Based on the part number provided, **543-R** typically refers to a specific type of **Fuse Holder** (specifically a Subminiature Through-Hole Fuse Holder) often manufactured by companies like **Littelfuse**. Below is a detailed breakdown of its electronic characteristics and specifications. --- ## 1. Component Overview The 543-R series is designed for space-constrained Printed Circuit Board (PCB) applications. It is a vertical mount holder used to house subminiature fuses (like the TE5 or TR5 series). | Feature | Description | | :--- | :--- | | **Component Type** | Fuse Holder | | **Mounting Type** | Through-Hole (PCB) | | **Orientation** | Vertical | | **Lead Finish** | Tin-plated (indicated by the "-R" suffix for RoHS compliance) | --- ## 2. Technical Specifications These parts are engineered to handle specific electrical loads and environmental conditions. ### Electrical Ratings * **Voltage Rating:** Typically rated up to **250V**. * **Current Rating:** Capable of handling up to **6.3A** or **10A** depending on the specific sub-variant. * **Contact Resistance:** Low resistance (usually < 5mΩ) to minimize power loss. ### Physical Dimensions * **Lead Spacing:** Standard **5.08mm** (0.2 inch) pitch. * **Material:** Thermoplastic body (UL 94 V-0 flammability rating). * **Compatible Fuse Size:** Designed for circular or rectangular subminiature fuses. --- ## 3. Key Advantages 1. **Safety:** Allows for easy fuse replacement without soldering directly to the fuse leads. 2. **Space Efficiency:** The vertical profile saves significant "real estate" on a crowded PCB. 3. **Compliance:** The "R" in the part number usually signifies **RoHS Compliance**, meaning it is free from hazardous substances like lead. --- ## 4. Common Applications The 543-R fuse holder is found in various power-sensitive electronic devices: * **Power Supplies:** Switched-mode power supplies (SMPS). * **Battery Chargers:** Protection against overcurrent. * **Consumer Electronics:** Televisions, monitors, and audio equipment. * **Industrial Controls:** Protecting delicate sensors and control circuits. ---