The **0420CDMCCDS-R56MC** is a specific part number for a surface-mount (SMD) power inductor manufactured by **Sumida**. This component is widely used in DC-DC converters for laptops, servers, and high-current power supplies. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **0420** | Physical Size | 4.0mm x 4.0mm x 2.0mm (approx.) | | **CDMC** | Series Type | Metal Composite Molded Inductor | | **CDS** | Structure | Shielded, Low Profile | | **R56** | Inductance Value | **0.56 µH** (R denotes decimal point) | | **M** | Tolerance | ±20% | | **C** | Packaging | Carrier Tape & Reel | --- ### 2. Key Specifications Based on the standard datasheet for the 0420CDMC series, here are the technical parameters: * **Inductance:** 0.56 µH * **DC Resistance (DCR):** Extremely low (typically between 8mΩ to 12mΩ). * **Saturation Current (Isat):** The current level where inductance drops by ~30%. Usually ranges from **8A to 12A** for this specific size. * **Temperature Rise Current (Irms):** The current that causes a 40°C temperature rise. Usually around **7A to 9A**. * **Operating Temperature:** -55°C to +125°C. --- ### 3. Construction and Materials This part belongs to the **Molded Metal Composite** category, which differs from traditional wire-wound ferrite inductors: * **Core Material:** Iron powder or a metal alloy powder pressed around the coil. * **Magnetic Shielding:** Naturally shielded due to the molded construction, which reduces Electromagnetic Interference (EMI). * **Saturation Characteristic:** It features "Soft Saturation," meaning the inductance drops gradually as current increases, rather than a sharp drop-off seen in ferrite cores. --- ### 4. Applications Because of its high current handling and small footprint, it is commonly found in: * **Voltage Regulator Modules (VRMs):** For CPU and GPU power. * **Battery Powered Devices:** Smartphones and tablets. * **DC/DC Converters:** Point-of-load (POL) power supplies. ---