The **MPI4040R1-1R5-R** is a high-performance, power inductor manufactured by **Eaton (formerly Coiltronics)**. It belongs to the MPI (Miniature Power Inductor) series, designed specifically for high-current applications in compact electronic devices. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 1.5 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 18 mΩ (Typical) / 21 mΩ (Maximum) | | **Saturation Current (Isat)** | 9.5 Amperes | | **RMS Current (Irms)** | 6.8 Amperes | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 4.7mm x 4.06mm (Height: 1.2mm or 1.5mm) | --- ### 2. Component Composition & Design The "MPI" series features a unique construction that sets it apart from standard wire-wound inductors: * **Molded Construction:** It uses a metal flake powder core material. This molded design provides excellent magnetic shielding, reducing Electromagnetic Interference (EMI) with surrounding components. * **High Power Density:** Because of the composite core, it can handle high transient current spikes without reaching hard saturation (the inductance drops gracefully rather than abruptly). * **Ruggedness:** The solid molded body offers superior resistance to mechanical shock and vibration. --- ### 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). * **R1:** Revision or specific height profile (R1 indicates a low profile). * **1R5:** Inductance value (1.5 microhenries). * **-R:** RoHS compliant. --- ### 4. Typical Applications This component is commonly found in power management stages where space is limited but current requirements are high: 1. **DC-DC Converters:** Used in buck, boost, or SEPIC converters for voltage regulation. 2. **Mobile Devices:** Ideal for smartphones, tablets, and handheld gaming consoles due to its low profile. 3. **Computing:** Voltage Regulator Modules (VRMs) for CPUs and GPUs in laptops. 4. **Distributed Power Systems:** Point-of-Load (POL) modules. --- ### 5. Benefits and Trade-offs * **Pros:** Very low DCR (minimizes heat loss), high saturation current for its size, and excellent EMI shielding. * **Cons:** Higher cost compared to unshielded inductors; sensitive to extreme reflow soldering temperatures if not handled per J-STD-020 standards.