The **XF100807-R31M** is a high-current, surface-mount (SMD) power inductor commonly used in DC-DC converters and high-frequency power supplies. It is designed to handle significant current with minimal energy loss. --- ## 1. Technical Specifications The part number follows a standard industry naming convention for inductors. Here are the core electronic characteristics: | Parameter | Value / Description | | :--- | :--- | | **Inductance** | 0.31 µH (denoted by "R31") | | **Tolerance** | ±20% (denoted by "M") | | **Package Size** | ~10.0 x 8.0 x 7.0 mm (approximate) | | **Construction** | Shielded, Composite/Molded Powder | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ## 2. Key Electronic Features ### A. High Current Saturation ($I_{sat}$) Due to its low inductance (0.31 µH), this component is engineered to handle very high saturation currents (often exceeding 30A-50A depending on the specific manufacturer series). The magnetic core is designed not to "saturate" or lose its inductive properties quickly when high current flows through it. ### B. Low DC Resistance (DCR) The "R31" (0.31 µH) value typically implies a very thick internal copper winding. This results in extremely low DCR, which minimizes $I^2R$ power losses and reduces heat generation during operation. ### C. Magnetic Shielding The part is shielded, meaning the magnetic flux is contained within the component body. This is critical for: * **EMI Reduction:** Preventing interference with nearby sensitive circuits. * **Efficiency:** Maintaining a tight magnetic loop. --- ## 3. Typical Applications This specific inductor is usually found in the "Output Filter" stage of power management systems: * **VRMs (Voltage Regulator Modules):** Found on computer motherboards and GPUs. * **Point-of-Load (POL) Converters:** Used to step down voltage for high-end processors/FPGAs. * **Multi-phase Buck Converters:** Used where high efficiency and high current density are required. --- ## 4. Part Number Breakdown While specific manufacturers (like Coilcraft, Vishay, or Eaton) have slight variations, the code generally breaks down as follows: * **XF:** Series identifier (often related to high-frequency or high-temp performance). * **100807:** Physical dimensions (Length 10mm, Width 8mm, Height 7mm). * **R31:** The Inductance value ($0.31$ microhenries). * **M:** Tolerance code (M = $\pm 20\%$).