The **FP1107R1-R51-R** is a high-current, non-isolated power inductor typically used in voltage regulator modules (VRMs) and high-density power applications. It is manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). ### 1. Technical Specifications The part number follows a specific nomenclature. Here is the breakdown of its core parameters: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.51 µH (510 nH) | | **Tolerance** | ±10% | | **DCR (Direct Current Resistance)** | ~0.29 mΩ (Typical) | | **Isat (Saturation Current)** | ~40 A to 60 A (Depends on temp rise) | | **Irms (Rated Current)** | ~50 A | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 11.0mm x 8.0mm x 7.5mm (Vertical) | --- ### 2. Key Features The FP1107 series is designed for "Flat-Pac" applications, focusing on high efficiency and thermal stability. * **Low DCR:** The very low DC resistance (measured in micro-ohms) minimizes power loss due to heat ($P = I^2R$), which is critical for high-current power supplies. * **High Saturation:** It uses a ferrite core material that allows it to maintain inductance even when high levels of current pass through it. * **Surface Mount Design:** Specifically designed for automated SMT (Surface Mount Technology) assembly. * **Controlled Inductance Rolloff:** The "R1" designation often refers to a specific core material type optimized for stable performance across varying frequencies. --- ### 3. Typical Applications This component is found in circuits where high current needs to be stepped down efficiently: 1. **Multi-phase Buck Converters:** Used in CPU/GPU power delivery on motherboards. 2. **Voltage Regulator Modules (VRM):** High-speed switching regulators. 3. **Data Center Servers:** Powering high-end processors and ASICs. 4. **Networking Equipment:** High-current DC-DC converters for routers and switches. --- ### 4. Part Number Decoding * **FP1107:** Series name (indicates physical dimensions). * **R1:** Core material/version revision. * **R51:** Inductance value (R = decimal point; 0.51 µH). * **-R:** RoHS compliant / Lead-free. ---