The **FP0708R1-R12-R** is a high-performance, high-current power inductor typically used in multi-phase voltage regulator modules (VRMs). It is part of the FP0708 series manufactured by **Eaton (formerly Bussmann/Coiltronics)**. --- ### 1. Technical Specifications The part number can be decoded to understand its specific electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Inductance ($L$)** | $0.120 \mu H$ ($120 nH$) | | **Full Load Current ($I_{sat}$)** | ~64 Amperes | | **DC Resistance ($DCR$)** | $0.42 m\Omega$ (Typical) | | **Operating Temperature** | $-40^{\circ}C$ to $+125^{\circ}C$ | | **Package/Case** | $7.0 \times 8.5 \times 7.2 mm$ (Vertical Mount) | | **Material** | Ferrite core with low core loss | --- ### 2. Part Number Breakdown The nomenclature follows a specific logic used by Eaton for power inductors: * **FP0708**: Series name (represents dimensions: approx 7mm x 8mm). * **R1**: Revision or manufacturing variation code. * **R12**: Inductance value ($R$ acts as decimal). $R12 = 0.12 \mu H$. * **-R**: RoHS compliant (lead-free). --- ### 3. Key Features & Applications This component is engineered for high-frequency power conversion where efficiency and space are critical. #### Applications: * **Computing:** Multi-phase Vcore regulators for CPUs and GPUs. * **Data Centers:** High-current DC-DC converters for servers and networking hardware. * **Voltage Regulator Modules (VRM):** Specifically designed for point-of-load (POL) applications. #### Advantages: 1. **Low DCR:** The exceptionally low DC resistance (measured in milliohms) minimizes power loss due to heat ($I^2R$ losses). 2. **Saturation Characteristics:** It maintains stable inductance even under high current surges, preventing circuit instability. 3. **High Frequency:** Optimized for switching frequencies ranging from several hundred kHz to over 2 MHz. --- ### 4. Footprint and Mounting The FP0708 series uses a **Surface Mount (SMT)** design with a specific vertical orientation. This "flat-pac" design allows for a smaller footprint on the PCB, which is vital for high-density power stages where multiple inductors are placed side-by-side.