The **FP0906R1-R120-R** is a high-current, shielded drum core power inductor manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the FP0906 series, specifically designed for high-frequency voltage regulator modules (VRMs). --- ### 1. Technical Specifications | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 120 nH (0.12 µH) | | **Tolerance** | ±10% | | **Saturation Current ($I_{sat}$)** | 67 A (approx.) | | **RMS Current ($I_{rms}$)** | 55 A | | **DC Resistance (DCR)** | 0.29 mΩ (Typical) | | **Footprint (L x W)** | 9.0 mm x 6.0 mm | | **Height** | 6.0 mm | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **FP0906**: Series identifier. "0906" refers to the physical dimensions (approx. 9mm x 6mm). * **R1**: Revision or internal designator for the series construction. * **R120**: Represents the inductance value. The "R" acts as a decimal point, and the value is in microhenries ($\mu H$). Thus, $R120 = 0.12 \mu H$. * **-R**: Indicates the part is RoHS compliant. --- ### 3. Key Features & Materials 1. **High Current Handling**: Due to the extremely low DCR (0.29 mΩ), the part can handle massive amounts of current with minimal self-heating. 2. **Ferrite Core Material**: This material ensures low core losses at high frequencies, which is essential for modern DC-DC converters. 3. **Shielded Construction**: The design minimizes Electromagnetic Interference (EMI), protecting nearby sensitive components on the PCB. 4. **Controlled DCR**: The tight DCR tolerance allows for accurate "DCR Sensing" circuits used by power controller ICs to monitor current. --- ### 4. Typical Applications * **Multi-phase Vcore Regulators**: Used in CPU and GPU power delivery modules for servers and high-end desktops. * **Voltage Regulator Modules (VRMs)**: Converting 12V bus voltage to low-voltage, high-current rails (e.g., 0.8V - 1.8V). * **Data Centers**: Integrated into high-density power systems where space and efficiency are critical. * **Point-of-Load (POL) Converters**: High-speed switching power supplies. ---