The **L813PW-R47MF** is a high-performance **Surface Mount (SMD) Power Inductor**, commonly used in DC-DC converter applications and power management modules. Below is a detailed breakdown of its specifications and electronic characteristics. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical properties. | Parameter | Specification | Details | | :--- | :--- | :--- | | **Inductance** | 0.47 µH | The "R47" in the part number indicates 0.47 microhenries. | | **Tolerance** | ±20% | The "M" suffix represents a 20% tolerance range. | | **Material** | Metal Alloy / Iron Powder | Shielded construction for low EMI. | | **DCR (DC Resistance)** | ~1.5 mΩ - 3.0 mΩ | Very low resistance to minimize power loss. | | **Saturation Current ($I_{sat}$)** | ~25A - 35A | The current at which inductance drops by a specific percentage. | | **Heat Rating Current ($I_{rms}$)** | ~18A - 25A | The continuous current that causes a 40°C temperature rise. | --- ### 2. Physical Characteristics The "813" designation typically refers to the physical footprint of the component. * **Size Code:** 813 (Approx. 8.0mm x 8.0mm x 3.0mm - 4.0mm). * **Mounting Type:** Surface Mount Device (SMD/SMT). * **Shielding:** Magnetically shielded, which prevents interference with surrounding components on the PCB. * **Termination:** Lead-free (RoHS compliant) solder pads. --- ### 3. Key Electronic Features * **Low Core Loss:** The metal alloy powder core provides better efficiency at high switching frequencies compared to traditional ferrite cores. * **Soft Saturation:** Unlike ferrite inductors that have a sharp drop-off, this part handles high current peaks more gracefully. * **High Thermal Stability:** Designed to operate in high-temperature environments (often up to 125°C or 150°C). --- ### 4. Common Applications Due to its high current handling and small footprint, the L813PW-R47MF is found in: 1. **Voltage Regulator Modules (VRM):** For CPUs and GPUs in laptops and servers. 2. **Point of Load (POL) Converters:** Distributed power systems on motherboards. 3. **Battery Powered Devices:** High-efficiency power stages for mobile electronics. 4. **Automotive Electronics:** Infotainment and LED lighting drivers.