after the fault is removed.

2.How does it compare to traditional fuses?

Traditional fuses are single-use and must be replaced after tripping, while PPTC fuses reset automatically and require no maintenance—ideal for consumer and portable electronics.

3.How does a PPTC fuse work?

During overcurrent, the polymer material heats up and expands, sharply increasing resistance to limit current. After cooling, it returns to its low-resistance state, restoring normal operation.

4.What is the difference between PPTC and PTC?

PPTC is a polymer-based PTC device designed specifically for resettable overcurrent protection, while standard PTC components are typically used for temperature sensing or inrush current limiting.

5.What is the difference between NTC and PTC?

NTC resistance decreases as temperature rises (used for sensing and inrush limiting), while PTC resistance increases with temperature (used for protection or heating functions).