The **FP0906R1-R18-R** is a high-performance, high-current power inductor typically used in multi-phase voltage regulator modules (VRMs). It is manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)** as part of the FP0906 series. ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics: | Parameter | Value / Description | | :--- | :--- | | **Inductance ($L$)** | 180 nH (0.18 µH) | | **Tolerance** | ±10% | | **Rated Current ($I_{rms}$)** | ~53 Amperes | | **Saturation Current ($I_{sat}$)** | ~70 Amperes | | **DC Resistance (DCR)** | 0.29 mΩ (milliohms) typical | | **Operating Temp** | -40°C to +125°C | | **Package Size** | 9.1 x 6.2 x 6.0 mm (approx.) | --- ### 2. Key Features and Materials The FP0906 series is engineered for efficiency in demanding power environments: * **Flat-Pac™ Technology:** Uses a flat-wire construction which maximizes the surface area of the conductor, significantly reducing DC resistance and increasing current handling. * **Ferrite Core:** This material provides low core losses at high frequencies, making it ideal for high-speed switching power supplies. * **SMD Design:** Surface-mount device packaging suitable for automated pick-and-place assembly. * **Low Profile:** The "0906" designation indicates a relatively small footprint with a height of roughly 6mm, suitable for dense PCB layouts. --- ### 3. Common Applications Due to its high saturation current and extremely low DCR, this inductor is primarily found in: 1. **Server CPU Power:** Multi-phase buck converters for high-end processors (Intel/AMD). 2. **Graphics Cards (GPUs):** Handling the high-current demands of modern video cards. 3. **Data Centers:** Distributed power systems and point-of-load (POL) modules. 4. **Network Hardware:** High-speed routers and switches requiring stable voltage rails. --- ### 4. Part Number Breakdown The nomenclature `FP0906R1-R18-R` can be decoded as follows: * **FP:** Product Family (Flat-Pac). * **0906:** Physical dimensions (roughly 9mm x 6mm). * **R1:** Revision or internal series code. * **R18:** Inductance value (R = decimal point; 0.18 µH). * **-R:** RoHS compliant. ---