The **MPIA4040R4-4R7-R** is a high-performance, automotive-grade power inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the MPIA4040 series, known for its high current handling and compact footprint. --- ### 1. Technical Specifications The following table highlights the core electrical and physical characteristics of this component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 4.7 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 78 mΩ (Typical) / 94 mΩ (Max) | | **Rated Current (Irms)** | 3.1 Amps | | **Saturation Current (Isat)** | 4.2 Amps | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 4.7mm x 4.06mm x 4.0mm | | **Shielding** | Shielded (Molded construction) | --- ### 2. Part Number Breakdown The nomenclature provides specific details about the component's build: * **MPIA**: Metal Process Inductor, Automotive grade. * **4040**: Dimensions (approx. 4.0mm x 4.0mm). * **R4**: Revision or specific height profile code (approx. 4.0mm height). * **4R7**: Inductance value (4.7 microhenries). * **-R**: RoHS compliant. --- ### 3. Key Features and Construction * **Molded Construction:** The inductor uses a composite iron powder material molded around the coil. This provides excellent magnetic shielding to minimize Electromagnetic Interference (EMI). * **Soft Saturation:** Unlike ferrite core inductors that drop inductance sharply when current limits are exceeded, this metal powder core exhibits "soft saturation," meaning inductance decreases gradually. * **Automotive Grade:** It is **AEC-Q200 Grade 1 qualified**, making it suitable for high-reliability environments subject to vibration and thermal cycling. --- ### 4. Typical Applications This inductor is primarily used in DC-DC converter circuits for: 1. **Automotive Electronics:** Infotainment systems, Advanced Driver Assistance Systems (ADAS), and LED lighting. 2. **Industrial Power:** Compact power supplies requiring high power density. 3. **Battery Powered Devices:** Handheld terminals or portable medical equipment where space and efficiency are critical.