The **125CDMCCDS-R82MC** is a high-current, surface-mount (SMD) power inductor typically manufactured by **Sumida**. It belongs to the CDMCC series, which is known for its metal composite core construction. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its physical and electrical characteristics. | Parameter | Value / Description | | :--- | :--- | | **Inductance** | 0.82 µH | | **Tolerance** | ±20% (indicated by 'M') | | **Case Size** | 12.5 x 12.5 x 5.4 mm (approx.) | | **Core Material** | Carbonyl Iron / Metal Composite | | **DCR (Direct Current Resistance)** | Very low (typically < 2.5 mΩ) | | **Saturation Current ($I_{sat}$)** | High (typically > 30A) | --- ### 2. Key Features The construction of this specific part offers several advantages for modern electronics: * **Metal Composite Technology:** Unlike traditional ferrite inductors, these use iron powder pressed into shape. This allows for **soft saturation**, meaning the inductance doesn't drop abruptly when the current increases. * **Magnetic Shielding:** The molded structure naturally shields the component, reducing Electromagnetic Interference (EMI) with neighboring components. * **High Efficiency:** Due to the extremely low DCR (Direct Current Resistance), it minimizes power loss as heat. * **Stability:** It maintains stable performance across a wide temperature range (usually up to 125°C or 155°C depending on the specific grade). --- ### 3. Common Applications This inductor is designed for high-power density circuits where space is limited but current requirements are high: 1. **Voltage Regulator Modules (VRM):** Used in CPU and GPU power supplies on motherboards. 2. **DC/DC Converters:** Found in point-of-load (POL) converters for industrial and consumer electronics. 3. **Battery Powered Devices:** High-efficiency power management for portable devices. 4. **Automotive Electronics:** Used in ADAS modules and infotainment systems (if AEC-Q200 qualified). --- ### 4. Part Number Breakdown ```text 125CDMCCDS - R82 M C | | | | | | | | | +-- Internal Code/Packaging | | | +---- Tolerance (M = ±20%) | | +-------- Inductance (R82 = 0.82 µH) | +---------------- Series Name (Metal Composite) +--------------------- Size Code (approx. 12mm x 12mm) ```