The **MPI4040R1-R15-R** is a high-performance, low-profile power inductor typically used in DC-DC converter applications. It belongs to the MPI4040 series manufactured by Eaton (formerly Coiltronics). --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its physical and electrical properties. | Parameter | Value / Description | |:---|:---| | **Inductance** | 0.15 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 4.8 mΩ (Typical) / 5.8 mΩ (Maximum) | | **Irms (Rated Current)** | 14.5 Amperes | | **Isat (Saturation Current)** | 23.0 Amperes | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 4.7mm x 4.06mm x 1.2mm (4040 footprint) | --- ### 2. Key Features and Construction * **Molded Construction:** The inductor uses a metal powder core technology. This "molded" design provides excellent magnetic shielding and minimizes EMI (Electromagnetic Interference). * **Soft Saturation:** Unlike ferrite inductors that drop inductance sharply when current limits are exceeded, this part has a "soft" saturation curve, making the circuit more stable under transient loads. * **Low Profile:** At only 1.2mm in height, it is ideal for thin electronic devices like tablets, ultra-thin laptops, and handheld IoT sensors. * **Halogen Free & RoHS Compliant:** Meets modern environmental safety standards for lead-free soldering processes. --- ### 3. Part Number Breakdown The nomenclature `MPI4040R1-R15-R` can be decoded as follows: 1. **MPI**: Series name (Molded Power Inductor). 2. **4040**: Physical dimensions (approx. 4.0mm x 4.0mm). 3. **R1**: Height code (R1 indicates a height of ~1.2mm). 4. **R15**: Inductance value (R15 = 0.15 microhenries). 5. **-R**: RoHS compliant suffix. --- ### 4. Typical Applications * **Voltage Regulator Modules (VRM):** Used in CPU and GPU power delivery. * **Point-of-Load (POL) Converters:** High-frequency DC-DC converters. * **Battery Powered Devices:** Due to high efficiency and small footprint. * **Smartphones & Tablets:** Specifically for high-current power rails.