The **LOR3-R0075-G** is a high-precision, low-resistance current sensing resistor, typically used in power management and current measurement applications. --- ## 1. Component Overview This component belongs to the **LOR Series** (Low Ohmic Resistors). These are designed to measure electrical current by creating a small voltage drop across the resistor, which can then be monitored by a microcontroller or analog circuit. ### Key Specifications | Parameter | Value | Description | | :--- | :--- | :--- | | **Resistance** | 0.0075 $\Omega$ (7.5 m$\Omega$) | The fixed resistance value. | | **Tolerance** | $\pm$ 2% (G) | The allowable variance from the rated resistance. | | **Power Rating** | 3 Watts | The maximum power the component can dissipate safely. | | **Series** | LOR3 | Indicates a 3-Watt rated series. | --- ## 2. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **LOR**: **L**ow **O**hmic **R**esistor series. * **3**: Power rating (3 Watts). * **R0075**: Resistance value (0.0075 Ohms). * **G**: Tolerance code ($\pm 2\%$). --- ## 3. Technical Features 1. **Low Inductance:** Designed to minimize signal noise, making it suitable for high-frequency switching power supplies. 2. **Stability:** High thermal stability ensures the resistance value doesn't drift significantly as the component heats up. 3. **Construction:** Usually made of a metal alloy element with a flameproof coating or ceramic encapsulation to handle heat. --- ## 4. Common Applications * **Battery Management Systems (BMS):** Monitoring charge and discharge cycles in Lithium-ion packs. * **Motor Control:** Detecting stalls or overcurrent conditions in DC motors. * **DC-DC Converters:** Providing feedback for current-mode PWM controllers. * **Overcurrent Protection:** Acting as a "fuse-like" sensor to trigger safety shut-offs. --- ## 5. Calculation Example If you pass **10 Amperes** through this resistor: * **Voltage Drop ($V = I \times R$):** $10A \times 0.0075\Omega = 0.075V$ (75mV). * **Power Dissipated ($P = I^2 \times R$):** $10^2 \times 0.0075 = 0.75W$. * *Since 0.75W is well below the 3W rating, the component will operate safely.*