The **FP1105R1-R15-R** is a high-current, shielded drum core power inductor typically used in voltage regulator modules (VRMs) and DC-DC converters. It is part of the FP1105 series manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 0.15 µH (150 nH) | | **Tolerance** | ±10% | | **DC Resistance (DCR)** | 0.30 mΩ (Typical) | | **Saturation Current ($I_{sat}$)** | ~85 Amperes | | **RMS Current ($I_{rms}$)** | ~43 Amperes | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ### 2. Physical Characteristics * **Dimensions:** Approximately 11.0mm x 8.0mm x 4.9mm. * **Construction:** Ferrite core material with a "Flat-Pac" design. This design allows for a low profile while maintaining high power density. * **Shielding:** It is magnetically shielded, which minimizes Electromagnetic Interference (EMI) with surrounding components on the PCB. ### 3. Core Features and Benefits * **High Efficiency:** The extremely low DCR (Direct Current Resistance) minimizes power loss due to heat, making it ideal for high-efficiency power supplies. * **High Saturation:** It can handle significant current spikes without the inductance dropping off sharply, which is critical for protecting power stages in computing environments. * **Halogen Free:** Complies with environmental standards (RoHS compliant). ### 4. Typical Applications The FP1105 series is specifically engineered for high-speed, high-current applications such as: 1. **Multi-phase buck regulators:** Found in high-end PC motherboards and servers. 2. **Voltage Regulator Modules (VRM):** Specifically for CPU and GPU power delivery. 3. **Data Storage:** Powering SSD arrays and high-speed networking equipment. 4. **Point-of-Load (POL) Converters:** Decentralized power management on complex circuits. --- ### 5. Part Number Breakdown * **FP1105:** Series name (Flat-Pac, size 11x8mm). * **R1:** Revision or specific mechanical variation. * **R15:** Inductance value (R15 = 0.15 µH). * **-R:** RoHS compliant.