The **MPI4040R3-R47-R** is a high-current, low-profile power inductor typically used in DC-DC converter applications. It belongs to the MPI4040 series manufactured by **Eaton (formerly Coiltronics)**. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's physical and electrical limits: | Segment | Meaning | Specification | | :--- | :--- | :--- | | **MPI** | Series Name | Molded Power Inductor | | **4040** | Package Size | 4.7mm x 4.06mm (Approx.) | | **R3** | Height Code | 1.85 mm (Low profile) | | **R47** | Inductance Value | 0.47 µH (Microhenries) | | **-R** | Compliance | RoHS Compliant | --- ### 2. Key Technical Specifications The "R47" variant is designed for high-frequency switching and high-current stability. | Parameter | Value | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | ~8.0 A to 10.5 A (Rise in temp dependent) | | **Saturation Current (Isat)** | ~14.0 A (Drops inductance by 30%) | | **DC Resistance (DCR)** | ~7.2 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Construction** | Metal powder core (Rugged/Shielded) | --- ### 3. Core Features & Benefits * **Molded Construction:** The inductor is made of a metal composite material molded around the coil. This provides excellent **magnetic shielding** to reduce Electromagnetic Interference (EMI). * **Soft Saturation:** Unlike ferrite cores that lose inductance abruptly when current limits are exceeded, this powder core has a "soft" saturation curve, making the circuit more stable under peak loads. * **Low DCR:** The low direct-current resistance ensures minimal power loss through heat, increasing the efficiency of the power supply. --- ### 4. Typical Applications This component is commonly found in space-constrained, high-performance electronics: * **Voltage Regulator Modules (VRMs):** For CPUs and GPUs in laptops. * **DC-DC Converters:** Point-of-load (POL) power supplies. * **Portable Electronics:** Tablets and handheld devices requiring high current in a small footprint. * **Automotive Infotainment:** Where EMI shielding is critical. ---