The **MPI4040R2-1R0-R** is a high-performance, power inductor manufactured by **Eaton (formerly Coiltronics)**. It belongs to the MPI (Miniature Power Inductor) series, specifically designed for high-current, space-constrained applications like mobile devices and DC-DC converters. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 1.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 14.5 mΩ (typical) / 17.5 mΩ (max) | | **Saturation Current ($I_{sat}$)** | 10.0 Amperes | | **RMS Current ($I_{rms}$)** | 7.7 Amperes | | **Package Size** | 4040 (4.7mm x 4.06mm) | | **Height** | 2.0 mm (Maximum) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Physical and Material Characteristics * **Construction:** It uses a **molded metal powder** construction. This composite core material provides "soft saturation" characteristics, meaning the inductance drops gradually as current increases rather than dropping sharply. * **Shielding:** The part is magnetically shielded. This minimizes Electromagnetic Interference (EMI), which is critical for densely packed circuit boards. * **Terminations:** It features lead-free, RoHS-compliant solder pads designed for surface mount (SMT) assembly. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **MPI:** Series Name (Miniature Power Inductor). * **4040:** Footprint dimensions (approx. 4.0mm x 4.0mm). * **R2:** Profile height (2.0mm max). * **1R0:** Inductance value (1.0 microhenries). * **-R:** RoHS compliant suffix. --- ### 4. Typical Applications Because of its high current handling and low profile, the MPI4040R2-1R0-R is commonly found in: 1. **Voltage Regulator Modules (VRM):** Used in laptops and servers. 2. **DC-DC Converters:** Point-of-load (POL) power supplies. 3. **Handheld Devices:** Smartphones, tablets, and portable gaming consoles. 4. **Battery Powered Systems:** Where high efficiency and low DCR (power loss) are required.