## Technical Overview of FP0705R3-R18-R The **FP0705R3-R18-R** is a high-frequency, high-current power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the **FP0705 series**, which is designed specifically for multi-phase voltage regulator modules (VRMs) and high-density power applications. ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 180 nH (0.18 µH) | | **Tolerance** | ±10% | | **Saturation Current ($I_{sat}$)** | ~53 Amps (at 25°C) | | **RMS Current ($I_{rms}$)** | ~43 Amps | | **DCR (DC Resistance)** | 0.25 mΩ (Nominal) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | Surface Mount (7.0mm x 7.0mm x 4.95mm) | --- ### 2. Composition and Design The component utilizes a **Flat-Pac™** construction, which offers several mechanical and electrical advantages: * **Core Material:** Typically uses a Ferrite core material characterized by very low core losses at high switching frequencies (up to 2 MHz). * **Winding:** Features a flat-wire copper conductor. This design reduces the **Skin Effect** and lowers the DC resistance (DCR), which minimizes heat generation. * **Shielding:** It is a magnetically shielded construction, which reduces Electromagnetic Interference (EMI) with surrounding components on the PCB. --- ### 3. Part Number Breakdown Understanding the nomenclature helps identify variations within the series: | Segment | Meaning | | :--- | :--- | | **FP** | Product Family (Flat-Pac) | | **0705** | Dimensions (Approx. 7.0 x 5.0 mm footprint) | | **R3** | Revision or version code | | **R18** | Inductance value (R18 = 0.18 µH) | | **-R** | RoHS compliant / Lead-free | --- ### 4. Typical Applications Due to its high current handling and low profile, this part is commonly found in: * **Servers and Data Centers:** Powering CPUs, GPUs, and ASICs. * **Voltage Regulator Modules (VRMs):** Specifically multi-phase buck converters. * **Point-of-Load (PoL) Converters:** Providing stable power to high-speed digital circuits. * **Networking Equipment:** High-end routers and switches. --- ### 5. Footprint and Mounting (Code Example) While this is a physical component, EDA software (like Altium or KiCad) represents it via footprints. A simplified landing pattern description: ```markdown Land Pattern Dimensions (approximate): - Pad Width: 1.50 mm - Pad Length: 2.20 mm - Distance between pads: 3.50 mm - Overall footprint area: 7.2 mm x 7.2 mm ```