The **MPIA4040R4-3R3-R** is a high-performance, automotive-grade power inductor manufactured by Eaton (formerly Cooper Bussmann). It belongs to the MPIA4040 series, known for its rugged construction and high current handling capabilities in a compact footprint. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's physical and electrical characteristics: | Code | Meaning | Description | | :--- | :--- | :--- | | **MPIA** | Series Name | Metal Process Inductor, Automotive Grade | | **4040** | Size Code | 4.7mm x 4.3mm footprint | | **R4** | Height | 2.0mm maximum height | | **3R3** | Inductance | 3.3 microhenries ($\mu H$) | | **R** | RoHS | Lead-free and compliant with environmental standards | --- ### 2. Key Technical Specifications The following table highlights the core electrical parameters: | Parameter | Specification | | :--- | :--- | | **Inductance** | 3.3 $\mu H$ | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 42 m$\Omega$ (Typical) / 51 m$\Omega$ (Max) | | **Rated Current ($I_{rms}$)** | 4.1 Amperes | | **Saturation Current ($I_{sat}$)** | 6.0 Amperes | | **Operating Temp** | -55°C to +125°C | | **Construction** | Metal powder core (shielded) | --- ### 3. Core Features & Benefits * **AEC-Q200 Qualified:** Specifically tested for the harsh environments of automotive electronics (vibration, thermal shock). * **High Current Density:** The metal powder technology allows for a higher saturation point compared to traditional ferrite cores, preventing "hard" saturation. * **Low EMI:** The magnetically shielded construction minimizes electromagnetic interference with surrounding components. * **Soft Saturation:** Unlike ferrite inductors that lose inductance sharply, this part has a gradual roll-off, which is safer for power supply stability. --- ### 4. Typical Applications This inductor is primarily used in DC-DC converters and voltage regulator modules (VRMs). Common use cases include: * **Automotive Infotainment:** Powering screens and processors. * **Advanced Driver Assistance Systems (ADAS):** Powering cameras and radar sensors. * **Industrial IoT:** Compact power modules for ruggedized sensors. * **Battery Powered Devices:** High-efficiency power conversion to extend battery life.