The part number **0420CDMCCDS-R47MC** refers to a high-current, low-profile **Power Inductor** typically manufactured by Sumida or similar electronic component brands. These components are primarily used for DC-DC conversion in compact electronics. --- ### 1. Part Number Breakdown The alphanumeric code provides specific details regarding the physical size, material, and electrical properties: | Segment | Meaning | Detail | | :--- | :--- | :--- | | **0420** | Case Size | Approx. 4.0 x 4.0 mm footprint; 2.0 mm height. | | **CDMC** | Series Type | Molded Power Inductor (Metal Composite Core). | | **R47** | Inductance Value | **0.47 µH** (Microhenries). | | **M** | Tolerance | **±20%** (Standard for power inductors). | | **C** | Packaging/Internal | Internal control code for design revisions. | --- ### 2. Key Technical Specifications While exact values can vary slightly by manufacturer (e.g., Sumida vs. equivalents), the typical specs for a 0420 R47 inductor are: * **Inductance:** 0.47 µH. * **DC Resistance (DCR):** Very low, typically between **7.0mΩ and 10.0mΩ**. * **Saturation Current ($I_{sat}$):** Usually around **11A to 14A** (The point where inductance drops by 30%). * **Rated Current ($I_{rms}$):** Around **7A to 9A** (Based on temperature rise). * **Construction:** Metal powder molded (shielded). This provides excellent EMI performance and a soft saturation characteristic. --- ### 3. Features and Advantages * **Magnetic Shielding:** Because it is a molded metal composite, the magnetic field is contained, reducing interference with surrounding components. * **High Current Density:** Handles high peak currents despite its small 4x4mm footprint. * **Stability:** Metal composite cores are less sensitive to temperature fluctuations compared to traditional ferrite cores. * **Acoustic Quietness:** The molded construction minimizes "coil whine" (audible noise caused by magnetostriction). --- ### 4. Common Applications These inductors are found in high-efficiency power stages for: 1. **Laptops and Tablets:** CPU/GPU core power supplies (VRMs). 2. **Smartphones:** Battery management and high-speed charging circuits. 3. **SSD Drives:** Compact DC-DC converters for flash memory power. 4. **Automotive:** Infotainment systems and ADAS sensors.