The **LOR3E-R010-G** is a high-precision, low-resistance current sensing resistor typically manufactured by brands like **LIZ Electronics**. It belongs to the **Metal Foil** or **Metal Element** resistor family, designed specifically for power management and current detection. --- ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify its specific electrical characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **LOR** | Series | Low Ohmic Metal Strip Resistor | | **3E** | Case Size | 2512 (Inch) / 6432 (Metric) | | **R010** | Resistance Value | 0.010 $\Omega$ (10 m$\Omega$) | | **G** | Tolerance | $\pm$2% | --- ### 2. Technical Specifications These parts are engineered to handle high current while maintaining thermal stability. * **Resistance:** 10 Milliohms ($0.010 \Omega$) * **Power Rating:** Typically 2W to 3W (standard for the 2512/LOR series). * **Temperature Coefficient (TCR):** Usually low (e.g., $\pm$50ppm/°C to $\pm$100ppm/°C), ensuring the resistance doesn't drift significantly as the part heats up. * **Construction:** Metal plate/foil element with a protective coating, offering superior heat dissipation compared to standard thick-film resistors. --- ### 3. Key Electronic Functions #### A. Current Sensing (Shunt) The primary role of this part is to act as a **Shunt Resistor**. According to Ohm's Law ($V = I \times R$), a known resistance allows a circuit controller to measure the voltage drop across the component to determine the exact current flowing through the system. #### B. Power Management Because it has a very low resistance (10m$\Omega$), it minimizes "Insertion Loss." It allows high current to pass through without wasting significant energy as heat, making it ideal for battery management systems (BMS). #### C. Overcurrent Protection By monitoring the voltage across the LOR3E-R010-G, a protection circuit can trigger a shutdown if the current exceeds safe limits, preventing damage to the rest of the device. --- ### 4. Common Applications * **DC-DC Converters:** Monitoring output current for regulation. * **Battery Chargers:** Managing charging rates for Li-ion or Lead-acid batteries. * **Motor Control:** Detecting stall currents or managing torque in small motors. * **Laptop/Mobile Power:** Distributing power from the USB-C or DC input. ---