The **F2VF-A5W-R** is a high-performance **Electromechanical Power Relay** manufactured by **Fujitsu** (specifically within their F2VF series). These relays are designed for high-current applications, primarily within the automotive and industrial sectors. Below is a breakdown of its technical specifications and electronic characteristics. --- ## 1. General Specifications The part number can be decoded to understand its primary electrical behavior: | Feature | Specification | | :--- | :--- | | **Series** | F2VF | | **Coil Voltage** | 5V DC | | **Contact Arrangement** | 1 Form A (SPST-NO: Single Pole Single Throw - Normally Open) | | **Terminal Type** | PCB (Printed Circuit Board) Through-hole | | **Mounting Style** | Plastic Sealed (Washable) | --- ## 2. Electrical Characteristics These parameters define how the component behaves within a circuit under load. ### Coil Side (Input) * **Nominal Voltage:** 5V DC. * **Nominal Operating Power:** Typically around 640mW to 800mW (varies slightly by batch). * **Must Operate Voltage:** ~3.5V DC (at 20°C). * **Must Release Voltage:** ~0.5V DC. ### Contact Side (Output) * **Max Switching Current:** This series is rated for high-current pulses, often used for 25A to 35A loads depending on the specific application environment. * **Max Switching Voltage:** 14V DC (Standard Automotive Voltage). * **Contact Resistance:** Typically $\leq$ 100 $m\Omega$ (initial). --- ## 3. Key Internal Components The "Electronic Parts" inside the housing include: 1. **Electromagnetic Coil:** Copper wire wound around a core that creates a magnetic field when 5V DC is applied. 2. **Armature:** A moving metal piece attracted by the magnetic field. 3. **Spring Mechanism:** Ensures the contacts return to the "Open" state when power is removed. 4. **Silver Alloy Contacts:** Specifically designed to resist "arcing" and "sticking" during high-current switching. 5. **Yoke and Core:** Soft magnetic materials that direct the magnetic flux. --- ## 4. Typical Applications Due to its high current capacity and 5V control logic, it is commonly found in: * **Automotive Control Units:** Power windows, seat adjusters, and central locking. * **Smart Home/IoT Controllers:** Interfacing 5V Microcontrollers (like ESP32 or Arduino) with high-voltage/current DC motors. * **Industrial Automation:** Activating solenoids or heavy DC fans. --- ## 5. Design Considerations * **Flyback Diode:** Since this is an inductive load (the coil), always place a **Flyback Diode** (e.g., 1N4007) in parallel with the coil (pointing against the flow of current) to protect your control circuit from voltage spikes. * **Heat Dissipation:** Under high continuous current, the contacts generate heat; ensure the PCB traces are thick enough (high copper weight) to handle the 25A+ load.