The **MPIA4040R4-R33-R** is a high-performance, power inductor manufactured by Eaton (formerly Bussmann). It is part of the MPIA (Miniature Power Inductor) series, specifically designed for automotive applications and compact electronic circuits. --- ### 1. Key Technical Specifications | Parameter | Value | Notes | | :--- | :--- | :--- | | **Inductance** | 0.33 µH | Measured at 100 kHz, 0.1 Vrms | | **Tolerance** | ±20% | Standard for power inductors | | **Current Rating (Irms)** | 11.5 A | Current that causes a 40°C temperature rise | | **Saturation Current (Isat)** | 17.0 A | Current at which inductance drops by ~30% | | **DC Resistance (DCR)** | 4.8 mΩ (Typ) | Max DCR is usually around 5.8 mΩ | | **Package Size** | 4.7 x 4.3 x 4.0 mm | "4040" footprint | | **Operating Temp** | -55°C to +125°C | AEC-Q200 Qualified | --- ### 2. Part Number Breakdown The nomenclature provides specific details about the component's construction: * **MPIA**: Miniature Power Inductor, Automotive grade. * **4040**: Dimensions (approx. 4.0mm x 4.0mm footprint). * **R4**: Height code (4.0mm max height). * **R33**: Inductance value (0.33 µH). * **-R**: RoHS compliant. --- ### 3. Core Features & Technology * **Molded Construction:** The inductor uses a metal powder core technology. The wire is molded directly into the magnetic material, which provides excellent shielding against Electromagnetic Interference (EMI). * **High Current Density:** Due to its low DCR and high saturation levels, it can handle significant bursts of power without the core "saturating" (losing its inductive properties). * **Soft Saturation:** Unlike ferrite inductors that drop inductance sharply, this metal powder core has a "soft" saturation curve, making the circuit more stable under heavy loads. * **AEC-Q200 Grade:** It is tested to withstand the harsh environments of automotive electronics (vibration, thermal shock, and moisture). --- ### 4. Typical Applications This specific part is commonly found in: 1. **DC-DC Converters:** Used as the energy storage element in buck or boost regulators. 2. **Automotive Infotainment:** Powering head units, navigation, and displays. 3. **ADAS Systems:** Providing stable power to sensors and cameras. 4. **Industrial Computing:** High-efficiency power modules where space is limited. ---