The **MPI4040R4-220-R** is a high-performance, power inductor manufactured by **Eaton (formerly Coiltronics)**. It belongs to the MPI4040 series, which is specifically designed for high-current, low-profile power applications such as DC-DC converters and voltage regulator modules. --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of this component: | Parameter | Value | | :--- | :--- | | **Inductance** | 22 µH | | **Tolerance** | ±20% | | **Maximum DC Current (Irms)** | 1.8 Amperes | | **Saturation Current (Isat)** | 2.5 Amperes | | **DC Resistance (DCR)** | 184 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Dimensions (L x W x H)** | 4.7mm x 4.06mm x 4.0mm | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **MPI**: Series name (Molded Power Inductor). * **4040**: Case size (approx. 4.0mm x 4.0mm footprint). * **R4**: Revision or specific height profile (4.0mm). * **220**: Inductance value code (22 x 10^0 = **22 µH**). * **-R**: RoHS compliant. --- ### 3. Key Features & Construction * **Molded Construction:** The inductor is made using a metal powder molding process. This provides excellent shielding (low EMI) and high saturation characteristics compared to traditional ferrite drum cores. * **Soft Saturation:** Unlike standard inductors that drop inductance sharply when current limits are reached, the MPI series has a "soft" saturation curve, making the circuit more stable under peak loads. * **High Power Density:** Its compact 4040 footprint allows for high current handling in a small space, ideal for modern portable electronics. --- ### 4. Common Applications This part is typically found in: 1. **Distributed Power Systems:** Point-of-Load (POL) converters. 2. **Computing:** Laptops, servers, and solid-state drives (SSDs). 3. **Battery Powered Devices:** Handheld instruments and mobile peripherals. 4. **Voltage Regulator Modules (VRM):** Providing clean power to CPUs and GPUs. ---