## FP1109-R20-R Electronic Component Overview The **FP1109-R20-R** is a high-frequency, high-current power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the **FP1109 series** of Flat-Pac™ inductors, designed primarily for high-density power conversion applications. ### 1. Key Specifications | Feature | Specification | | :--- | :--- | | **Inductance** | 200 nH (0.20 µH) | | **Tolerance** | ±10% | | **DC Resistance (DCR)** | 0.42 mΩ (Typical) | | **Saturation Current ($I_{sat}$)** | ~53 Amperes | | **RMS Current ($I_{rms}$)** | ~34 Amperes | | **Package/Case** | Surface Mount (SMD) | | **Dimensions** | 11.0mm x 9.0mm x 9.0mm | --- ### 2. Core Features and Materials * **Ferrite Core Material:** Uses a low-loss ferrite core which allows for high efficiency at high switching frequencies. * **Flat-Pac™ Technology:** The "FP" prefix stands for Flat-Pac, indicating a rectangular, low-profile design that optimizes the copper winding to reduce DC resistance (DCR). * **High Saturation:** It is engineered to handle high peak currents without the inductance dropping significantly, which is critical for preventing circuit failure during power spikes. * **Halogen Free & RoHS Compliant:** Meets modern environmental safety standards for lead-free soldering and hazardous materials. --- ### 3. Common Applications This specific inductor is typically found in high-performance power stages, including: * **Voltage Regulator Modules (VRMs):** Used in CPU and GPU power delivery on motherboards and server cards. * **Multi-phase Buck Converters:** Ideal for distributing high current across multiple phases. * **Point-of-Load (POL) Converters:** Used in networking and telecommunications equipment. * **High-density DC-DC Converters:** Where space is limited but power requirements are high. --- ### 4. Part Number Breakdown The part number follows a specific nomenclature: * **FP1109:** The series designation and physical size (approx. 11mm x 9mm). * **R20:** The inductance value. "R" acts as a decimal point, so R20 = **0.20 µH**. * **-R:** Indicates the part is **RoHS compliant**. ---