The **FP0807R1-R12-R** is a high-performance, high-current power inductor typically used in multi-phase voltage regulator modules (VRMs). It belongs to the FP0807R1 series manufactured by **Eaton (formerly Cooper Bussmann)**. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 120 nH (0.12 µH) | | **Tolerance** | ±10% | | **Saturation Current ($I_{sat}$)** | ~61 Amperes | | **RMS Current ($I_{rms}$)** | ~53 Amperes | | **DC Resistance (DCR)** | 0.42 mΩ (Max) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | SMD (approx. 8.2mm x 7.4mm x 7.0mm) | --- ### 2. Breakdown of the Part Number The alphanumeric code provides specific details about the component's construction: * **FP0807**: Series designation (refers to the physical footprint, roughly 8x7mm). * **R1**: Revision or internal designator for the specific core material/structure. * **R12**: Represents the inductance value. `R` acts as a decimal point, so `R12` = 0.12 µH (120 nH). * **-R**: Indicates compliance with **RoHS** (Lead-free). --- ### 3. Features and Applications #### Features * **High Frequency Performance:** Optimized for switching frequencies up to several MHz. * **Low DCR:** The extremely low DC resistance (0.42 mΩ) minimizes power loss and heat generation. * **Flat-Wire Construction:** Uses a rectangular copper wire to maximize current density and minimize "skin effect" at high frequencies. * **Magnetic Shielding:** Ferrite core construction reduces Electromagnetic Interference (EMI). #### Applications * **Computing:** Powering CPUs and GPUs in servers and workstations. * **Networking:** DC-DC converters for switches, routers, and base stations. * **VRMs:** High-current Multi-phase Buck converters. --- ### 4. Footprint and Mounting The device is a **Surface Mount Device (SMD)**. It features a "two-pad" design on the bottom, often referred to as a power bead inductor. Because of its high mass, proper solder paste volume is critical during PCB assembly to ensure mechanical stability under vibration.