The **5SFP100-R** is a high-performance **Fast-Acting Surface Mount Fuse** (SMD) manufactured by Bel Fuse Inc. It is specifically designed for overcurrent protection in compact electronic circuits. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Bel Fuse Inc. | | **Current Rating** | 100mA (0.1A) | | **Voltage Rating (AC)** | 125 V | | **Voltage Rating (DC)** | 125 V | | **Fuse Type** | Fast-Acting / Quick-Acting | | **Package / Case** | 2410 (6125 Metric) | | **Breaking Capacity** | 50A @ 125VAC/DC | | **Melting I²t** | 0.0016 A²s | | **Resistance (Cold)** | ~4.10 Ohms | --- ### 2. Functional Characteristics #### A. Fast-Acting Response The "Fast-Acting" designation means this fuse is designed to open very quickly (typically within milliseconds) when an overcurrent condition occurs. This protects sensitive semiconductor components (like ICs or MOSFETs) that cannot withstand even brief surges. #### B. Brick Enclosure The 5SFP series uses a square ceramic body (Brick) design. This construction provides: * Excellent mechanical strength. * Better thermal stability compared to glass or thin-film fuses. * Resistance to vibration and harsh environments. #### C. Surface Mount Technology (SMT) The 2410 footprint allows for automated pick-and-place assembly on Printed Circuit Boards (PCBs), saving space compared to traditional leaded glass fuses. --- ### 3. Common Applications Due to its low current rating (100mA) and fast response time, it is commonly used in: * **LCD Monitors & Backlight Inverters:** Protecting high-voltage driver circuits. * **Power Supplies:** Secondary side protection for low-power rails. * **Telecommunications:** Protection for line cards and networking equipment. * **Industrial Controllers:** Safeguarding delicate sensor inputs and microcontrollers. --- ### 4. Part Number Breakdown (5SFP Series) * **5SFP:** Series name (Square Ceramic Surface Mount, Fast-Acting). * **100:** Rated current (100mA). * **-R:** RoHS Compliant (Lead-free). ---