The part number **47LPQ-4W0R-R** refers to a high-current, low-profile power inductor typically manufactured by companies like **Coiltronics (now part of Eaton)** or similar magnetic component specialists. These components are designed for high-density power applications where space and efficiency are critical. --- ### 1. Technical Specifications Based on the standard nomenclature for the 47LPQ series, here are the primary technical characteristics: | Parameter | Specification (Typical) | | :--- | :--- | | **Inductance** | 0.40 µH (indicated by 4W0R) | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | Extremely Low (typically < 1.0 mΩ) | | **Saturation Current ($I_{sat}$)** | Very High (often 50A - 100A+) | | **Configuration** | Surface Mount (SMD) | | **Material** | Ferrite core with flat-wire construction | --- ### 2. Breakdown of the Part Number The alphanumeric string follows a specific coding logic: * **47LPQ**: Series designation. "LPQ" usually stands for **Low Profile, High Q** (efficiency). * **4W0R**: The inductance value. The "R" acts as a decimal point, and "W" often indicates a specific winding or wire style. 4R0 would be 4.0µH; **4W0R** indicates **0.40 µH**. * **-R**: Indicates compliance with **RoHS** (Restriction of Hazardous Substances) standards. --- ### 3. Key Features * **Flat-Wire Technology**: Uses flat copper wire instead of round wire. This increases the surface area, reducing the skin effect and allowing for much higher current handling in a smaller footprint. * **Low DCR**: Minimizes power loss (heat) during operation, which is vital for high-efficiency power supplies. * **Magnetic Shielding**: The construction usually minimizes electromagnetic interference (EMI), which is important for sensitive surrounding electronics. --- ### 4. Common Applications These inductors are found in high-performance power management modules: 1. **Voltage Regulator Modules (VRMs)**: Used on computer motherboards and servers to power CPUs and GPUs. 2. **DC-DC Converters**: Found in telecommunications equipment and industrial power systems. 3. **Point of Load (POL) Power Supplies**: Used to step down voltage locally on a PCB. 4. **High-Current Battery Systems**: Used in automotive or portable power management. ---