The **LOR3E-R10-F** is a specialized electronic component, typically identified as a **high-precision, low-resistance current sense resistor** (often part of a specific manufacturer's series like Ohmite or similar metal strip resistor providers). These components are designed to measure current by monitoring the voltage drop across a known resistance. --- ### 1. Technical Specifications | Feature | Description | | :--- | :--- | | **Component Type** | Current Sense Resistor (Metal Strip/Shunt) | | **Resistance Value** | 0.10 $\Omega$ (100m$\Omega$) | | **Tolerance** | $\pm 1\%$ (indicated by the 'F' suffix) | | **Power Rating** | Typically 3W (standard for the LOR3 series) | | **Temperature Coefficient** | Low TCR (usually $\pm 50$ to $\pm 100$ ppm/°C) | | **Package/Style** | Radial leaded or specialized through-hole | --- ### 2. Breakdown of the Part Number Understanding the nomenclature helps in identifying the specific properties: * **LOR**: Refers to the series (Low-Ohmic Resistor). * **3**: Represents the power rating (3 Watts). * **E**: Often denotes the coating or specific material (Epoxy or Environmental standard). * **R10**: The resistance value. "R" acts as the decimal point ($0.10 \Omega$). * **F**: The tolerance code ($\pm 1\%$). --- ### 3. Key Electronic Functions These parts are engineered for performance in power management circuits: 1. **Current Sensing:** Used in series with a load. By measuring the voltage ($V$) across the $0.10 \Omega$ resistor, the system calculates current ($I$) using Ohm’s Law: $I = V / R$. 2. **Heat Dissipation:** Due to the 3W rating, the part is designed to handle significant thermal energy without shifting its resistance value. 3. **Low Inductance:** Unlike standard wire-wound resistors, metal strip resistors like the LOR3E have very low inductance, making them suitable for high-frequency switching power supplies. --- ### 4. Common Applications * **Power Supplies:** Monitoring output current for over-current protection. * **Battery Management Systems (BMS):** Tracking charge and discharge cycles in Lithium-ion packs. * **Motor Control:** Feedback loops to regulate torque and speed. * **DC-DC Converters:** Efficiency monitoring in voltage regulation modules. ---