The **MPIA4040R4-R47-R** is a high-performance power inductor, typically manufactured by Eaton (formerly Cooper Bussmann). It belongs to the MPIA4040 series, which is characterized by its miniature size, high current capacity, and rugged molded construction. --- ### 1. Specification Breakdown The part number follows a specific nomenclature that defines its physical and electrical characteristics: | Code Segment | Description | Specific Value | | :--- | :--- | :--- | | **MPIA** | Series Name | Metal Process Inductor, Automotive Grade | | **4040** | Physical Size | 4.0mm x 4.0mm (Footprint) | | **R4** | Height Profile | 1.2mm (Maximum Height) | | **R47** | Inductance Value | 0.47 µH (Microhenries) | | **-R** | Compliance | RoHS Compliant | --- ### 2. Key Electrical Parameters These values are critical for circuit design, particularly in DC-DC buck or boost converters. * **Inductance:** 0.47 µH ±20% * **Isat (Saturation Current):** Approximately **6.3A** (The current at which inductance drops by 30%). * **Irms (Heating Current):** Approximately **5.5A** (The current that causes a 40°C temperature rise). * **DCR (DC Resistance):** Typically **16.5 mΩ** (lower resistance leads to higher efficiency). * **Operating Temperature:** -40°C to +125°C. --- ### 3. Physical Features & Construction The component is engineered for harsh environments and high-density PCB layouts: * **Molded Construction:** The coil is embedded in a metal powder composite material. This provides excellent magnetic shielding to reduce Electromagnetic Interference (EMI). * **Rugged Design:** The "Automotive Grade" designation implies it is tested for higher vibrations and thermal shocks compared to standard consumer parts. * **Low Profile:** At only 1.2mm tall, it is ideal for thin portable electronics. --- ### 4. Common Applications Due to its high current handling and small footprint, the MPIA4040R4-R47-R is used in: 1. **Automotive Electronics:** Infotainment systems, Advanced Driver Assistance Systems (ADAS). 2. **Power Management:** High-frequency DC-DC converters. 3. **Industrial IoT:** Compact sensors and communication modules. 4. **Mobile Devices:** Handheld terminals and high-end consumer tablets. ---