The **FP4-200-R** is a high-frequency, high-current power inductor typically manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the **FP4 series**, which is designed for multi-phase voltage regulator modules (VRMs) and high-density power applications. --- ### ## Technical Specifications The part number `FP4-200-R` can be broken down to understand its primary characteristics. | Parameter | Specification | Description | | :--- | :--- | :--- | | **Inductance** | 200 nH (0.20 µH) | Measured at 0Adc | | **Current Rating ($I_{rms}$)** | ~37 Amps | The continuous current the part can handle | | **Saturation Current ($I_{sat}$)** | ~50 - 70 Amps | The point where inductance drops by 20% | | **DC Resistance (DCR)** | ~0.45 mΩ | Extremely low to minimize power loss | | **Operating Temp** | -40°C to +125°C | Standard industrial range | | **Package/Footprint** | SMT (Surface Mount) | Low profile, high-density design | --- ### ## Internal Construction and Materials The "FP" stands for **Flat-Pac™**, indicating its physical construction: 1. **Core Material:** Uses a high-frequency Ferrite core material. This ensures very low core losses, making it efficient for switching frequencies up to **2 MHz**. 2. **Winding:** Features a "flat-wire" or "foil" winding. Unlike round wire, flat wire increases the surface area, which reduces the **Skin Effect** at high frequencies and allows for a lower DCR. 3. **Shielding:** The construction is naturally shielded, which helps contain Electromagnetic Interference (EMI) within the component. --- ### ## Key Features * **High Efficiency:** Due to the sub-milliohm DCR, it generates very little heat even at high currents. * **Small Footprint:** Designed to save "real estate" on the PCB, crucial for modern motherboards and servers. * **Vertical Integration:** Often used in "stacked" or multi-phase configurations to provide hundreds of amps to CPUs or GPUs. --- ### ## Typical Applications The FP4-200-R is commonly found in high-performance computing environments: * **Servers:** Voltage Regulator Modules (VRMs) for Intel and AMD processors. * **Graphics Cards (GPUs):** Providing stable current for high-end gaming and AI chips. * **Data Centers:** Distributed power systems and DC-DC converters. * **Network Equipment:** High-speed routers and switches.