The **FP3-100-R** is a high-frequency, high-current power inductor part of the FP3 series manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. These components are primarily designed for use in multi-phase regulators and high-density DC-DC converters. --- ### 1. Key Technical Specifications The FP3-100-R is a "flat-pac" power inductor known for its low profile and high efficiency. | Parameter | Specification | |:---|:---| | **Inductance (OCL)** | 100 nH (0.10 µH) ±10% | | **Rated Current ($I_{rms}$)** | 35 Amps | | **Saturation Current ($I_{sat}$)** | 60 Amps | | **DC Resistance (DCR)** | 0.55 mΩ (Nominal) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 7.2 x 6.7 x 3.0 mm | --- ### 2. Core Electronic Characteristics #### A. Low DCR (Direct Current Resistance) The internal structure utilizes a flat copper wire design. This minimizes the resistance to direct current, which reduces power loss through heat (I²R losses), making it ideal for high-efficiency power supplies. #### B. High Saturation Current ($I_{sat}$) The "100" in the part number refers to the 100nH inductance. At 60A, the material maintains its magnetic properties without "saturating." If an inductor saturates, its inductance drops sharply, which can cause circuit failure. #### C. Ferrite Core Material The use of ferrite material ensures low core losses at high frequencies (up to 2 MHz). This allows engineers to design smaller power supplies that operate at higher switching speeds. --- ### 3. Physical Construction * **Surface Mount Device (SMD):** Designed for automated PCB assembly. * **Shielded Construction:** The closed magnetic path minimizes Electromagnetic Interference (EMI), preventing the inductor from interfering with nearby sensitive components. * **Lead-Free/RoHS Compliant:** The "-R" suffix indicates compliance with environmental standards and lead-free termination. --- ### 4. Typical Applications The FP3-100-R is commonly found in: * **Voltage Regulator Modules (VRMs):** Powering CPUs and GPUs in servers and workstations. * **Multi-phase Buck Converters:** Distributing high current across several parallel inductor stages. * **Point of Load (POL) Converters:** Providing stable power to FPGAs and ASICs.