The **MPIA4040R2-3R3-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 density and low profile. --- ## 1. Part Number Breakdown Understanding the nomenclature helps identify its physical and electrical characteristics: | Code Segment | Meaning | | :--- | :--- | | **MPIA** | Automotive Grade, High Power, Metal Composite Inductor | | **4040** | Package Size: Approx. 4.7 x 4.3 mm | | **R2** | Height Code: 2.0 mm maximum height | | **3R3** | Inductance Value: **3.3 μH** (R denotes the decimal point) | | **-R** | RoHS Compliant | --- ## 2. Technical Specifications The device is designed for demanding environments, utilizing a metal powder core for soft saturation. ### Electrical Characteristics * **Inductance:** 3.3 μH (Tolerance: ±20%) * **Rated Current (Irms):** ~3.8 A (Current that causes a 40°C temperature rise) * **Saturation Current (Isat):** ~4.3 A (Current that causes a 30% drop in inductance) * **DC Resistance (DCR):** ~48 mΩ (typical) / 58 mΩ (maximum) * **Operating Temperature:** -40°C to +125°C ### Mechanical Construction * **Shielding:** Magnetically shielded (low EMI interference). * **Core Material:** Metal composite (prevents hard saturation at high peaks). * **Terminals:** Lead-free, Solder-plated. --- ## 3. Key Applications Because of its **AEC-Q200 Grade 1** qualification, this inductor is primarily used in: 1. **Automotive Electronics:** Infotainment systems, ADAS cameras, and ECU power supplies. 2. **DC-DC Converters:** Point-of-load (POL) modules and high-efficiency buck/boost converters. 3. **Industrial IoT:** Compact sensors and handheld devices requiring rugged power management. 4. **Mobile Devices:** High-current power rails in tablets and notebooks. --- ## 4. Design Advantages * **Soft Saturation:** Unlike ferrite cores that lose inductance sharply, the MPIA series has a gradual roll-off, making it safer for transient spikes. * **Thermal Stability:** It maintains performance even at elevated ambient temperatures common in engine compartments or cramped enclosures. * **Low EMI:** The molded construction minimizes magnetic flux leakage.