The **MPI4040R4-1R0-R** is a high-performance, power inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the MPI (Molded Powder Inductor) series, which is designed for high-current power applications where space is limited and efficiency is critical. --- ### ## Technical Specifications The following table outlines the key electrical and physical parameters of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 1.0 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 8.0 A (Typical temperature rise 40°C) | | **Saturation Current (Isat)** | 10.0 A (Typical 30% drop in inductance) | | **DC Resistance (DCR)** | 11.5 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 4.0mm x 4.0mm x 4.0mm (1515 Metric) | | **Shielding** | Shielded (Magnetic Resin Molded) | --- ### ## Key Features & Construction 1. **Molded Powder Technology:** The inductor is constructed using a composite powdered iron core material. This process results in a "soft saturation" characteristic, meaning the inductance decreases gradually as current increases, rather than dropping sharply. 2. **High Power Density:** The "4040" footprint indicates a compact 4mm x 4mm size. Despite the small footprint, it can handle significant current (up to 10A peak) due to its low DCR and efficient thermal design. 3. **Low EMI:** Because the winding is fully encapsulated in a magnetic metal powder resin, the part is naturally shielded. This minimizes electromagnetic interference (EMI) with neighboring components on the PCB. 4. **Ruggedness:** The molded construction provides excellent resistance to mechanical shock and vibration, making it suitable for automotive and industrial environments. --- ### ## Typical Applications This component is primarily used in DC-DC converters and power management modules. Common use cases include: * **Mobile Devices:** Smartphones, tablets, and handheld consoles. * **Computing:** Point-of-Load (POL) converters for CPUs and GPUs. * **Battery Powered Systems:** Efficiency-critical power supplies for IoT devices. * **Automotive Infotainment:** Powering displays and sensors where low EMI is required. --- ### ## Part Number Breakdown `MPI 4040 R4 - 1R0 - R` * **MPI:** Series Name (Molded Powder Inductor) * **4040:** Physical size (approx. 4.0 x 4.0mm) * **R4:** Height code (approx. 4.0mm max) * **1R0:** Inductance value (1.0 microhenries) * **-R:** RoHS compliant suffix