The part number **48AV-2YV4-R** typically refers to a specialized high-performance cooling fan component, often manufactured by companies like **Sanyo Denki** (San Ace series). These are common in servers, telecommunications, and industrial power supplies. --- ### 1. General Specifications Based on the standard nomenclature for this series, here is the technical breakdown: | Parameter | Specification (Typical) | | :--- | :--- | | **Component Type** | DC Axial Cooling Fan | | **Voltage** | 48V DC | | **Dimensions** | 40mm x 40mm x 28mm (Commonly) | | **Bearing Type** | Dual Ball Bearing | | **Control Interface** | PWM (Pulse Width Modulation) | | **Signal Output** | Tachometer / Speed Sensor | --- ### 2. Detailed Part Number Breakdown While manufacturer codes vary slightly, the 48AV series usually follows this logic: * **48**: Represents the nominal input voltage (**48 Volts DC**). * **AV**: Designates the high-airflow/high-static pressure series. * **2**: Often indicates the frame size or a specific generation of the motor. * **YV4**: Refers to the internal motor winding and speed characteristics (High RPM). * **R**: Generally indicates compliance with **RoHS** (Restriction of Hazardous Substances) standards. --- ### 3. Key Electronic Features #### A. Pulse Width Modulation (PWM) The "V4" or trailing codes usually signify a 4-wire configuration. This allows an external controller (like a Motherboard or BMC) to adjust the fan speed dynamically by changing the duty cycle, rather than lowering the voltage. #### B. Tachometer Signal (FG) The fan provides a "Frequency Generator" signal. This is an open-collector output that pulses as the fan spins, allowing the system to monitor the actual RPM and trigger an alarm if the fan stalls. #### C. Protection Circuits These units typically include: * **Locked Rotor Protection:** Prevents the motor from burning out if the blades are physically obstructed. * **Reverse Polarity Protection:** Prevents damage if the positive and negative leads are swapped during installation. --- ### 4. Application Use-Cases Due to the **48V** rating, this part is not used in standard PCs. It is designed for: 1. **Network Switches/Routers:** High-density equipment requiring high static pressure. 2. **Server Power Supplies:** Constant cooling for AC/DC conversion. 3. **Industrial Inverters:** Cooling for high-voltage power electronics.