The **MPI4040R4-4R7-R** is a high-performance, power inductor manufactured by Eaton (formerly Bussmann). It belongs to the **MPI4040** series, which is specifically designed for high-current applications where space is limited. --- ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify the technical specifications: | Segment | Meaning | Detail | | :--- | :--- | :--- | | **MPI** | Series Name | Miniature Power Inductor | | **4040** | Package Size | 4.7mm x 4.06mm (Footprint) | | **R4** | Version/Height | 4.0mm maximum height | | **4R7** | Inductance Value | 4.7 Microhenries (µH) | | **-R** | RoHS Compliant | Lead-free and environmentally safe | --- ### 2. Key Technical Specifications The MPI4040R4-4R7-R is characterized by its rugged construction and electrical efficiency. * **Inductance:** 4.7 µH * **Tolerance:** ±20% * **Rated Current ($I_{rms}$):** Approximately 3.3 A to 4.0 A (depending on temperature rise). * **Saturation Current ($I_{sat}$):** Approximately 5.8 A (the point where inductance drops by 30%). * **DC Resistance (DCR):** Typically around 40–50 mΩ. * **Operating Temperature:** -40°C to +125°C. * **Construction:** Metal composite core (molded) which provides "soft" saturation characteristics and shielded EMI performance. --- ### 3. Core Features and Benefits * **High Power Density:** Large current handling capability in a very small SMD (Surface Mount Device) footprint. * **Magnetically Shielded:** The molded construction minimizes electromagnetic interference (EMI), which is critical for sensitive surrounding circuitry. * **Low Core Loss:** Optimized for high-frequency switching regulators. * **Rugged Design:** Excellent resistance to thermal shock and mechanical vibration. --- ### 4. Common Applications This inductor is typically used in DC-DC converters and power management modules for: 1. **Consumer Electronics:** Laptops, tablets, and handheld gaming consoles. 2. **Telecommunications:** Network interface cards and base station power stages. 3. **Industrial:** Portable instrumentation and IoT sensors. 4. **Automotive:** Infotainment systems and non-safety critical electronic control units (ECUs). --- ### 5. Land Pattern (Typical) To integrate this part onto a PCB, the following footprint is generally used: ```markdown Dimensions in mm (Approximate): - Length: 4.70 mm - Width: 4.06 mm - Height: 4.00 mm ```