The **LRF3W-R02JW** is a high-power, low-resistance thick film chip resistor manufactured by **IRC / TT Electronics**. It is specifically designed for current sensing applications where precision and high power dissipation are required in a small footprint. --- ### ## Technical Specifications The following table highlights the primary electrical and physical characteristics of the LRF3W-R02JW: | Parameter | Specification | | :--- | :--- | | **Resistance Value** | 0.02 Ω (20 mΩ) | | **Power Rating** | 3 Watts | | **Tolerance** | ±5% (J) | | **Package / Case** | 2512 (Metric 6432) | | **Temperature Coefficient** | ±100 ppm/°C | | **Technology** | Thick Film | | **Operating Temperature** | -55°C to +150°C | --- ### ## Key Features & Construction 1. **Current Sensing Capability:** Due to its very low resistance (0.02 Ohms), it is used to measure current flow by monitoring the voltage drop across the component ($V = I \times R$). 2. **High Power-to-Size Ratio:** While standard 2512 resistors are typically rated for 1W or 2W, the LRF3W series uses a specialized design to achieve a **3W** rating. 3. **Thermal Management:** The part is constructed to provide superior thermal conductivity to the PCB, reducing hot spots during high-current operation. 4. **AEC-Q200 Qualified:** Most variations of this series are automotive grade, ensuring high reliability in harsh environments. --- ### ## Typical Applications * **Power Supplies:** Monitoring output current for over-current protection. * **Motor Control:** Feedback loops for brushless DC (BLDC) motors. * **Battery Management Systems (BMS):** Tracking charge and discharge cycles. * **DC-DC Converters:** Efficiency optimization through precise current monitoring. --- ### ## Internal Structure Code Breakdown The part number **LRF3W-R02JW** can be decoded as follows: * **LRF:** Low Resistance Film series. * **3W:** Power rating of 3 Watts. * **R02:** Resistance value (R is the decimal point, so 0.02 $\Omega$). * **J:** Tolerance code (J = ±5%). * **W:** Packaging suffix (typically refers to Bulk or Tape & Reel depending on context).