## MPI4040R2-4R7-R: Component Analysis The **MPI4040R2-4R7-R** is a high-performance, power inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the MPI4040 series, which is characterized by its miniature footprint and high current handling capabilities, often used in DC-DC converters. ### 1. Part Number Deciphering Understanding the nomenclature helps identify the technical specifications: | Segment | Meaning | Description | | :--- | :--- | :--- | | **MPI** | Series Name | Miniature Power Inductor | | **4040** | Dimensions | Approx. 4.7mm x 4.06mm footprint | | **R2** | Height Code | Height of approximately 2.0mm | | **4R7** | Inductance | **4.7 µH** (Microhenries) | | **-R** | RoHS | Compliant with environmental standards | --- ### 2. Key Technical Specifications Below are the typical electrical characteristics for this specific model: | Parameter | Value | | :--- | :--- | | **Inductance** | 4.7 µH | | **Tolerance** | ±20% | | **DCR (Max)** | ~83 mΩ (Direct Current Resistance) | | **Isat (Saturation Current)** | ~3.3 A (Current at which inductance drops 30%) | | **Irms (RMS Current)** | ~2.6 A (Current causing 40°C temperature rise) | | **Operating Temp** | -40°C to +125°C | --- ### 3. Construction and Features * **Core Material:** Composite metal powder. This allows for "soft saturation" characteristics, meaning the inductance decreases gradually rather than abruptly when current increases. * **Shielding:** It is a **magnetically shielded** construction. This minimizes Electromagnetic Interference (EMI), making it safe for high-density PCB layouts. * **Ruggedness:** Designed to handle high transient current spikes without saturating easily. ### 4. Typical Applications This part is commonly found in small electronic devices where space is premium but power efficiency is required: 1. **Handheld/Mobile Devices:** Smartphones, tablets, and wearable tech. 2. **DC-DC Converters:** Point-of-Load (POL) modules and buck/boost regulators. 3. **Computing:** Laptops and SSD power rails. 4. **Battery Powered Systems:** Efficiency is critical to extend battery life. --- ### 5. Footprint (Mechanical Data) If you are designing a PCB, the approximate dimensions are: * **Length:** 4.45 mm - 4.7 mm * **Width:** 4.06 mm * **Height:** 2.0 mm Max