The **FP0807R1-R18-R** is a high-current, shielded drum core power inductor typically used in voltage regulator modules (VRMs) and high-density DC-DC converters. It is manufactured by **Eaton (formerly Cooper Bussmann)** as part of the FP0807 series. --- ### 1. Technical Specifications The part number encodes the specific characteristics of the component. Below are the primary electrical and physical specifications: | Parameter | Specification | | :--- | :--- | | **Inductance** | 180 nH (0.18 µH) | | **Tolerance** | ±10% | | **Current Rating (Irms)** | 42 Amps (Typical) | | **Saturation Current (Isat)** | 55 Amps @ 25°C | | **DC Resistance (DCR)** | 0.44 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Footprint / Size** | 7.4mm x 7.6mm x 7.0mm | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying variants: - **FP0807**: Series designation (Indicates the physical size and package type). - **R1**: Revision level or internal design code. - **R18**: The inductance value. "R" acts as a decimal point ($0.18 \mu H$). - **-R**: Indicates compliance with **RoHS** (Lead-free). --- ### 3. Key Electronic Features * **High Current Handling:** Designed specifically for multi-phase buck converters where high current levels (up to 55A peak) are common. * **Low DCR:** The extremely low DC resistance ($0.44 m\Omega$) minimizes power loss due to heat, significantly increasing the efficiency of the power supply. * **Ferrite Core Material:** Provides low core losses at high switching frequencies, making it ideal for modern processors and high-speed data applications. * **Shielded Construction:** The closed magnetic path reduces Electromagnetic Interference (EMI), preventing the inductor from affecting nearby sensitive components. --- ### 4. Typical Applications This inductor is commonly found in power management circuits for: 1. **Server and Networking Equipment:** Powering high-performance CPUs and GPUs. 2. **Voltage Regulator Modules (VRMs):** Multi-phase power stages. 3. **Point of Load (POL) Converters:** Providing stable voltage rails for FPGAs and ASICs. 4. **Desktop and Notebook Motherboards:** Handling high-current transient loads.