## Detailed Technical Overview: MPI5451R3-R47-R The **MPI5451R3-R47-R** is a high-current, low-profile power inductor part of the **MPI5451 series** manufactured by Eaton (formerly Bussmann). These components are specifically designed for high-density power applications where space is limited and efficiency is critical. ### 1. Key Specifications The following table highlights the primary electrical and physical characteristics of this specific part: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 3.1 mΩ (Typical) / 3.7 mΩ (Max) | | **Rated Current (Irms)** | 16.5 A | | **Saturation Current (Isat)** | 26.0 A | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 5.7mm x 5.4mm x 1.2mm (Shielded) | --- ### 2. Core Features and Construction * **Molded Construction:** The inductor is made using a metal powder molding process. This provides a "soft saturation" characteristic, meaning the inductance drops gradually as current increases, rather than dropping sharply. * **Magnetic Shielding:** The design is inherently shielded, which minimizes Electromagnetic Interference (EMI) with surrounding components on the PCB. * **Low Profile:** With a height of only 1.2mm, it is ideal for thin electronic devices like tablets, ultra-thin laptops, and compact IoT modules. * **High Efficiency:** The extremely low DC Resistance (DCR) minimizes power loss due to heat, making it suitable for high-frequency DC-DC converters. --- ### 3. Applications The MPI5451R3-R47-R is commonly found in: 1. **Voltage Regulator Modules (VRMs):** Used in CPUs and GPUs for power delivery. 2. **Point-of-Load (POL) Converters:** Step-down converters for local power rails. 3. **Battery Powered Devices:** Smartphones and handheld devices where battery life depends on inductor efficiency. 4. **Distributed Power Systems:** Low-voltage, high-current power distribution. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variations: | Segment | Meaning | | :--- | :--- | | **MPI5451** | Product Series (Dimensions roughly 5.4 x 5.1mm) | | **R3** | Revision or Internal Designator | | **R47** | Inductance Value (R47 = 0.47 µH) | | **-R** | RoHS Compliant / Lead-Free |