🔎 SK30-900: A Reliable 30R900U Equivalent
The SK30-900 is a polymer PTC resettable fuse with performance comparable to Littelfuse's 30R185U, 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.Perfect for engineers and procurement teams looking for 30R series compatible PTC protection.
➡️ SK30-900 Key Electrical Parameters
| Parameter | Value |
| Part Number | SK30-900 |
| Package | SK30/30R |
| IHOLD (Max) (A) | 9.0 |
| ITRIP (Min) (A) | 18 |
| VMAX (V) | 30 |
| IMAX (A) | 40 |
| Time to Trip Current (A) | 40 |
| Time to Trip Time (s) | 20 |
| RMIN (Ω) | 0.005 |
| RMAX (Ω) | 0.02 |
➡️ SK30-900 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.
- 9.0 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.
❓ Why Can Semiware’s SK30-900 Be an Alternative to the 30R900U?
For purchasing and engineering professionals, Semiware's SK30-900 offers the following advantages: 👇
- Stable and reliable performance
- Manufactured in our own factory, allowing us to offer customers highly competitive pricing.
- Compatible with common 30R series resettable fuses
- Reliable supply and technical support
- Reduces certification risks associated with alternative components
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.
❓ 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).
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