The **FP3-1R5-R** is a high-frequency, high-current power inductor designed by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the FP3 series, which is known for its flat-pac, surface-mount design. --- ### 1. Key Technical Specifications The following table outlines the core electrical characteristics of the component: | Parameter | Value | | :--- | :--- | | **Inductance** | 1.5 µH (Microhenries) | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 5.5 Amperes | | **Saturation Current (Isat)** | 8.0 Amperes | | **DC Resistance (DCR)** | 14.5 mΩ (Max) | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | SMD (Surface Mount Device) | --- ### 2. Physical Design and Construction The "FP" in the part number stands for **Flat-Pac**. This series uses a unique construction style: * **Core Material:** Ferrite core material, which provides low core losses at high frequencies. * **Winding:** It features a flat-wire or "ribbon" winding. This minimizes "skin effect" losses and allows for a lower profile (height) while maintaining high current capacity. * **Shielding:** It is magnetically shielded, which reduces Electromagnetic Interference (EMI) with surrounding components. --- ### 3. Application Use-Cases The FP3-1R5-R is typically used in power management circuits where space is limited and efficiency is critical. Common applications include: * **DC-DC Converters:** Used as the storage inductor in Buck, Boost, or SEPIC converters. * **Voltage Regulator Modules (VRMs):** Found in servers and high-performance computing to regulate CPU/GPU power. * **Portable Electronics:** Laptops and tablets where a low-profile component is required. * **Filtering:** Used in input/output filters to smooth out ripple current. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in selecting variants: ```text FP3 - 1R5 - R | | | | | +-- RoHS Compliant | +-------- Inductance Value (1.5 µH) +-------------- Series Name (Flat-Pac Size 3) ```