The **FP1005R3-R08-R** is a high-performance, high-current power inductor typically used in multi-phase voltage regulator modules (VRMs). It is part of the FP1005 series manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). --- ### ## Technical Specifications The part number follows a specific nomenclature to describe its physical and electrical characteristics. | Parameter | Specification | | :--- | :--- | | **Inductance** | 85 nH (Nanohenries) | | **Tolerance** | ±10% | | **Rated Current (Irms)** | 53 A | | **Saturation Current (Isat)** | 85 A (at 25°C) | | **DC Resistance (DCR)** | 0.290 mΩ (0.00029 Ohms) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 10.2 x 7.0 x 4.95 mm | --- ### ### Key Features and Construction 1. **High Current Handling:** Due to its very low DCR (Direct Current Resistance), it can handle massive amounts of current with minimal power loss through heat. 2. **Ferrite Core Material:** This material ensures low core losses at high switching frequencies, making it ideal for modern power converters. 3. **Flat-Wire Construction:** The internal winding uses flat copper wire rather than round wire, which maximizes the cross-sectional area and reduces the "skin effect" at high frequencies. 4. **SMD Design:** The "R3" footprint is a Surface Mount Device (SMD) design specifically optimized for automated pick-and-place assembly. --- ### ### Application Use Cases This specific inductor is found in high-density power environments where efficiency and space are critical: * **Computing:** CPU and GPU Voltage Regulator Modules (VRMs) in servers and workstations. * **Networking:** Routers, switches, and high-end base stations. * **Graphics Cards:** Powering high-wattage GPUs (NVIDIA/AMD). * **DC-DC Converters:** Point-of-Load (POL) modules for industrial applications. --- ### ### Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **FP1005** | Product Series (Footprint: ~10mm x 7mm) | | **R3** | Version/Footprint Variation | | **R08** | Inductance value (R08 = 0.085µH or 85nH) | | **R** | RoHS compliant / Tape & Reel packaging |