The **FP1105R1-R10-R** is a high-current, shielded drum core power inductor typically used in voltage regulator modules (VRMs) and DC-DC converters. It is manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 100 nH (0.10 µH) | | **Tolerance** | ±10% | | **Current Rating (Irms)** | 43 A | | **Saturation Current (Isat)** | 85 A | | **DC Resistance (DCR)** | 0.42 mΩ (Max) | | **Operating Temp Range** | -40°C to +125°C | | **Dimensions** | 11.0mm x 8.0mm x 4.9mm | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ### 2. Part Number Breakdown The nomenclature reveals the specific design features: * **FP1105**: The series designation (High frequency, high current power inductor). * **R1**: Revision level or specific internal design iteration. * **R10**: The inductance value. "R" acts as a decimal point, so R10 = 0.10 µH. * **R**: Indicates compliance (RoHS compliant). --- ### 3. Key Features and Applications #### Features * **High Power Density:** Optimized for high-frequency switching power supplies. * **Low DCR:** The extremely low DC resistance (0.42 mΩ) minimizes power loss and improves efficiency. * **Ferrite Core Material:** Provides stable performance over a wide temperature range with low core losses. * **Shielded Construction:** Reduces Electromagnetic Interference (EMI) to neighboring components. #### Common Applications * **Multi-phase VRMs:** Used in motherboards and servers to power CPUs and GPUs. * **DC-DC Converters:** High-efficiency point-of-load (POL) modules. * **Telecommunications:** Used in networking equipment and base stations. * **Computing:** Power supplies for laptop and desktop systems. --- ### 4. Footprint Example (Recommended Land Pattern) ```text [ 11.2 mm ] +---------------+ | _________ | | | PAD 1 | | (3.0mm width) | |_________| | | | (Gap approx 5.0mm) | _________ | | | PAD 2 | | | |_________| | +---------------+ ```