The part number **0420CDMCCDS-R10MC** refers to a high-current, low-profile **Power Inductor** manufactured by **Sumida**. These components are specifically designed for surface-mount technology (SMT) and are commonly used in DC-DC converters and power supply modules. --- ### 1. Technical Specifications The part number is an alphanumeric code that defines the physical and electrical characteristics of the inductor: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.10 µH (R10) | | **Tolerance** | ±20% (M) | | **Case Size** | 4.0 x 4.0 x 2.0 mm (0420) | | **DC Resistance (Max)** | ~4.4 mΩ | | **Saturation Current** | ~17.5 A | | **Operating Temperature** | -55°C to +125°C | --- ### 2. Breakdown of the Part Number Understanding the nomenclature helps in identifying similar components within the series: 1. **0420**: Indicates the dimensions. "04" represents the length/width (approx. 4mm) and "20" represents the height (2.0mm). 2. **CDMC**: Refers to the series type (Molded Power Inductor). 3. **CDS**: Specific internal design or material variation (often referring to core material improvements). 4. **R10**: The inductance value. "R" acts as the decimal point; thus, R10 = **0.10 µH**. 5. **M**: Tolerance code. M stands for **±20%**. 6. **C**: Packaging code (usually refers to Tape & Reel). --- ### 3. Key Features and Construction * **Metal Compound Core:** This inductor uses a metal powder molding technology. This allows for a higher saturation current compared to traditional ferrite drum cores. * **Magnetic Shielding:** The molded structure acts as a natural shield, minimizing Electromagnetic Interference (EMI) with surrounding components on the PCB. * **Low DCR:** The use of thick copper wire ensures low Direct Current Resistance (DCR), which reduces power loss and heat generation. * **Soft Saturation:** Unlike ferrite inductors that drop inductance sharply when over-current occurs, these molded inductors have a gradual saturation curve. --- ### 4. Common Applications Due to its high current capacity and small footprint, it is typically found in: * **Voltage Regulator Modules (VRM):** For CPUs and GPUs in laptops. * **DC-DC Converters:** Point-of-Load (POL) power supplies. * **Mobile Electronics:** Smartphones and tablets where board space is limited. * **Automotive:** Infotainment systems and LED lighting drivers. ---