The **MPIA4040R1-3R3-R** is a high-performance power inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the MPIA4040 series, which is specifically designed for automotive and industrial applications requiring high power density and reliability. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 3.3 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 48 mΩ (Typical) / 58 mΩ (Max) | | **Saturation Current ($I_{sat}$)** | 4.8 A | | **RMS Current ($I_{rms}$)** | 3.5 A | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 4.0mm x 4.0mm x 1.2mm (4040) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps identify the component's physical and electrical characteristics: * **MPIA**: Metal Process Inductor, Automotive Grade. * **4040**: Dimensions (approx. 4.7mm x 4.3mm footprint). * **R1**: Revision or internal design code (1.2mm height profile). * **3R3**: Inductance value (3.3 microhenries). * **-R**: RoHS compliant. --- ### 3. Core Features & Materials * **Molded Construction:** The inductor uses a metal powder molding technology. This provides a "soft saturation" characteristic, meaning the inductance drops gradually as current increases, rather than dropping off sharply. * **Magnetic Shielding:** The molded body acts as a natural shield, significantly reducing Electromagnetic Interference (EMI) which is critical in sensitive automotive circuits. * **AEC-Q200 Grade:** It is qualified for automotive use, meaning it can withstand high vibration, thermal shock, and mechanical stress. --- ### 4. Typical Applications This component is commonly found in DC-DC converters and Point-of-Load (POL) modules for: 1. **Automotive Infotainment:** Powering screens and processors. 2. **ADAS Systems:** Sensors and camera modules. 3. **Industrial Computing:** Compact high-efficiency power supplies. 4. **Battery Powered Devices:** Due to its low profile (1.2mm) and high efficiency. --- ### 5. Soldering & Footprint The device is a Surface Mount Device (SMD). Below is a representation of the typical landing pattern: ```text 4.0mm [<---------->] +------------+ ^ | [ PAD ] | | | | | 4.0mm | [ PAD ] | | +------------+ v ``` ---