## Technical Overview of the AFB0812SH-R00 The **AFB0812SH-R00** is a high-performance axial cooling fan manufactured by **Delta Electronics**. It is part of the AFB series, known for its balance between high airflow and reliability. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Frame Size** | 80mm x 80mm x 25.4mm | | **Rated Voltage** | 12 VDC | | **Operating Voltage Range** | 7.0 to 13.8 VDC | | **Rated Current** | 0.34 A (Max 0.51 A) | | **Rated Power** | 4.08 W | | **Speed** | 4000 RPM | | **Airflow** | 46.62 CFM (1.320 m³/min) | | **Static Pressure** | 0.267 in H2O (6.78 mmH2O) | | **Noise Level** | 40.0 dB-A | | **Bearing Type** | Dual Ball Bearing | --- ### 2. Detailed Electronic Components & Features #### A. The "R00" Suffix (Sensor Output) The **R00** designation is critical. It indicates that this fan is equipped with a **Locked Rotor Sensor** (also known as a failure detector or "Stop Signal"). * **Function:** Unlike a Tachometer (FG) signal which pulses with rotation, the R00 signal stays at a low logical level while the fan is spinning. If the fan blades are obstructed and stop moving, the signal output goes **High**. * **Usage:** This is used by motherboards or industrial controllers to trigger an immediate emergency shutdown or alarm if the cooling fails. #### B. Motor and Drive System * **Brushless DC (BLDC) Motor:** The fan uses a 3-phase or 4-pole brushless motor, which reduces mechanical wear and electromagnetic interference (EMI). * **IC Driver:** It contains an internal integrated circuit (IC) that handles the electronic commutation of the coils based on the position of the rotor. #### C. Bearing System * **Dual Ball Bearings:** The "SH" (Super High speed) variant utilizes two sets of ball bearings. * **Benefit:** This provides a significantly longer lifespan (L10 expectancy of ~70,000 hours at 40°C) compared to sleeve bearings, and allows the fan to be mounted in any orientation (horizontal, vertical, or angled) without affecting performance. #### D. Safety and Protection Features * **Polarity Protection:** Prevents damage if the positive and negative leads are reversed. * **Locked Rotor Protection:** The IC will automatically attempt to restart the motor periodically if it detects a stall, preventing the coils from overheating. --- ### 3. Wiring Configuration The AFB0812SH-R00 typically features a 3-wire lead system: 1. **Red Wire:** Positive (+12V) 2. **Black Wire:** Negative (GND) 3. **Blue/White Wire:** R00 Sensor (Locked Rotor Alarm) - This is an **Open Collector** output, meaning it requires a pull-up resistor to the system voltage to function correctly.