The **MPI4040R1-R22-R** is a high-performance, shielded power inductor typically manufactured by Eaton (formerly Coiltronics/Bussmann). It belongs to the MPI4040 series, which is known for its high current handling and compact footprint. --- ## 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics. | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.22 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 4.3 mΩ (Typical) / 5.2 mΩ (Max) | | **Saturation Current ($I_{sat}$)** | 22 Amps | | **RMS Current ($I_{rms}$)** | 11.5 Amps | | **Operating Temperature** | -40°C to +125°C | | **Dimensions (L x W x H)** | 4.7mm x 4.06mm x 1.2mm | --- ## 2. Key Features and Materials ### Construction * **Molded Metal Powder:** The inductor is made from a composite metal powder core. This design allows for "soft saturation," meaning the inductance drops gradually as current increases rather than failing abruptly. * **Magnetic Shielding:** The molded construction inherently provides EMI (Electromagnetic Interference) shielding, making it ideal for densely packed circuit boards. * **Rugged Design:** The part is designed to handle high-frequency noise and high transient current spikes. ### Physical Footprint * The **"4040"** refers to the package size (approx. 4.0mm x 4.0mm). * The **"R1"** suffix indicates the height profile (in this case, a very low profile of ~1.2mm). --- ## 3. Common Applications Due to its low DCR and high saturation current in a small package, the MPI4040R1-R22-R is commonly used in: 1. **DC-DC Converters:** Point-of-Load (POL) converters for CPUs and GPUs. 2. **Mobile Electronics:** Smartphones and tablets where vertical space is limited. 3. **Battery Powered Systems:** Where high efficiency (low energy loss via DCR) is critical. 4. **Distributed Power Systems:** Used in telecommunications and industrial computing. --- ## 4. Equivalent Part Comparison If this specific part is unavailable, engineers often look for these alternatives in the 4040 (Metric 4040 or Imperial 1616) footprint: * **Vishay:** IHLP-1616 Series. * **TDK:** SPM4012 Series. * **Bourns:** SRP4012 Series.