The **FP0708R1-R19-R** is a high-current, shielded drum core power inductor designed by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the FP0708 series, commonly used in high-frequency voltage regulator modules (VRMs). --- ### Technical Specifications The following table outlines the key electrical and physical characteristics of this specific component: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 190 nH (0.19 µH) | | **Tolerance** | ±10% | | **DC Resistance (DCR)** | 0.42 mΩ (Typical) | | **Saturation Current ($I_{sat}$)** | 64 Amps | | **RMS Current ($I_{rms}$)** | 42 Amps | | **Operating Temperature** | -40°C to +125°C | | **Dimensions** | 7.2mm x 8.5mm x 7.5mm | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ### Part Number Breakdown Understanding the nomenclature helps in identifying variations of the series: 1. **FP0708**: The Series designation (indicates physical size: ~7mm x 8mm). 2. **R1**: Revision level or specific internal design iteration. 3. **R19**: Inductance value in microhenries ($\mu H$). "R" acts as a decimal point, so R19 = **0.19 µH**. 4. **-R**: RoHS compliance suffix. --- ### Key Features and Applications #### Features * **High Power Density:** Capable of handling very high currents relative to its small footprint. * **Low DCR:** The extremely low DC resistance (measured in milliohms) minimizes power loss and heat generation. * **Ferrite Core:** Utilizes a ferrite material that provides low core losses at high switching frequencies. * **Shielded Construction:** Reduces Electromagnetic Interference (EMI) to neighboring components. #### Common Applications * **Multi-phase buck regulators:** Used in CPU/GPU power supplies. * **Voltage Regulator Modules (VRM):** Specifically for servers and workstations. * **Desktop and Laptops:** High-current DC-DC converters. * **Point-of-Load (POL) Converters:** Providing stable power to ASICs and FPGAs. --- ### Performance Considerations When implementing this inductor, engineers must account for **Saturation Current ($I_{sat}$)**. Because this is a 190nH inductor, it is designed for very high-speed switching. If the current exceeds 64A, the inductance will drop significantly, potentially leading to circuit instability or overheating.