The **MPIA4040R1-R68-R** is a high-performance, automotive-grade power inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the MPIA4040 series, which is characterized by its rugged construction and high power density. --- ### 1. Key Technical Specifications Below are the electrical and physical parameters for this specific part number: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.68 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 9.8 mΩ (Typical) / 11.5 mΩ (Max) | | **Rated Current (Irms)** | 8.8 A (Temperature rise dependent) | | **Saturation Current (Isat)** | 11.5 A (Inductance drop dependent) | | **Operating Temperature** | -55°C to +125°C | | **Case Size** | 4040 (4.7mm x 4.06mm) | | **Height** | 1.2 mm (Low Profile) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **MPIA**: Metal Process Inductor, Automotive Grade. * **4040**: Dimensions (approx. 4.0mm x 4.0mm). * **R1**: Revision or specific height code (1.2mm). * **R68**: Inductance value ($0.68 \mu H$). * **-R**: RoHS compliant. --- ### 3. Core Features & Technology * **Molded Construction:** The inductor uses a metal powder core technology. The wire is placed inside a mold, and metallic powder is pressed around it. This creates a "shielded" structure that minimizes EMI (Electromagnetic Interference). * **Soft Saturation:** Unlike ferrite cores that lose inductance abruptly when current limits are exceeded, this metal powder core exhibits a gradual (soft) saturation curve. * **AEC-Q200 Qualified:** This indicates the part has passed rigorous stress testing for automotive environments, including high vibration and thermal shock. --- ### 4. Typical Applications Due to its high current handling and small footprint, the MPIA4040R1-R68-R is commonly used in: 1. **Automotive Electronics:** Infotainment systems, Advanced Driver Assistance Systems (ADAS), and body electronics. 2. **DC-DC Converters:** Point-of-Load (POL) modules requiring high efficiency. 3. **Battery Powered Devices:** Laptops and handhelds where vertical space (1.2mm height) is limited. ---