## Technical Analysis of FP1107R1-R40-R The **FP1107R1-R40-R** is a high-current, shielded power inductor specifically designed for use in multi-phase Voltage Regulator Modules (VRMs) and DC-DC converters. It is manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). ### 1. Part Number Breakdown Understanding the nomenclature helps identify its specifications: | Segment | Meaning | Detail | | :--- | :--- | :--- | | **FP1107** | Series/Dimensions | Flat-Pac, 11.0mm x 7.2mm footprint | | **R1** | Version | Revision 1 | | **R40** | Inductance Value | R40 = 0.40 µH (400 nH) | | **-R** | Compliance | RoHS Compliant | --- ### 2. Key Specifications The electrical characteristics of this inductor are optimized for high-frequency efficiency and high power density. | Parameter | Value | | :--- | :--- | | **Inductance ($L_0$)** | 400 nH (0.40 µH) | | **Full Load Inductance** | 288 nH (at $I_{sat}$) | | **DC Resistance (DCR)** | 0.29 mΩ (Typical) | | **Saturation Current ($I_{sat}$)** | 61 Amps | | **RMS Current ($I_{rms}$)** | 51 Amps | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Core Technologies & Features * **Ferrite Core Material:** Unlike powdered iron cores, the ferrite core used in this series offers very low core losses at high switching frequencies (up to 2 MHz). * **Vertical Mount Design:** The "1107" package utilizes a vertical design that minimizes the PCB footprint while allowing for significant airflow between components, improving thermal management. * **Magnetic Shielding:** The closed magnetic path construction reduces Electromagnetic Interference (EMI), which is critical for sensitive computing environments. * **Low DCR:** With a resistance of only 0.29 mΩ, the "copper loss" (heat generated by the wire itself) is minimized, allowing for higher efficiency. --- ### 4. Typical Applications This component is most commonly found in high-performance power delivery systems: 1. **Server & Networking:** Powering high-end CPUs, GPUs, and ASICs. 2. **Voltage Regulator Modules (VRMs):** Used in multi-phase buck converters where multiple inductors are placed in parallel to provide hundreds of amps. 3. **Data Centers:** Point-of-Load (POL) modules and distributed power architectures. --- ### 5. Footprint Information * **Length:** 11.0 mm * **Width:** 7.2 mm * **Height:** 7.5 mm