The **LRF2010-R02JPB** is a high-precision, low-resistance surface mount (SMD) resistor manufactured by **TT Electronics / Welwyn**. It is part of the LRF series, specifically designed for current sensing applications where accuracy and thermal stability are critical. --- ### 1. Key Technical Specifications The following table outlines the core electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Resistance Value** | 20 mΩ (0.02 Ω) | | **Tolerance** | ±5% (indicated by 'J' in the part number) | | **Power Rating** | 1 Watt (at 70°C) | | **Package / Case** | 2010 (5025 Metric) | | **Temperature Coefficient (TCR)** | ±100 ppm/°C | | **Technology** | Thick Film | | **Operating Temperature** | -55°C to +150°C | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying specific variants: * **LRF**: Low Resistance Flip-chip series. * **2010**: The physical dimensions of the chip (0.20 x 0.10 inches). * **R02**: The resistance value (R02 = 0.02 Ω or 20 mΩ). * **J**: Tolerance code (J = ±5%). * **PB**: Packaging code (typically refers to Lead-Free/RoHS compliant tape and reel). --- ### 3. Functional Features * **Current Sensing:** Because of its very low resistance, it is used to measure current flow by monitoring the voltage drop across it ($V = I \times R$). * **Thermal Management:** The 2010 package size provides a larger surface area compared to 1206 or 0805 resistors, allowing it to dissipate up to 1W of heat without shifting resistance significantly. * **AEC-Q200 Qualified:** Most parts in this series are automotive grade, meaning they are tested for high reliability in harsh environments. --- ### 4. Common Applications 1. **Power Management:** DC-DC converters and voltage regulators. 2. **Battery Monitoring:** Sensing charge and discharge currents in Li-ion battery packs. 3. **Motor Control:** Detecting overcurrent conditions in small motors. 4. **Consumer Electronics:** Laptop power adapters and mobile device charging circuits. ---