The **MPI4040R3-100-R** is a high-performance, shielded power inductor part of the MPI4040 series, commonly manufactured by Eaton (formerly Cooper Bussmann). These components are designed for high-power density applications where space is limited and efficiency is critical. --- ### ## Technical Specifications Below are the primary electrical and physical characteristics of the MPI4040R3-100-R: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 10.0 µH | | **Inductance Tolerance** | ±20% | | **DC Resistance (DCR) Typ.** | 135 mΩ | | **DC Resistance (DCR) Max.** | 158 mΩ | | **Rated Current ($I_{rms}$)** | 2.5 Amps | | **Saturation Current ($I_{sat}$)** | 3.5 Amps | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 4.7mm x 4.06mm (Height: 3.0mm max) | --- ### ## Key Features & Construction 1. **Molded Construction:** The inductor is built using a metal flakes powder molding process. This provides excellent magnetic shielding, which minimizes Electromagnetic Interference (EMI) with surrounding components on the PCB. 2. **Soft Saturation:** Unlike ferrite core inductors that have a sharp drop in inductance when current limits are exceeded, this series features a "soft" saturation characteristic. This makes the circuit more stable under transient load conditions. 3. **High Efficiency:** It is designed for low core losses and low DCR, which translates to less heat generation and higher energy efficiency in power conversion circuits. 4. **Ruggedness:** The molded design is robust against mechanical shock and vibration, making it suitable for automotive and industrial environments. --- ### ## Common Applications The MPI4040R3-100-R is typically found in the following electronic circuits: * **DC-DC Converters:** Used as a storage element in buck, boost, or buck-boost regulators. * **Mobile Devices:** Power management modules for tablets, laptops, and smartphones. * **IoT Devices:** Where compact size and high efficiency are required for battery longevity. * **Distributed Power Systems:** Point-of-Load (POL) regulation. --- ### ## Naming Convention Breakdown * **MPI4040**: The series name and physical footprint (approx. 4.0mm x 4.0mm). * **R3**: Refers to the version/height profile (in this case, 3.0mm max). * **100**: The inductance value code. `100` translates to $10 \times 10^0$ µH = **10 µH**. * **-R**: Indicates the part is RoHS compliant.