### MPI4040R4-R22-R: Technical Overview The **MPI4040R4-R22-R** is a high-performance, shielded power inductor designed primarily for DC-DC converter applications. It belongs to the **MPI4040 series** manufactured by Eaton (formerly Cooper Bussmann). --- ### 1. Technical Specifications The part number encodes specific characteristics of the component. Below is the breakdown of its electrical and physical properties: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.22 µH (Microhenries) | | **Tolerance** | ±20% | | **Current Rating (Irms)** | ~17.5 A (Amperes) | | **Saturation Current (Isat)** | ~22.0 A | | **DC Resistance (DCR)** | ~2.5 mΩ (Milliohms) typical | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 4.7mm x 4.06mm x 4.0mm | | **Shielding** | Magnetically Shielded | --- ### 2. Key Features * **High Current Density:** Due to its metal-composite construction, it handles high saturation currents without a sharp drop in inductance. * **Low Core Loss:** Optimized for high-frequency switching power supplies. * **Magnetically Shielded:** The molded construction minimizes Electromagnetic Interference (EMI), making it suitable for densely packed PCBs. * **Rugged Construction:** Designed to handle high vibrations and thermal shocks. --- ### 3. Part Number Decoder Understanding the nomenclature helps in selecting alternatives or similar parts: * **MPI:** Series Name (Molded Power Inductor). * **4040:** Footprint dimensions (approx. 4.0mm x 4.0mm). * **R4:** Height code (approx. 4.0mm high). * **R22:** Inductance value (R22 = 0.22 µH). * **-R:** RoHS compliant. --- ### 4. Common Applications This inductor is typically used in power management stages where space is limited but current demand is high: 1. **Voltage Regulator Modules (VRMs):** Used in CPU/GPU power delivery. 2. **Point-of-Load (POL) Converters:** Providing stable power to FPGAs or ASICs. 3. **Battery Powered Devices:** High efficiency helps extend battery life in handheld electronics. 4. **Distributed Power Systems:** Used in DC-DC buck or boost converters.