The **LRF2010-R01FW** is a high-power, low-resistance SMT (Surface Mount Technology) shunt resistor manufactured by **TT Electronics/Welwyn**. It is primarily designed for current sensing applications where precision and heat dissipation are critical. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Resistance Value** | 0.01 Ohms (10 mΩ) | | **Tolerance** | ±1% (F) | | **Power Rating** | 1.0 Watt | | **Package Size** | 2010 (5.0mm x 2.5mm) | | **Temperature Coefficient (TCR)** | ±100 ppm/°C | | **Technology** | Thick Film on Ceramic | | **Operating Temperature** | -55°C to +150°C | --- ### 2. Physical Structure & Features * **AEC-Q200 Qualified:** This part is often used in automotive applications, meaning it meets rigorous stress-test standards for vibration, thermal shock, and moisture resistance. * **Low Inductance:** Because it is a flat chip resistor, it has very low parasitic inductance, making it suitable for high-frequency switching circuits. * **Thermal Management:** The 2010 footprint provides a larger surface area compared to standard 0805 or 1206 resistors, allowing it to handle 1W of power without overheating the PCB. --- ### 3. Functional Applications The LRF2010-R01FW is used as a **Current Sense Resistor** (Shunt). It works based on Ohm’s Law ($V = I \times R$): 1. **Current Monitoring:** By placing this resistor in series with a load, a small voltage drop is created. 2. **Feedback Loop:** A controller (like a PWM chip or Microcontroller) measures this voltage to determine how much current is flowing. 3. **Protection:** It is commonly used for over-current protection in battery management systems (BMS) and motor controllers. --- ### 4. Part Number Breakdown The nomenclature follows this logic: * **LRF:** Low Resistance Flip-chip/Large footprint series. * **2010:** Package size (20 mils by 10 mils nominal). * **R01:** Resistance value ($0.01\Omega$). * **F:** Tolerance ($\pm1\%$). * **W:** Packaging code (usually refers to Tape & Reel).