The **MPI4040R3-150-R** is a high-performance, power inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the MPI4040 series, which is characterized by its miniature size and high current-handling capabilities, typically used in DC-DC converters and voltage regulator modules. --- ## 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical properties: | Feature | Specification | | :--- | :--- | | **Inductance** | 15.0 µH (Microhenries) | | **Tolerance** | ±20% | | **DCR (Direct Current Resistance)** | ~185 mΩ (Nominal) | | **Rated Current (Irms)** | ~1.9 A (Amperes) | | **Saturation Current (Isat)** | ~3.0 A (Amperes) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 4.7mm x 4.06mm (Height: 4.0mm) | --- ## 2. Key Features and Construction The MPI4040R3-150-R utilizes specific engineering techniques to achieve high efficiency in a small footprint: * **Molded Construction:** The inductor is made using a metal powder molding process. This provides a "soft saturation" characteristic, meaning the inductance doesn't drop off abruptly when current increases. * **Magnetically Shielded:** The design minimizes Electromagnetic Interference (EMI), making it suitable for high-density PCB layouts near sensitive components. * **Rugged Design:** It is designed to withstand high vibration and thermal shocks. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and meets environmental standards. --- ## 3. Typical Applications Because of its balance between size and power handling, this part is commonly found in: * **Mobile Electronics:** Smartphones, tablets, and handheld devices. * **Computing:** Point-of-load (POL) converters and CPU power supplies. * **Battery Powered Systems:** Where high efficiency is required to extend battery life. * **DC-DC Converters:** Buck, boost, and buck-boost topologies. --- ## 4. Understanding the Part Number ```text MPI 4040 R3 - 150 - R | | | | | | | | | └── RoHS Compliant | | | └─────── Inductance Value (150 = 15.0 µH) | | └──────────── Revision/Series Version (R3) | └───────────────── Physical Size (4.0mm x 4.0mm approx) └────────────────────── Series (Metal Powder Inductor) ```