The **HC3-4R7-R** is a high-current power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the HC3 series, which is designed for high-density, high-current applications where thermal stability and low core loss are critical. --- ### ## Technical Specifications Below are the primary electrical and physical characteristics of the HC3-4R7-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 4.7 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 9.5 mΩ (Typical) | | **Rated Current (Irms)** | 11.2 Amperes | | **Saturation Current (Isat)** | 14.5 Amperes | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | Surface Mount (SMD) - HC3 footprint | | **Dimensions** | ~ 11.5mm x 11.5mm x 6.0mm | --- ### ## Key Features 1. **High Current Density**: The inductor is engineered to handle significant power in a relatively small surface-mount footprint. 2. **Powder Iron Core**: It utilizes a powdered iron core material. This provides a "soft" saturation characteristic, meaning the inductance drops gradually rather than abruptly as current increases. 3. **Low EMI**: The magnetic construction helps contain the magnetic field, reducing Electromagnetic Interference (EMI) in sensitive circuits. 4. **Low Core Loss**: Optimized for high-frequency DC-DC converters, ensuring minimal energy is wasted as heat. --- ### ## Common Applications The HC3-4R7-R is typically found in power management stages for: * **Voltage Regulator Modules (VRMs)**: Used in servers and high-end desktops. * **Multi-phase Buck Converters**: Found in telecommunications equipment. * **Industrial Power Supplies**: For stable voltage regulation under heavy loads. * **Distributed Power Systems**: Where localized DC-DC conversion is required. --- ### ## Component Identification * **HC3**: The Series name (High Current, Size 3). * **4R7**: The inductance value (4.7 microhenries). The 'R' acts as the decimal point. * **-R**: Indicates that the part is RoHS compliant (lead-free).