### Technical Overview of FP1005R3-R12-R The **FP1005R3-R12-R** is a high-performance, high-current power inductor manufactured by Eaton (formerly Cooper Bussmann). It belongs to the **FP1005 series**, which is widely used in low-voltage, high-current multi-phase voltage regulator modules (VRMs). --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 120 nH (0.12 µH) | | **Tolerance** | ±10% | | **DC Resistance (DCR)** | 0.29 mΩ (Typical) | | **Saturation Current ($I_{sat}$)** | 85 Amps | | **RMS Current ($I_{rms}$)** | 53 Amps | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 10.2mm x 7.0mm x 4.95mm | --- ### 2. Core Features & Materials * **Ferrite Core Material:** Unlike powder iron cores, the ferrite core used in this part offers very low core losses, making it highly efficient at high switching frequencies. * **Vertical Mount Design:** The "R3" designation often refers to the specific footprint and winding structure optimized for automated surface mount technology (SMT) assembly. * **Low DCR:** The exceptionally low DC resistance (0.29 mΩ) minimizes power dissipation through heat, which is critical for high-efficiency power supplies. * **High Frequency Performance:** Designed to operate efficiently in circuits with switching frequencies ranging from several hundred kHz up to over 2 MHz. --- ### 3. Application Areas This specific inductor is primarily found in high-density computing environments. Common applications include: 1. **Voltage Regulator Modules (VRM):** Used for CPUs, GPUs, and ASICs in servers and workstations. 2. **Point of Load (PoL) Converters:** Providing stable power to high-speed FPGAs. 3. **Data Centers:** Powering high-speed networking equipment and storage arrays. 4. **Multi-phase Buck Converters:** Used in parallel configurations to handle hundreds of Amperes of current. --- ### 4. Part Number Breakdown ```text FP 1005 R3 - R12 - R | | | | | | | | | └── RoHS Compliant | | | └─────── Inductance Value: R12 = 0.12µH (120nH) | | └──────────── Version / Series Revision | └───────────────── Physical Dimension (Approx. 10mm x 5mm) └───────────────────── High Current Inductor Family ``` ---