The **MH13TDG-R** is an electronic component primarily classified as a **Hall Effect Switch IC**. These sensors are widely used in consumer electronics, automotive applications, and industrial machinery to detect the presence of a magnetic field. --- ### 1. Key Technical Specifications Below are the typical specifications for this type of magnetic sensor: | Feature | Specification | | :--- | :--- | | **Part Number** | MH13TDG-R | | **Type** | Unipolar/Omnipolar Hall Effect Switch | | **Operating Voltage** | 1.6V to 6.0V (Low Power) | | **Output Type** | CMOS Output | | **Switching Point** | High sensitivity (typically < 60 Gauss) | | **Package Type** | SOT-23 / TSOT-23 (Small Surface Mount) | | **Supply Current** | ~5-10 µA (Average) | --- ### 2. Functional Description The MH13TDG-R operates by sensing magnetic flux perpendicular to the sensor face. * **Sensing Mechanism:** When a magnetic field of sufficient strength (Operating Point, $B_{OP}$) is applied to the sensor, the internal transistor turns ON, pulling the output to a specific logic state. * **Release Point:** When the magnetic field drops below a certain threshold (Release Point, $B_{RP}$), the output returns to its high-impedance or opposite logic state. * **Hysteresis:** The device includes built-in hysteresis to prevent "chattering" or output instability when the magnet is near the switching threshold. --- ### 3. Application Use Cases Because of its small footprint and low power consumption, it is commonly found in: 1. **Lid/Cover Detection:** Used in laptops, flip-phones, or smart tablet covers to trigger sleep/wake modes. 2. **Liquid Level Sensing:** Detecting a magnetic float in a tank. 3. **Proximity Switching:** Replacing mechanical reed switches for better reliability and longer life. 4. **Pulse Counting:** Measuring RPM in small fans or motors by counting magnet passes. --- ### 4. Circuit Implementation Typically, the MH13TDG-R requires very few external components. ```c // Typical Pin Configuration (SOT-23) Pin 1: VDD (Power Supply) Pin 2: VOUT (Signal Output) Pin 3: GND (Ground) ``` **Note:** A bypass capacitor (usually 0.1µF) is recommended between VDD and GND to filter out power supply noise.