### Technical Overview of FP4-150-R The **FP4-150-R** is a high-frequency, high-current power inductor belonging to the **FP4 Series** manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). These inductors are specifically designed for multi-phase voltage regulator modules (VRMs) and high-density power converters. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Inductance** | 150 nH (0.150 µH) | | **Tolerance** | ±10% | | **DC Resistance (DCR)** | ~0.35 mΩ (Max) | | **Saturation Current ($I_{sat}$)** | ~72 A to 90 A (depending on temp) | | **RMS Current ($I_{rms}$)** | ~50 A | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | ~11.0 x 8.0 x 7.5 mm | --- ### 2. Physical Construction The "FP" in the series stands for **Flat-Pac**. The component is built using a ferrite core material characterized by: * **Low Core Loss:** Optimized for high-frequency switching (up to 2 MHz). * **Vertical Mount Design:** The "R" suffix typically denotes a RoHS-compliant, surface-mount (SMT) package with a vertical orientation to minimize the PCB footprint. * **Integrated Lead Frame:** The leads are part of a robust frame that provides high mechanical stability and low resistance. --- ### 3. Electronic Characteristics and Behavior * **High Saturation:** The inductor is designed to handle high peak currents without the inductance dropping off sharply. This is critical for preventing circuit failure during transient load spikes. * **Low DCR:** With a DC resistance in the sub-milliohm range, the part minimizes $I^2R$ power losses, ensuring high efficiency in power delivery. * **Frequency Range:** It is optimized for high-speed Point-of-Load (PoL) converters used in modern CPUs, GPUs, and ASICs. --- ### 4. Common Applications Due to its high current density and low profile, the FP4-150-R is primarily used in: 1. **Multi-phase Buck Converters:** Found on server motherboards and graphics cards. 2. **Voltage Regulator Modules (VRM):** Converting 12V inputs to low-voltage, high-current outputs (e.g., 0.8V - 1.8V). 3. **Data Center Infrastructure:** Powering high-end networking equipment and storage arrays. --- ### 5. Part Number Breakdown ```text FP 4 - 150 - R | | | | | | | +-- RoHS Compliant | | +------- Inductance Value (150nH) | +------------ Size/Series Designator +-------------- Flat-Pac Series ```