## Technical Overview of HC2-4R7-R The **HC2-4R7-R** is a high-current, power inductor designed primarily for DC-DC converters and voltage regulator modules. It belongs to the HC2 series manufactured by **Eaton (formerly Coiltronics/Bussmann)**. ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 4.7 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 16.5 Amperes | | **Saturation Current (Isat)** | 18.0 Amperes | | **DC Resistance (DCR)** | 4.6 mΩ (Max) | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD) | | **Dimensions** | 13.5mm x 13.0mm x 5.5mm | --- ### 2. Composition and Design The HC2-4R7-R is engineered for high-efficiency power delivery. Its construction features include: * **Core Material:** Powered iron or ferrite-based material optimized for high-frequency switching. * **Winding:** Flat wire (foil) winding technology. This reduces "skin effect" losses and allows for a lower profile while maintaining high current capacity. * **Shielding:** It is a magnetically shielded design, which minimizes electromagnetic interference (EMI) with surrounding components on the PCB. --- ### 3. Common Applications This component is typically found in environments requiring high power density and stability: 1. **Multi-phase Regulators:** Used in CPU/GPU power supplies for servers and workstations. 2. **Voltage Regulator Modules (VRM):** Converting high bus voltages to low-voltage, high-current rails. 3. **Distributed Power Systems:** Used in telecommunications and industrial computing. 4. **DC-DC Converters:** Buck, boost, and buck-boost topologies. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in selecting alternatives: | Segment | Meaning | | :--- | :--- | | **HC2** | Product Series (High Current, size 2) | | **4R7** | Inductance value (4.7 microhenries) | | **-R** | RoHS compliant (Lead-free) | --- ### 5. Footprint Example (Recommended Pad Layout) ```markdown [ 4.0mm ] [ 4.0mm ] _______ _______ | | | | | Pad | < 5.0mm > | Pad | | 1 | | 2 | |_______| |_______| ``` *Note: Always refer to the manufacturer's datasheet for exact mechanical dimensions before PCB fabrication.*