### Overview of LOR3-R0025-G The **LOR3-R0025-G** is a high-precision, low-resistance shunt resistor designed primarily for current sensing applications. It belongs to the **LOR series** (Open Air Metal Element Resistors) manufactured by companies like **LIZ Electronics** or similar precision component specialists. --- ### Technical Specifications Below are the primary electronic characteristics of the LOR3-R0025-G: | Feature | Specification | | :--- | :--- | | **Resistance Value** | 0.025 $\Omega$ (25 m$\Omega$) | | **Power Rating** | 3 Watts | | **Tolerance** | $\pm$ 2% (indicated by 'G') | | **Technology** | Metal Element / Open Air | | **Package Type** | Radial Lead (Through-Hole) | | **Temperature Coefficient** | Low TCR (typically $\pm$50 to $\pm$100 ppm/°C) | --- ### Part Number Breakdown Understanding the nomenclature helps identify its specific electronic properties: * **LOR**: Series name (Low Ohmic Resistor / Open Air Metal Element). * **3**: Power rating (3 Watts). * **R0025**: Resistance value (0.025 Ohms). * **G**: Resistance tolerance ($\pm$ 2%). --- ### Key Electronic Features 1. **Current Sensing:** Because of its extremely low resistance (25m$\Omega$), it is used to measure current by monitoring the voltage drop across the resistor ($V = I \times R$) with minimal energy loss. 2. **Open Air Design:** The "U-shaped" or "open air" metal element design allows for superior heat dissipation compared to standard ceramic resistors. This prevents the component from overheating during high-current loads. 3. **Low Inductance:** The simple metal wire/strip construction ensures low self-inductance, making it suitable for high-frequency switching power supplies. 4. **Flameproof Construction:** The materials used are generally non-flammable, ensuring safety in fault conditions. --- ### Typical Applications * **Power Supplies:** Used in feedback loops for Switch Mode Power Supplies (SMPS). * **Motor Control:** Monitoring current to prevent motor stalls or over-current damage. * **Battery Management Systems (BMS):** Measuring charge and discharge cycles in battery packs. * **Automotive Electronics:** Used in various vehicle control modules. ---