The **MPIA4040R1-R10-R** is a specific part number for a high-current power inductor typically used in automotive and industrial electronics. This part is manufactured by **Eaton (formerly Bussmann)** as part of the MPIA4040 series. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's physical and electrical characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **MPIA** | Series | Miniature Power Inductor, Automotive Grade | | **4040** | Case Size | ~4.7mm x 4.3mm (Footprint) | | **R1** | Profile/Revision | 1.2mm or 1.5mm height or revision level | | **R10** | Inductance Value | **0.10 µH** (R denotes the decimal point) | | **-R** | RoHS Compliance | Lead-free and RoHS compliant | --- ### 2. Key Specifications This inductor is designed for high-frequency DC-DC converters where space is limited but current demand is high. * **Inductance:** 0.10 µH * **Tolerance:** Typically ±20% * **Operating Temperature:** -40°C to +125°C (AEC-Q200 Grade 1 qualified) * **Construction:** Molded metal composite (provides magnetic shielding and low EMI) * **Saturation Current ($I_{sat}$):** Extremely high for its size (often exceeding 20A-30A depending on the specific revision). * **DC Resistance (DCR):** Very low (measured in mΩ) to minimize power loss. --- ### 3. Core Features and Applications #### Features * **Rugged Design:** Automotive grade (AEC-Q200), meaning it can withstand high vibration and thermal shock. * **Soft Saturation:** The molded powder core ensures that the inductance doesn't drop off abruptly when current increases. * **Low EMI:** The shielded construction contains the magnetic flux, preventing interference with surrounding circuits. #### Typical Applications 1. **Automotive Infotainment:** Powering displays and head units. 2. **ADAS:** Advanced Driver Assistance Systems requiring stable power. 3. **High-Current VRMs:** Voltage Regulator Modules in compact computing devices. 4. **Battery Powered Systems:** Where high efficiency is required to extend battery life. --- ### 4. Comparison with Standard Inductors Compared to standard ferrite core inductors, the **MPIA4040** series offers: | Feature | MPIA4040R1 (Metal Composite) | Standard Ferrite Inductor | | :--- | :--- | :--- | | **Size** | Ultra-compact | Bulkier for same current | | **Saturation** | Gradual (Soft) | Sharp (Hard) | | **Acoustic Noise** | Low (Solid construction) | High (Potential buzzing) | | **Reliability** | High (Automotive rated) | Consumer grade |