The **MPIA4040R3-150-R** is a high-current, automotive-grade power inductor manufactured by **Eaton (formerly Coiltronics)**. It belongs to the MPIA4040 series, known for its rugged construction and high efficiency in small form factors. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its physical and electrical characteristics. | Parameter | Specification | | :--- | :--- | | **Inductance** | 15.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 165 mΩ (Typical) / 198 mΩ (Maximum) | | **Rated Current ($I_{rms}$)** | 1.9 Amps (Temperature rise base) | | **Saturation Current ($I_{sat}$)** | 2.5 Amps (30% drop in inductance) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 4.7 x 4.31 x 4.0 mm (Length x Width x Height) | --- ### 2. Part Number Breakdown Understanding the code helps in identifying variations within the product family: * **MPIA**: Metal Process Inductor, Automotive Grade. * **4040**: Dimensions (approx. 4.0mm x 4.0mm footprint). * **R3**: Revision/Series indicator (High current/low DCR version). * **150**: Inductance value (15 followed by 0 zeros = 15.0 µH). * **-R**: RoHS compliant. --- ### 3. Key Features & Construction The component is engineered for demanding environments where reliability is critical. * **Molded Construction:** The coil is embedded in a metal powder core. This provides **magnetic shielding**, reducing Electromagnetic Interference (EMI) with surrounding components. * **Soft Saturation:** Unlike ferrite inductors that lose inductance sharply when current limits are exceeded, this inductor has a "soft" saturation curve, maintaining stability during current spikes. * **AEC-Q200 Qualified:** This means it has passed rigorous stress testing for vibration, thermal shock, and moisture resistance, making it suitable for automotive under-the-hood or cabin electronics. * **Low DCR:** Designed to minimize power loss through heat (Joule heating), improving overall power supply efficiency. --- ### 4. Typical Applications Commonly used in DC-DC converters and power management modules for: 1. **Automotive:** Infotainment systems, Advanced Driver Assistance Systems (ADAS), and LED lighting. 2. **Industrial:** High-density power supplies and battery-operated devices. 3. **Computing:** Voltage Regulator Modules (VRMs) for compact servers or embedded PCs. ---