The **0415CDMCCDS-R33MC** is a high-performance, surface-mount (SMD) power inductor. This component is part of the **CDMC** series manufactured by **Sumida**, commonly used for DC-DC converter applications where high efficiency and low core loss are required. ### 1. Component Breakdown The part number follows a specific nomenclature used by Sumida to define its physical and electrical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **0415** | Case Size | Approx. 4.0mm x 4.0mm x 1.5mm | | **CDMC** | Series Type | Metal composite mold type inductor | | **CDS** | Construction | Standard magnetic shielding | | **R33** | Inductance | **0.33 µH** (R denotes decimal) | | **M** | Tolerance | **±20%** | | **C** | Packaging | Carrier Tape & Reel | --- ### 2. Technical Specifications Based on the standard datasheet for this series, here are the primary electrical characteristics: * **Inductance:** 0.33 µH * **DC Resistance (DCR):** Extremely low (typically in the range of 5–10 mΩ), which minimizes power dissipation. * **Saturation Current ($I_{sat}$):** The current level where inductance drops by 30%. For this size, it is typically between **7A and 11A**. * **Temperature Rise Current ($I_{rms}$):** The current that causes a 40°C temperature rise, usually around **6A to 9A**. * **Operating Temperature:** -40°C to +125°C (including self-heating). --- ### 3. Key Features & Materials The "Metal Composite" construction is the defining feature of this part: 1. **Metal Powder Core:** Unlike traditional ferrite inductors, these use a metal alloy powder pressed around the coil. This allows for **soft saturation** characteristics (the inductance drops gradually rather than abruptly). 2. **Magnetic Shielding:** The molded structure naturally provides magnetic shielding, reducing Electromagnetic Interference (EMI) with surrounding components. 3. **High Current Density:** Due to the composite material, it can handle higher peak currents in a smaller footprint compared to standard wire-wound ferrite inductors. --- ### 4. Common Applications This inductor is designed for high-frequency switching environments, such as: * **Voltage Regulator Modules (VRM):** For CPUs and GPUs in laptops. * **DC-DC Converters:** Point-of-Load (POL) power supplies. * **Mobile Devices:** Power management in smartphones and tablets where height (1.5mm) is restricted. * **Automotive Infotainment:** Compact power filtering for on-board electronics. ---