The **LOR3E-R010-D** is a high-precision, low-resistance metal strip shunt resistor. These components are primarily used for current sensing in power electronics. ### 1. Key Technical Specifications Below are the typical technical parameters for the LOR series (specifically the R010 variant): | Parameter | Specification | Description | | :--- | :--- | :--- | | **Resistance Value** | 10 mΩ (0.010 Ω) | The electrical resistance of the part. | | **Tolerance** | ±0.5% (D) | The "D" suffix denotes a 0.5% precision rating. | | **Power Rating** | 3 Watts | The maximum power it can dissipate at rated temperature. | | **Temperature Coefficient** | ±50 ppm/°C | Stability of resistance over temperature changes. | | **Construction** | Metal Strip / Alloy | Provides high thermal stability and low inductance. | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying the specific capabilities of the component: * **LOR**: Series name (Low Ohmic Resistor / Metal Strip Shunt). * **3E**: Size/Power rating (typically 3 Watts in a specific SMD footprint like 2512 or similar). * **R010**: Resistance value. "R" acts as the decimal point (0.010 Ohms). * **D**: Tolerance code. In the resistor industry, **D = ±0.5%**. --- ### 3. Application and Usage Because this part has a very low resistance (10 milliohms), it is used as a **Current Sense Resistor**. #### How it works: When current ($I$) flows through this resistor, a small voltage ($V$) is dropped across it according to Ohm's Law ($V = I \times R$). Because the resistance ($R$) is known and highly accurate, a microcontroller or an amplifier can measure the voltage to determine the exact current flowing through the circuit. #### Common Uses: * **Battery Management Systems (BMS):** Monitoring charge and discharge cycles. * **DC-DC Converters:** Controlling output current. * **Motor Control:** Detecting stall conditions or managing torque. * **Power Supplies:** Over-current protection circuits. --- ### 4. Physical Characteristics * **Low Inductance:** The metal strip design minimizes parasitic inductance, making it suitable for high-frequency switching applications. * **Thermal Management:** These parts are designed to withstand high temperatures and are often constructed with materials that have excellent heat dissipation properties. ---