The **MPIA4040R4-100-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 current density and compact footprint. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's specific characteristics: | Component Segment | Meaning | Value | | :--- | :--- | :--- | | **MPIA** | Series Name | Miniature Power Inductor, Automotive Grade | | **4040** | Package Size | 4.7mm x 4.06mm | | **R4** | Height Code | 4.0mm max height | | **100** | Inductance Value | 10.0 µH (10 plus 0 zeros) | | **-R** | Compliance | RoHS Compliant | --- ### 2. Key Technical Specifications The electrical behavior of this inductor is optimized for DC-DC converter applications where efficiency and space are critical. | Parameter | Value | | :--- | :--- | | **Inductance** | 10.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 93 mΩ (Typical) | | **Rated Current ($I_{rms}$)** | 2.5 Amperes | | **Saturation Current ($I_{sat}$)** | 3.8 Amperes | | **Operating Temperature** | -55°C to +125°C | | **AEC-Q200** | Qualified (Grade 1) | --- ### 3. Core Features * **Rugged Construction:** Features a molded metal powder material which provides "soft" saturation characteristics (the inductance doesn't drop off instantly when current increases). * **Shielded Design:** The magnetic shielding minimizes Electromagnetic Interference (EMI), which is vital for sensitive automotive electronics. * **High Efficiency:** Low DCR helps minimize power loss through heat, extending battery life in portable or automotive systems. * **Environmental Reliability:** Designed to handle high vibrations and thermal shocks typical in engine compartments or cabin electronics. --- ### 4. Common Applications This inductor is typically found in the following circuits: 1. **Automotive Systems:** Infotainment, ADAS (Advanced Driver Assistance Systems), and body electronics. 2. **DC-DC Converters:** Buck, Boost, and SEPIC topologies. 3. **Industrial IoT:** Powering sensors and wireless modules in harsh environments. 4. **LED Lighting:** Constant current drivers for automotive or industrial lighting. ---