The **MPIA4040R3-6R8-R** is a high-performance, automotive-grade miniature power inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the MPIA4040 series, known for its rugged construction and high power density. --- ### 1. Technical Specifications The part number encodes specific characteristics of the component. Below are the primary electrical and physical specifications: | Parameter | Value | | :--- | :--- | | **Inductance** | 6.8 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR) Typ.** | 92 mΩ | | **DC Resistance (DCR) Max.** | 110 mΩ | | **Saturation Current ($I_{sat}$)** | 3.4 A | | **RMS Current ($I_{rms}$)** | 2.5 A | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 4.0 x 4.0 x 3.0 mm | --- ### 2. Part Number Breakdown The nomenclature for this part is structured as follows: - **MPIA**: Metal Process Inductor, Automotive Grade. - **4040**: Dimensions (approx. 4.7mm x 4.3mm footprint). - **R3**: Profile/Height code (approx. 3.0mm maximum height). - **6R8**: Inductance value ($6.8 \times 10^0$ µH). - **-R**: RoHS compliant. --- ### 3. Key Features & Material Composition * **Molded Construction:** The inductor uses a metal powder core technology. The wire coil is placed inside a mold and pressed with iron powder resin, which provides excellent magnetic shielding and reduces audible "buzz" noise. * **Soft Saturation:** Unlike ferrite core inductors that drop inductance sharply when current limits are exceeded, this metal powder core exhibits a gradual (soft) saturation curve. * **AEC-Q200 Qualified:** It is tested for high reliability in automotive environments, making it resistant to mechanical shock, vibration, and moisture. --- ### 4. Common Applications Due to its small footprint and high current handling, it is typically used in: 1. **Automotive Electronics:** Infotainment systems, ADAS (Advanced Driver Assistance Systems), and LED lighting. 2. **DC-DC Converters:** Point-of-load (POL) converters for microprocessors. 3. **Battery Powered Devices:** Handheld terminals or industrial sensors where space is limited but efficiency is required. ---