Understanding SMD2920P185TF: A 2920 SMD Resettable PTC Fuse Explained

🚀 As smart electronic products become increasingly feature-rich, the requirements for circuit design in terms of safety and stability are also constantly rising. Overcurrent, short circuits, or abnormal loads frequently occur in USB interfaces, power banks, smart handheld terminals, and various consumer electronics devices. Insufficient protection measures can easily damage critical components such as ICs and power management modules, affecting product reliability and lifespan.

Therefore, overcurrent protection devices have become an indispensable component in power supply and interface circuits. Among them, self-resetting fuses are widely used in modern electronic products due to their characteristics of requiring no replacement and being reusable.

➡️ What is a SMD2920P185TF?

SMD2920P185TF is a PTC self-resetting fuse in a 2920 package, optimized for medium-to-high current applications. It quickly enters a protective state when overcurrent occurs and automatically recovers after the fault is cleared, effectively balancing circuit safety and system availability.

➡️ SMD2920P185TF Key Electrical Parameters

➡️ SMD2920P185TF Working Principle

As a resettable PTC fuse, the SMD2920P185TF increases its resistance rapidly when an overcurrent condition occurs, limiting the current and protecting downstream circuits. Once the fault is removed, the device automatically returns to a low-resistance state and resumes normal operation.

This self-resetting behavior improves system reliability while reducing maintenance and replacement costs compared with traditional fuses.

⚙️ SMD2920P185TF Typical Applications

1️⃣ USB Interface and Data Port Protection

• USB Hub
• USB Charging Port
• PC Peripherals, Smart Terminal Interface Board

2️⃣ Consumer Electronics

• Smart Speakers
• Routers, Set-Top Boxes
• Wearable Device Charging Modules

3️⃣ Batteries and Battery Protection Circuits

• Battery Protection Boards (PCM/BMS)
• Charge/Discharge Management Modules
• Portable Energy Storage Devices

4️⃣ Power Adapters and Charging Devices

• USB Chargers
• Power Banks
• Low-Power AC/DC or DC/DC Modules

5️⃣ Industrial and Communication Equipment (Low-Power Components)

• Industrial Control Boards
• Communication Interface Modules
• Sensor Power Supply Circuits

6️⃣ Smart Home and IoT Devices

• Smart Sockets
• Smart Door Locks
• Home Automation Control Modules

💎 Why Choose Semiware's PTC Fuse Solutions?

• Semiware is a professional manufacturer of self-resetting PTC fuses, offering a full range of SMD packaged products, including 2920, 1206, 1812, and 0603. Widely used in consumer electronics, power supply, and industrial applications, these fuses are designed to provide reliable overcurrent protection.
• With stable volume production and rigorous quality control, Semiware provides customers with samples, detailed datasheets, and technical support throughout the design and procurement stages. We also offer cross-reference advice to help customers quickly find suitable alternatives.
• All Semiware PTC fuses comply with RoHS and REACH standards, ensuring compliance with global regulations and guaranteeing long-term stable supply.

If you are developing new products or upgrading existing protection designs, we offer a full range of SMD2920 PPTC fuses. They are of stable quality, have flexible delivery times, and come with technical support.

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

📩 sales29@semiware.com

❓ FAQs

1.What is a PPTC fuse?

A PPTC fuse is a 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).