### Technical Overview of MPI4040R2-1R5-R The **MPI4040R2-1R5-R** is a high-performance, high-current power inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the MPI4040 series, which is characterized by its molded construction and metal flake core technology, providing excellent EMI shielding and efficiency. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 1.5 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 6.3 A | | **Saturation Current (Isat)** | 9.0 A | | **DC Resistance (DCR)** | 16 mΩ (Max) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 4.7mm x 4.06mm x 2.0mm | --- ### 2. Core Features and Construction The component is designed for modern, high-density power electronics. Its primary features include: * **Molded Construction:** The inductor is encased in a composite material that provides rugged environmental protection and suppresses acoustic noise. * **Magnetic Shielding:** The metal flake core structure inherently shields the component, reducing electromagnetic interference (EMI) with surrounding sensitive circuits. * **Soft Saturation:** Unlike traditional ferrite cores that lose inductance sharply, this part exhibits a "soft" saturation curve, meaning it retains inductance more effectively as current increases. * **Low DCR:** The low direct current resistance minimizes power loss due to heat, making it ideal for battery-operated devices. --- ### 3. Common Applications This inductor is typically found in DC-DC converters and power management modules for: 1. **Handheld Devices:** Smartphones, tablets, and wearable electronics. 2. **Computing:** Laptops, servers, and solid-state drives (SSDs). 3. **Point of Load (POL):** Voltage regulation modules (VRMs) near CPUs or FPGAs. 4. **Battery Powered Systems:** Where high efficiency and small footprint are critical. --- ### 4. Part Number Breakdown The nomenclature reveals specific details about the component's physical and electrical properties: | Segment | Meaning | | :--- | :--- | | **MPI** | Series Name (Miniature Power Inductor) | | **4040** | Physical Dimensions (Approx. 4.0mm x 4.0mm) | | **R2** | Height Code (2.0mm Max) | | **1R5** | Inductance Value (1.5 µH) | | **-R** | RoHS Compliant / Lead-Free |