The **FP1208R1-R18-R** is a high-current, shielded drum core power inductor typically used in voltage regulator modules (VRMs) and high-density power applications. It is manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 180 nH (0.18 µH) | | **Tolerance** | ±10% | | **Current Rating (Irms)** | 55 Amps | | **Saturation Current (Isat)** | 85 Amps | | **DC Resistance (DCR)** | 0.29 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 12.1mm x 8.0mm x 8.0mm (Surface Mount) | --- ### Key Features and Design #### 1. High Current Density This part is designed specifically for **multi-phase buck converters**. Because of its exceptionally low DCR (Direct Current Resistance), it minimizes power loss and heat generation even when carrying currents up to 55A. #### 2. Ferrite Material The "FP" series uses a ferrite core material. This ensures: * Low core losses at high frequencies. * A "hard" saturation characteristic (where inductance drops quickly once the saturation current is exceeded). #### 3. Construction (Flat-Pac™) The 1208 size designation refers to the dimensions (approx. 12mm length, 8mm height). The "R1" indicates a specific version of the internal winding or core configuration optimized for high-frequency switching. --- ### Common Applications * **Computing:** CPU/GPU Voltage Regulator Modules (VRMs) in servers and workstations. * **Data Centers:** High-current Point-of-Load (PoL) converters. * **Networking:** Routers, switches, and base station power supplies. * **Graphics Cards:** Power delivery for high-performance GPUs. --- ### Understanding the Part Number `FP1208R1-R18-R` * **FP1208:** Family series and physical size (12mm x 8mm). * **R1:** Revision or internal variation code. * **R18:** Inductance value (R18 = 0.18 µH). * **-R:** RoHS compliant / Lead-free.