The **5SF1-R** is a specific type of **Microfuse (Subminiature Fuse)** characterized by its cylindrical shape and radial leads. It is primarily used for overcurrent protection in compact electronic circuits. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. General Specifications The 5SF1-R belongs to a series of quick-acting, low-breaking capacity fuses. | Feature | Specification | | :--- | :--- | | **Type** | Subminiature Radial Lead Fuse | | **Speed/Characteristic** | Quick-Acting (Fast Blow / Fast Acting) | | **Body Material** | Thermoplastic (UL 94 V-0 Flammability rated) | | **Lead Material** | Tin-plated Copper | | **Standard Compliance** | IEC 60127-3, Sheet 3 | ### 2. Electrical Characteristics The "1-R" in the part number usually refers to the **1 Ampere** current rating and the **RoHS compliance** (R). * **Rated Current ($I_n$):** 1.0 A * **Rated Voltage:** Typically 250V AC * **Interrupting Rating:** 35A or 10x rated current (whichever is greater) @ 250V AC. * **Voltage Drop:** Low internal resistance to minimize power loss in the circuit. * **Nominal Melting $I^2t$:** This value represents the energy required to melt the fuse element; for quick-acting fuses, this value is relatively low compared to time-delay fuses. ### 3. Physical Dimensions These parts are designed for through-hole mounting on Printed Circuit Boards (PCBs) where space is limited. * **Body Diameter:** ~8.5 mm * **Body Height:** ~8 mm * **Lead Pitch:** ~5.08 mm (standard spacing for radial components) --- ### 4. Key Functions and Applications The 5SF1-R acts as a "safety valve" for electronic devices. Because it is **Quick-Acting**, it is designed to open the circuit almost instantly when a current spike occurs, protecting sensitive components like ICs. **Common Applications:** * Power supplies and adapters. * Battery chargers. * Consumer electronics (TVs, Monitors). * Industrial controllers. --- ### 5. Part Number Breakdown When ordering or identifying this part, the nomenclature usually follows this logic: ```text 5SF - 1 - R | | | | | └── RoHS Compliant | └────── Rated Current (1 Ampere) └─────────── Series Name (Subminiature, Fast-acting) ``` ---