The **MAH76FAG-R** is a specific technical component part number, most commonly associated with **DC Axial Fans** (typically manufactured by brands like Delta Electronics or similar industrial cooling suppliers). These fans are designed for high-performance thermal management in servers, telecommunications, and industrial equipment. Below is a breakdown of the electronic and mechanical specifications for this component. --- ### 1. Technical Specifications | Feature | Specification (Typical) | | :--- | :--- | | **Component Type** | DC Axial Fan | | **Voltage (Rated)** | 12V DC (Standard range 7V - 13.8V) | | **Bearing Type** | Dual Ball Bearing (Long life, high reliability) | | **Frame Material** | Plastic (UL 94V-0 Rated) | | **Impeller Material** | Plastic (UL 94V-0 Rated) | | **Termination** | 4-Wire Lead (PWM + Tachometer Output) | | **Signal Type** | Frequency Generator (FG) or Pulse Width Modulation (PWM) | --- ### 2. Pinout Configuration (4-Wire) The "R" suffix often denotes a specific wiring configuration or a signal type (like a rotation detector). Most 4-wire fans follow this standard logic: | Wire Color | Function | Description | | :--- | :--- | :--- | | **Black** | GND | Ground / Negative terminal | | **Red** | VCC | +12V Power Supply | | **Yellow** | Tachometer | Speed sensor signal (2 pulses per revolution) | | **Blue** | PWM | Input signal to control fan speed dynamically | --- ### 3. Key Electronic Features * **PWM Speed Control:** Allows the system motherboard or controller to adjust the fan speed based on temperature, reducing noise and power consumption during low-load periods. * **Locked Rotor Protection:** An internal electronic circuit that cuts or limits power if the blades are physically obstructed, preventing the motor coils from burning out. * **Polarity Protection:** Protects the internal circuitry if the positive and negative leads are accidentally reversed during installation. * **High Airflow-to-Size Ratio:** Designed with optimized blade geometry to move a high volume of air (CFM) even against high static pressure. --- ### 4. Application Use Cases 1. **Server Racks:** High-density cooling for 1U/2U server chassis. 2. **Network Switches:** Cooling internal ASICs and power supplies in telecommunications gear. 3. **Industrial Power Supplies:** Active cooling for high-wattage AC/DC converters. ---