The **MPI5451R3-4R7-R** is a high-performance, shielded power inductor part of the MPI5451 series manufactured by **Eaton (formerly Cooper Bussmann)**. It is designed specifically for high-current power applications where space and efficiency are critical. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical and physical properties: | Parameter | Value | Details | | :--- | :--- | :--- | | **Inductance** | 4.7 µH | Measured at 100 kHz, 0.1 Vrms | | **Tolerance** | ±20% | Standard industry tolerance for power inductors | | **DCR (Max)** | 42.0 mΩ | Maximum DC resistance at 20°C | | **Rated Current (Irms)** | 3.8 A | Based on a 40°C temperature rise | | **Saturation Current (Isat)** | 5.5 A | Point where inductance drops by ~30% | | **Operating Temp** | -40°C to +125°C | Suitable for industrial and automotive environments | --- ### 2. Key Physical Features * **Dimensions:** Approximately 5.4mm x 5.2mm x 1.2mm (Small footprint, low profile). * **Construction:** Metal composite material which provides high saturation current and prevents "hard" saturation (where the inductor suddenly loses efficiency). * **Shielding:** Magnetically shielded to minimize Electromagnetic Interference (EMI) with surrounding components. * **Mounting:** Surface Mount Device (SMD/SMT). --- ### 3. Applications Due to its combination of high current handling and small size, this inductor is commonly found in: 1. **DC-DC Converters:** Buck, boost, or SEPIC converters in handheld electronics. 2. **Computing:** Voltage Regulator Modules (VRMs) for CPUs and GPUs in laptops and tablets. 3. **Battery Powered Devices:** Optimized for low power loss to extend battery life. 4. **Distributed Power Systems:** Used in point-of-load (POL) modules. --- ### 4. Part Number Breakdown `MPI5451R3-4R7-R` * **MPI5451:** Series designation (5.4 x 5.2 mm footprint). * **R3:** Revision or specific manufacturing process code. * **4R7:** Inductance value (4.7 microhenries). * **-R:** RoHS compliant (lead-free). ---