The **HCM0503-R47-R** is a high-performance, surface-mount (SMD) power inductor commonly used in DC-DC converters and voltage regulator modules. It belongs to the HCM series produced by Eaton (formerly Bussmann/Coiltronics). ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 11.0 Amperes (Temperature rise base) | | **Saturation Current (Isat)** | 16.0 Amperes (Inductance drop base) | | **DC Resistance (DCR)** | 8.0 mΩ (Typical) / 8.8 mΩ (Maximum) | | **Operating Temperature** | -55°C to +125°C | | **Case Size / Dimension** | 5.5mm x 5.3mm x 3.0mm | --- ### 2. Physical Construction & Design The HCM0503 series is designed with specific materials to handle high-current loads in a small footprint: * **Core Material:** It uses a molded iron powder core. This design provides "soft saturation" characteristics, meaning the inductance decreases gradually rather than dropping sharply when the current exceeds the limit. * **Shielding:** It is magnetically shielded, which minimizes Electromagnetic Interference (EMI) with surrounding components on the PCB. * **Terminals:** Features lead-free, RoHS-compliant solder-plated terminations suitable for high-density SMT assembly. --- ### 3. Application Use Cases Because of its high current handling and low DCR, this part is typically found in: 1. **Computing:** Multi-phase regulators, voltage regulator modules (VRMs) for CPUs and GPUs. 2. **Power Supplies:** Buck, Boost, and Buck-Boost converters. 3. **Battery Powered Devices:** High-efficiency power management for portable electronics. 4. **Networking:** Base stations and data center switches. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying similar parts: * **HCM:** Series Name (High Current Inductor, Molded). * **0503:** Package size (approx. 5mm x 5mm, 3mm height). * **R47:** Inductance value (R denotes the decimal point; R47 = 0.47 µH). * **-R:** RoHS compliant.