The **MPI5451R3-1R0-R** is a high-performance, shielded power inductor designed by **Eaton (formerly Cooper Bussmann)**. It belongs to the MPI (Molded Powder Inductor) series, known for high current density and low core losses in a compact surface-mount package. --- ### ## Technical Specifications Below are the key electrical and physical parameters for the `MPI5451R3-1R0-R`: | Parameter | Value | | :--- | :--- | | **Inductance** | 1.0 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 10.0 Amperes | | **Saturation Current (Isat)** | 13.0 Amperes | | **DC Resistance (DCR)** | 9.1 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 5.4mm x 5.1mm | | **Height** | 3.0mm (Max) | --- ### ## Key Features and Construction 1. **Molded Construction:** The part uses a metal powder molding technology. The coil is embedded directly into a magnetic iron powder mixture, which provides excellent magnetic shielding and minimizes EMI (Electromagnetic Interference). 2. **Soft Saturation:** Unlike ferrite core inductors that have a sharp drop in inductance when current limits are exceeded, this molded powder inductor exhibits "soft saturation." This means the inductance decreases gradually as current increases, providing better stability in power circuits. 3. **High Efficiency:** The low DCR (Direct Current Resistance) ensures minimal power loss through heat, making it ideal for high-efficiency DC-DC converters. 4. **Rugged Design:** The composite structure is highly resistant to thermal shock and mechanical vibration. --- ### ## Applications The MPI5451R3-1R0-R is typically used in power management circuits where space is limited but high current is required: * **DC-DC Converters:** Point-of-load (POL) modules for CPUs and GPUs. * **Consumer Electronics:** Laptops, tablets, and handheld gaming consoles. * **Battery Powered Systems:** Efficiency is critical to extend battery life. * **Distributed Power Systems:** Used in telecommunications and networking equipment. --- ### ## Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **MPI:** Series Name (Molded Powder Inductor). * **5451:** Physical Dimensions (Approx. 5.4mm x 5.1mm). * **R3:** Revision or internal designator for the 3.0mm height profile. * **1R0:** Inductance value (1.0 microhenries). * **R:** RoHS compliant.