The **LR2010-R02FT1** is a low-resistance, surface-mount (SMD) metal film chip resistor typically used for current sensing applications. Below is a detailed technical breakdown of this electronic part. --- ### 1. General Specifications | Feature | Specification | | :--- | :--- | | **Package / Case** | 2010 (Inch) / 5025 (Metric) | | **Resistance Value** | 20 mΩ (0.02 Ω) | | **Tolerance** | ±1% (F) | | **Power Rating** | 1 Watt | | **Technology** | Metal Strip / Metal Film | | **Temperature Coefficient** | ±100 ppm/°C (Typical) | --- ### 2. Part Number Breakdown The nomenclature for this part usually follows a specific manufacturing logic (often associated with brands like **Welwyn/TT Electronics** or **LRC**): * **LR**: Series Designation (Low Resistance/Current Sense). * **2010**: Physical size (0.20 inches x 0.10 inches). * **R02**: Resistance value (R denotes the decimal point; R02 = 0.02Ω). * **F**: Tolerance code (F = ±1%). * **T1**: Packaging code (usually T1 refers to Tape & Reel packaging). --- ### 3. Key Characteristics and Usage #### A. Current Sensing Because the resistance is extremely low (20 mΩ), this part is designed to be placed in series with a load. By measuring the voltage drop across this resistor ($V = I \times R$), a microcontroller or IC can calculate the current flowing through the circuit with minimal power loss. #### B. High Power Density The 2010 form factor is larger than standard 0805 or 1206 resistors, allowing it to dissipate up to **1 Watt** of heat. This is crucial for power supply and battery management circuits. #### C. Typical Applications * **Battery Management Systems (BMS):** Monitoring charge/discharge cycles. * **DC-DC Converters:** Controlling output current. * **Motor Control:** Detecting stall conditions or managing torque. * **Power Inverters:** Protection against over-current scenarios. --- ### 4. Schematic Representation In a circuit diagram, it is represented as a standard resistor, but often features a "Kelvin" connection (4-wire) layout on the PCB to ensure the resistance of the copper traces does not interfere with the tiny 20mΩ measurement. ```cpp // Logic for Current Calculation using this part: float voltageDrop = readADC(); // Voltage measured across LR2010 float resistance = 0.020; // 20mOhms float current = voltageDrop / resistance; ``` ---