The **FP1108L1-R120-R** is a high-current, low-profile power inductor typically used in voltage regulator modules (VRMs) and DC-DC converters. It belongs to the **FP1108 Series** manufactured by Eaton (formerly Cooper Bussmann). --- ### 1. Technical Specifications The following table summarizes the primary electrical and physical characteristics of this component: | Parameter | Value | | :--- | :--- | | **Inductance (L)** | 120 nH (0.12 µH) | | **Tolerance** | ±10% | | **Saturation Current ($I_{sat}$)** | ~85 A to 100 A (typical) | | **RMS Current ($I_{rms}$)** | ~64 A | | **DC Resistance (DCR)** | 0.29 mΩ (0.00029 Ohms) | | **Package/Footprint** | 11.0mm x 8.0mm x 8.0mm | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Material Core** | Ferrite | --- ### 2. Key Features * **High Current Density:** Designed to handle extremely high peak currents (up to 100A) without saturating quickly. * **Low DCR:** The ultra-low direct current resistance minimizes power loss and heat generation, which is critical for high-efficiency power supplies. * **Flat-Wire Construction:** Uses a flat copper wire design which reduces "skin effect" losses and allows for a more compact physical size. * **Ferrite Core:** Provides stable performance over a wide range of temperatures and frequencies. --- ### 3. Application Use Cases This specific inductor is found in high-performance computing environments where high amperage and low voltage are required. 1. **Server CPU Power:** Multi-phase VRMs for Intel and AMD processors. 2. **Graphics Cards (GPUs):** High-end power delivery for gaming and AI accelerators. 3. **Data Centers:** High-current DC-DC converters and Point-of-Load (PoL) modules. 4. **Networking:** High-speed routers and switches. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **FP1108:** The series designation (refers to the 11mm x 8mm footprint). * **L1:** Designates the specific internal construction/winding style. * **R120:** Represents the inductance value (R = decimal point; 120 = 0.120 µH). * **-R:** Indicates RoHS compliance.