The **FP1105R1-R12-R** is a high-current, non-isolated inductor part of the **FP1105 series** manufactured by Eaton (formerly Cooper Bussmann). It is specifically designed for high-frequency voltage regulator modules (VRMs) and DC-DC converters. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 120 nH (0.12 µH) | | **Tolerance** | ±10% | | **Saturation Current ($I_{sat}$)** | 63 Amperes | | **RMS Current ($I_{rms}$)** | 43 Amperes | | **DC Resistance (DCR)** | 0.46 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Breakdown of the Part Number The alphanumeric code provides specific details about the component's build: * **FP1105**: The series name (High frequency, high current power inductors). * **R1**: Revision or internal designator for the mechanical footprint. * **R12**: The Inductance value ($R12 = 0.12 \mu H$). * **-R**: RoHS compliant. --- ### 3. Core Features and Benefits #### High Power Density The FP1105 series uses a **ferrite core material**, which allows for low core losses at high frequencies. This makes it ideal for modern processors that require rapid power delivery. #### Low DCR (Direct Current Resistance) With a DCR of only **0.46 mΩ**, this part minimizes energy loss as heat. This increases the overall efficiency of the power supply and reduces the need for extensive cooling. #### Vertical Design The "1105" physical size (approx. 11.0mm x 8.0mm x 4.9mm) is optimized for a small PCB footprint while maintaining the ability to handle over 60 Amps of peak current. --- ### 4. Common Applications * **Multi-phase buck regulators:** Used in servers and workstations to power CPUs and GPUs. * **Voltage Regulator Modules (VRM):** Desktop and laptop power stages. * **Data Storage:** Powering high-speed SSD controllers and enterprise storage arrays. * **Point-of-Load (POL):** High-current DC-DC converters. ---