The **UDN302G-AE3-R** is a specialized integrated circuit, primarily designed as a **Linear Hall Effect Sensor**. It is commonly manufactured by UTC (Unisonic Technologies Co., Ltd). --- ### 1. General Specifications This device is a magnetic field sensor that outputs an analog voltage proportional to the magnetic flux density it detects. | Parameter | Description | | :--- | :--- | | **Component Type** | Linear Hall Effect Sensor IC | | **Package Type** | SOT-23-3 (Surface Mount) | | **Output Type** | Analog (Ratiometric) | | **Operating Voltage** | Typically 3.0V to 6.5V | | **Sensitivity** | High sensitivity to magnetic poles (North/South) | | **RoHS Status** | Lead-free / Halogen-free (denoted by "G" and "R") | --- ### 2. Pin Configuration (SOT-23-3) The UDN302G typically follows a standard 3-pin layout for Hall sensors: 1. **VCC**: Power Supply (Input) 2. **GND**: Ground 3. **VOUT**: Analog Output Voltage --- ### 3. Key Functional Features * **Ratiometric Output**: The output voltage is set by the supply voltage and varies in direct proportion to the strength of the magnetic field. * **Quiescent Voltage**: When no magnetic field is present (0 Gauss), the output is typically half of the supply voltage ($V_{CC} / 2$). * **Temperature Stability**: It includes internal temperature compensation circuitry to ensure accuracy across a wide range of operating temperatures. * **Low Noise**: The internal design minimizes electrical noise to provide a clean signal for microcontrollers (ADCs). --- ### 4. Part Number Decoding The suffix provides specific manufacturing details: * **UDN302**: Base Part Number (Linear Hall Sensor). * **G**: Halogen-Free and Lead-Free (Green). * **AE3**: Package code for SOT-23. * **R**: Tape and Reel (Packaging method). --- ### 5. Common Applications * **Current Sensing**: Measuring the magnetic field around a wire to determine current flow. * **Position Sensing**: Determining the proximity or displacement of a magnet in mechanical systems. * **Motor Control**: Detecting the position of rotors in brushless DC (BLDC) motors. * **Magnetic Code Reading**: Identifying patterns in magnetized strips. ---