The **MPI5451R3-3R3-R** is a high-performance, power inductor manufactured by **Eaton (formerly Coiltronics)**. It belongs to the MPI (Miniature Power Inductor) series, specifically designed for high-current applications where space is limited. --- ### 1. Key Technical Specifications The part number encodes specific characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 3.3 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | ~5.8 Amps (Typical) | | **Saturation Current (Isat)** | ~8.0 Amps (Typical) | | **DC Resistance (DCR)** | 23.5 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 5.4mm x 5.1mm x 3.0mm | --- ### 2. Physical Construction The MPI5451R3 series utilizes **Metal Powder Core** technology. This construction provides several advantages over traditional ferrite cores: * **Soft Saturation:** Unlike ferrite inductors that drop inductance sharply when over-current occurs, this core saturates gradually. * **Magnetic Shielding:** The molded construction minimizes Electromagnetic Interference (EMI), making it safe for high-density PCB layouts. * **Ruggedness:** The composite metallic core is highly resistant to mechanical shock and thermal stress. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying variants: | Segment | Meaning | | :--- | :--- | | **MPI** | Series Name (Miniature Power Inductor) | | **5451R3** | Footprint size and Height (5.4 x 5.1 x 3.0 mm) | | **3R3** | Inductance Value (3.3 microhenries) | | **-R** | RoHS Compliant / Lead-Free | --- ### 4. Common Applications Due to its high current density and low profile, this part is frequently found in: 1. **DC-DC Converters:** Point-of-load (POL) modules for processors and FPGAs. 2. **Portable Electronics:** Tablets, laptops, and handheld medical devices. 3. **Battery Powered Systems:** Where high efficiency and low DCR (power loss) are critical. 4. **Network/Telecom:** Distributed power architectures. ---