The **MPI4040R4-1R5-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 applications where space is limited and efficiency is critical. --- ### 1. Technical Specifications The following table summarizes the key electrical and physical parameters of this component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 1.5 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 6.5 A (Typical) | | **Saturation Current (Isat)** | 10.0 A (Typical) | | **DC Resistance (DCR)** | 15 mΩ (Max) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 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**: Dimensions (approx. 4.0mm x 4.0mm footprint). * **R4**: Height code (approx. 4.0mm maximum height). * **1R5**: Inductance value (1.5 µH). * **-R**: RoHS compliant. --- ### 3. Key Features and Construction * **Molded Construction:** The inductor uses a metal powder core technology. The wire coil is placed inside a mold, and iron powder is pressed around it. This provides excellent magnetic shielding and reduces EMI (Electromagnetic Interference). * **High Current Density:** Due to the composite core material, it can handle high saturation currents without a sharp drop in inductance (soft saturation characteristic). * **Rugged Design:** The molded body protects the internal windings from mechanical stress and environmental factors. --- ### 4. Common Applications This part is typically found in the following electronic circuits: 1. **DC-DC Converters:** Used as an energy storage element in buck, boost, or SEPIC converters. 2. **Computing Hardware:** Powering CPUs, GPUs, and FPGAs in laptops or servers. 3. **Battery Powered Devices:** Ideal for smartphones and tablets where high efficiency and small size are required. 4. **LED Drivers:** Used in constant current circuits for lighting. --- ### 5. Schematic Symbol Usage In a circuit diagram, it is represented by a standard inductor symbol. In a PCB layout environment (like Altium or KiCad), it would be defined as: ```markdown Symbol: L Value: 1.5uH Footprint: IND_MPI4040_EATON ```