The part number **48AV-2YHH-R** typically refers to a specialized high-performance **DC Axial Fan**, often manufactured by companies like **Sanyo Denki** (San Ace series). These fans are engineered for high-density cooling in servers, telecommunications, and industrial power supplies. --- ## Technical Specifications & Features The following table breaks down the core technical characteristics of this electronic component: | Feature | Specification (Typical) | | :--- | :--- | | **Component Type** | DC Axial Cooling Fan | | **Nominal Voltage** | 48V DC | | **Operating Voltage Range** | 36V to 72V DC | | **Dimensions** | 40mm x 40mm x 28mm (Typical "4028" size) | | **Bearing Type** | Dual Ball Bearing | | **Termination** | Lead Wires (usually 4-wire for PWM) | | **Control Signal** | PWM (Pulse Width Modulation) speed control | | **Sensor Output** | Tachometer (Speed Sensor / FG Signal) | --- ## Breakdown of Part Number Elements While specific manufacturer coding can vary slightly, the nomenclature usually follows this logic: ### 1. Voltage (48) Indicates a **48V DC** input. This is standard for telecommunications equipment and large-scale data center racks where higher voltage is preferred to reduce current draw and wire thickness. ### 2. Series / Frame Size (AV) Refers to the high-static pressure or high-airflow series. The "V" often denotes a "Very High Speed" or specific blade geometry designed to push air through restricted spaces (like finned heatsinks). ### 3. Control & Feedback (2YHH) * **PWM Control:** Allows the system motherboard or controller to dynamically adjust the fan speed based on temperature. * **Tachometer Output:** Sends a square-wave signal back to the system to monitor RPM and detect if the fan has stalled. * **HH Rating:** Usually signifies "High-High" or "Ultra-High" speed rating, often exceeding 15,000+ RPM. --- ## Electronic Protection Features Most fans in this category include integrated circuitry to protect the motor and the host system: * **Locked Rotor Protection:** Automatically cuts or reduces power if the blades are physically obstructed to prevent the coils from burning out. * **Reverse Polarity Protection:** Prevents damage if the positive and negative leads are accidentally swapped. * **Soft Start:** Gradually ramps up the motor speed to prevent sudden current spikes on the power rail. --- ## Typical Applications * **1U/2U Servers:** Due to the 40mm height, these are perfect for slim rackmount chassis. * **Network Switches:** High-density cooling for high-speed processors. * **Industrial Inverters:** Cooling power electronics in 48V environments.