The **MPI4040R3-220-R** is a high-performance, power inductor manufactured by **Eaton (formerly Coiltronics)**. It belongs to the MPI (Molded Powder Inductor) series, which is specifically designed for high-density power applications. --- ### 1. Technical Specifications The following table summarizes the core electrical and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 22 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 225 mΩ (Typical) | | **Saturation Current ($I_{sat}$)** | 2.5 A | | **RMS Current ($I_{rms}$)** | 2.0 A | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 4.7mm x 4.31mm x 3.0mm | | **Shielding** | Magnetically Shielded | --- ### 2. Key Features and Construction The MPI series is known for its "rugged" build quality, focusing on efficiency and space-saving. * **Molded Construction:** The inductor is made by molding a metal powder around the coil. This process eliminates the "air gap" found in traditional ferrite cores, resulting in a **soft saturation** characteristic (the inductance drops gradually rather than abruptly as current increases). * **Magnetic Shielding:** The molded powder body acts as a natural shield, significantly reducing Electromagnetic Interference (EMI), which is critical for sensitive dense PCBs. * **High Power Density:** Its 4040 footprint (approx. 4mm x 4mm) provides a high current-carrying capacity relative to its small physical size. * **Low Core Loss:** Optimized for high-frequency switching regulators. --- ### 3. Common Applications Due to its 22 µH inductance and 2.5 A saturation current, this part is typically used in the following circuits: 1. **DC-DC Converters:** Buck, boost, and SEPIC converters in handheld or battery-powered devices. 2. **Point of Load (POL):** Voltage regulation for CPUs, FPGAs, and ASICs. 3. **LED Drivers:** Providing stable current for high-brightness LEDs. 4. **Smart Home/IoT:** Power management modules for sensors and controllers where space is limited. --- ### 4. Part Number Breakdown Understanding the Eaton nomenclature: * **MPI:** Series name (Molded Powder Inductor). * **4040:** Physical size (4.7mm x 4.3mm). * **R3:** Revision or specific sub-series (High profile/Standard). * **220:** Inductance value code (22 followed by 0 zeros = **22 µH**). * **-R:** RoHS compliant.