The **FP1005R2-R12-R** is a high-performance, high-current power inductor typically used in multi-phase voltage regulator modules (VRMs). It belongs to the FP1005 series, which is characterized by its "flat-pac" construction and high power density. --- ### 1. Technical Specifications The part number follows a specific nomenclature. Below are the primary electrical and physical characteristics: | Parameter | Specification | | :--- | :--- | | **Inductance** | 120 nH (0.12 µH) | | **Tolerance** | ±10% | | **Saturation Current ($I_{sat}$)** | ~61 Amperes | | **DC Resistance (DCR)** | 0.17 mΩ (Nominal) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 10.2mm x 7.0mm x 4.95mm (SMD) | --- ### 2. Internal Construction and Materials The "FP" designation usually refers to a **Flat-Pac** design, which utilizes specific engineering choices to handle extreme currents: * **Core Material:** Typically uses a Ferrite core. Ferrite provides low core losses at high frequencies, which is essential for modern DC-DC converters switching at several hundred kHz to MHz. * **Winding:** Uses a flat-wire (ribbon) copper construction. This maximizes the cross-sectional area of the conductor within a small footprint, resulting in the ultra-low **DCR (0.17 mΩ)** mentioned above. * **Magnetics:** Designed with a "controlled saturation" characteristic, meaning the inductance stays relatively stable even as the current approaches the maximum rating. --- ### 3. Key Applications This specific inductor is designed for high-density power applications where space is limited but current requirements are high: 1. **Server and Networking:** Used in VRMs (Voltage Regulator Modules) for CPUs and GPUs in data centers. 2. **Point-of-Load (POL) Converters:** Providing stable power for FPGAs and ASICs. 3. **Multi-phase Buck Converters:** These inductors are often placed in parallel phases to provide 100A+ to a single processor. --- ### 4. Part Number Breakdown The suffixing follows Eaton/Bussmann standards: * **FP1005:** Series name (Dimensions: 10mm x 5mm height category). * **R2:** Revision/Version code for the internal structure. * **R12:** Inductance value (R = decimal point; 0.12 µH). * **-R:** RoHS compliant. ---