The **MPIA4040R1-R47-R** is a high-performance, automotive-grade power inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the MPIA4040 series, which is characterized by its rugged construction and high power density. --- ### 1. Technical Specifications The part number can be decoded to understand its specific electrical and physical properties: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Inductance** | 0.47 µH | Tolerance is typically ±20% | | **DC Resistance (DCR)** | ~7.2 mΩ (Typ) | Low resistance for high efficiency | | **Rated Current (Irms)** | ~10.5 Amps | Current causing a 40°C temperature rise | | **Saturation Current (Isat)** | ~16.0 Amps | Current causing a 30% drop in inductance | | **Operating Temp** | -55°C to +125°C | AEC-Q200 Grade 1 qualified | | **Package Size** | 4.7 x 4.3 x 1.2 mm | Low profile "4040" footprint | --- ### 2. Key Features * **Metal Composite Construction:** Uses a molded iron powder core which provides "soft" saturation characteristics (the inductance drops gradually rather than abruptly). * **Magnetic Shielding:** The molded design inherently shields the inductor, reducing Electromagnetic Interference (EMI) with surrounding components. * **Automotive Grade:** Qualified under **AEC-Q200**, meaning it is tested for high vibration, thermal shock, and mechanical stress. * **High Power Density:** Large current handling capability relative to its very small 1.2mm height. --- ### 3. Pinout and Footprint The device is a surface-mount device (SMD) with two large solder pads on the bottom. ```markdown [ Top View ] _________________ | | | (R47) | <-- Part Marking | (xxxx) | <-- Lot Code |_________________| [ Bottom View ] ___ ___ | | | | | 1 |---------| 2 | |___| |___| (Pad) (Pad) ``` --- ### 4. Common Applications * **Automotive Electronics:** Infotainment systems, Advanced Driver Assistance Systems (ADAS), and LED lighting. * **DC-DC Converters:** High-frequency switching regulators where space is limited. * **Industrial IoT:** Powering sensors and communication modules that require ruggedized components. * **Computing:** Voltage Regulator Modules (VRMs) for low-voltage processors.