The **MPIA4040R2-4R7-R** is a high-performance, automotive-grade power inductor manufactured by Eaton (formerly Cooper Bussmann). It belongs to the MPIA4040 series, known for its high power density and rugged construction. --- ### 1. Part Number Breakdown Understanding the nomenclature helps in identifying its specific electrical characteristics: | Code Segment | Meaning | Details | | :--- | :--- | :--- | | **MPIA** | Series Name | Metal Process Inductor, Automotive Grade | | **4040** | Package Size | 4.7mm x 4.06mm (Footprint) | | **R2** | Height Code | 2.0mm maximum height | | **4R7** | Inductance Value | **4.7 µH** (R denotes the decimal point) | | **-R** | RoHS Compliance | Lead-free and RoHS compliant | --- ### 2. Key Technical Specifications This component is designed for efficiency in DC-DC converter applications. | Parameter | Specification | | :--- | :--- | | **Inductance** | 4.7 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~70 mΩ (Typical) | | **Rated Current ($I_{rms}$)** | ~3.1 A (Temperature rise dependent) | | **Saturation Current ($I_{sat}$)** | ~3.5 A (Inductance drop dependent) | | **Operating Temperature** | -40°C to +125°C | | **Construction** | Metal powder core (Shielded) | --- ### 3. Core Features * **Automotive Grade:** Qualified to **AEC-Q200 Grade 1** standards, making it suitable for under-the-hood or cabin electronics. * **Magnetically Shielded:** The molded metal powder construction minimizes Electromagnetic Interference (EMI), which is critical in sensitive automotive circuits. * **Soft Saturation:** Unlike ferrite cores that drop inductance sharply when over-current occurs, this metal powder core exhibits a gradual (soft) saturation curve. * **High Efficiency:** Low DCR helps minimize power loss and heat generation during high-frequency switching. --- ### 4. Common Applications Due to its robust nature and small footprint, it is frequently used in: 1. **Automotive Infotainment:** Powering displays and navigation systems. 2. **ADAS Systems:** Supplying stable voltage to sensors and cameras. 3. **DC-DC Converters:** Point-of-load (POL) modules in space-constrained environments. 4. **LED Lighting:** Driver circuits for automotive headlamps or interior lighting. ---