The **FP1505R1-R12-R** is a high-current, shielded drum core power inductor manufactured by Eaton (formerly Bussmann/Coiltronics). It is part of the FP1505 series, specifically designed for high-frequency voltage regulator modules (VRMs) and multi-phase applications. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Inductance** | 120 nH (0.12 µH) | | **Tolerance** | ±10% | | **Current Rating ($I_{rms}$)** | 65 Amps (Temperature rise base) | | **Saturation Current ($I_{sat}$)** | 88 Amps (Inductance drop base) | | **DC Resistance (DCR)** | 0.21 mΩ (typical) | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Physical Characteristics The FP1505 series is known for its "Flat-Pac" design, which optimizes high power density in a small footprint. * **Dimensions:** Approximately 15.0mm x 5.0mm x 5.0mm. * **Core Material:** Ferrite core, which provides low core losses at high frequencies. * **Construction:** Shielded construction to minimize Electromagnetic Interference (EMI) with neighboring components. --- ### 3. Applications This inductor is typically found in high-performance computing environments where stable, high-current power delivery is critical. * **Voltage Regulator Modules (VRM):** Used in servers and workstations to step down voltage for CPUs and GPUs. * **Multi-phase Buck Converters:** Ideal for high-current DC-DC converters where multiple inductors work in parallel. * **Point-of-Load (POL) Converters:** Providing power to FPGAs and ASICs. * **High-density Power Supplies:** Used in telecommunications and data centers. --- ### 4. Part Number Breakdown The nomenclature `FP1505R1-R12-R` can be decoded as follows: * **FP1505:** Series name (Flat-Pac, size 15x5mm). * **R1:** Revision or internal designator. * **R12:** Inductance value (R = decimal point; 0.12 µH). * **-R:** RoHS compliant. --- ### 5. Schematic Representation In a circuit diagram, the part is represented as a standard inductor with its specific values: ```spice * SPICE model placeholder L1 Net_In Net_Out 0.12uH RS 1 2 0.00021 ; DCR in Ohms ```