The **FP1008R5-R300-R** is a high-current, low-profile power inductor typically used in multi-phase voltage regulator modules (VRMs). It is part of the FP1008 series manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. --- ### 1. Component Overview The "FP" designation refers to **Flat-Pac**, a series designed for high-frequency switching applications where space is limited and current demands are high. | Feature | Specification | | :--- | :--- | | **Inductance** | 300 nH (0.30 µH) | | **Tolerance** | ±10% | | **Saturation Current ($I_{sat}$)** | ~55 Amps (at 25°C) | | **RMS Current ($I_{rms}$)** | ~50 Amps | | **DC Resistance (DCR)** | ~0.17 mΩ (typical) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 10.2 x 8.0 x 8.0 mm (approx.) | --- ### 2. Key Technical Attributes #### A. High Current Handling The inductor is built with a ferrite core material that provides high saturation characteristics. This means it can handle large surges of current (up to 55A) without the inductance dropping significantly, which is critical for preventing circuit instability. #### B. Ultra-Low DCR The **Direct Current Resistance (DCR)** is extremely low (measured in milliohms). This minimizes power loss due to heat (I²R loss), making the component highly efficient in high-density power designs. #### C. Ferrite Core Construction Unlike powdered iron cores, the ferrite core in this model offers: * Lower core losses at high frequencies. * Stable performance across a wide temperature range. * Fast transient response. --- ### 3. Part Number Breakdown The nomenclature for this part is structured as follows: | Segment | Meaning | | :--- | :--- | | **FP1008** | Product Series and Physical Size (approx 10x8 mm) | | **R5** | Revision or variation code | | **R300** | Inductance value (R300 = 0.300 µH) | | **-R** | RoHS compliant / Lead-free | --- ### 4. Common Applications This inductor is most frequently found in: * **Server & Data Centers:** Multi-phase buck converters for CPUs and GPUs. * **Voltage Regulator Modules (VRM):** Converting 12V bus voltage to low-voltage, high-current CPU rails. * **Networking Equipment:** High-speed routers and switches. * **Point-of-Load (POL) Converters:** Distributed power architectures. --- ### 5. Footprint (Example) While specific PCB layouts depend on the manufacturer's datasheet, the physical mounting usually follows a surface-mount (SMD) pattern: ```text [ Pad 1 ] +-------------+ | | | 10.2mm | (Body Width) | | +-------------+ [ Pad 2 ] ```