The **FP1107R1-R12-R** is a high-current, non-isolated inductor typically used in multi-phase voltage regulator modules (VRMs). It is manufactured by Eaton (formerly Cooper Bussmann/Coiltronics) and belongs to the **FP1107 series** of Flat-Pac™ power inductors. ### 1. Technical Specifications The following table highlights the primary electrical and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance ($L$)** | 120 nH (0.12 µH) | | **Tolerance** | ±10% | | **Full Part Number** | FP1107R1-R12-R | | **Rated Current ($I_{rms}$)** | 61 Amps | | **Saturation Current ($I_{sat}$)** | 70 Amps (at 25°C) | | **DC Resistance ($DCR$)** | 0.29 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD) | | **Size / Dimension** | 11.0mm x 7.2mm x 7.5mm | --- ### 2. Key Features and Construction * **High Current Density:** Designed to handle very high saturation currents relative to its footprint, making it ideal for modern high-power CPUs and GPUs. * **Ferrite Core Material:** Utilizes a ferrite core which ensures low core losses at high switching frequencies. * **Low DCR:** The extremely low DC resistance (0.29 mΩ) minimizes power dissipation ($P = I^2R$) and improves overall system efficiency. * **Vertical Format:** The "1107" designation refers to the physical footprint, designed for vertical airflow and space-saving on dense PCBs. --- ### 3. Application Use Cases This specific inductor is found in high-performance power delivery circuits, including: 1. **Multi-phase Buck Converters:** Used in the VRM stages of motherboards and server cards. 2. **Voltage Regulator Modules (VRM):** Specifically for point-of-load (POL) applications. 3. **Data Center Infrastructure:** Powering high-end networking equipment and storage systems. 4. **Graphics Cards (GPUs):** Handling the rapid transient current demands of high-end processing units. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variations: * **FP1107**: Series designation (Flat-Pac, size 11mm x 7mm). * **R1**: Revision or internal design code. * **R12**: Inductance value ($R$ acts as a decimal point; $0.12 \mu H$). * **-R**: RoHS compliant. ---