The part number **125CDMCCDS-R47MC** refers to a high-current, low-profile power inductor typically manufactured by **Sumida**. These components are widely used in DC-DC converters for power management in automotive and industrial applications. --- ### 1. Specification Overview The part number can be broken down to understand its physical and electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% (indicated by 'M') | | **Core Material** | Carbonyl Powder (Metal Composite) | | **Shielding** | Magnetically Shielded | | **Series** | 125CDMCCDS | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Electrical Characteristics The "125" series usually indicates a specific frame size (approx. 13.8mm x 12.6mm). Below are the typical performance metrics for this specific value: * **Inductance (L):** 0.47 µH at 100kHz. * **DC Resistance (DCR):** Extremely low (typically < 2.0 mΩ), which minimizes power loss and heat generation. * **Saturation Current (Isat):** Very high (often exceeding 40A-50A). Because it uses a metal composite core, it features "soft saturation" characteristics, meaning the inductance drops gradually rather than abruptly as current increases. * **Temperature Range:** Typically rated for operation between -55°C and +150°C (Automotive Grade). --- ### 3. Key Features and Applications #### Features * **High Efficiency:** Low DCR ensures minimal self-heating. * **Compact Design:** Low profile height (usually around 5.4mm) for space-constrained boards. * **Low Acoustic Noise:** The molded construction reduces "coil whine" compared to traditional ferrite inductors. * **AEC-Q200 Qualified:** Usually compliant with automotive stress-test standards. #### Applications * **Automotive:** LED headlamp drivers, ADAS systems, and Infotainment power supplies. * **Computing:** Voltage Regulator Modules (VRM) for high-end CPUs and GPUs. * **Industrial:** High-current DC-DC converters and distributed power systems. --- ### 4. Naming Convention Breakdown `125CDMCCDS` | `-` | `R47` | `M` | `C` :--- | :---: | :--- | :--- | :--- **Series Code** | | **Value** | **Tolerance** | **Packaging** Size/Construction | | 0.47 Microhenries | ±20% | Carrier Tape