The **CDMC104NP-R56M** is a high-power, surface-mount (SMD) inductor manufactured by **Sumida Corporation**. It belongs to the CDMC series, which is characterized by its use of metal carbonyl powder, providing high saturation current and low core loss. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the component: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.56 µH | | **Tolerance** | ±20% (M) | | **DC Resistance (DCR)** | 1.80 mΩ (Typical) / 2.10 mΩ (Max) | | **Saturation Current (Isat)** | 35.0 A (Approx. 30% drop in inductance) | | **Temperature Rise Current (Irms)** | 23.0 A (Approx. 40°C rise) | | **Dimensions (LxWxH)** | 11.5 x 10.4 x 4.0 mm | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Breakdown of the Part Number The alphanumeric code provides specific details about the component's construction: * **CDMC**: Series name (Metal Composite Core). * **104**: Size code (approx. 10mm x 10mm footprint, 4mm height). * **NP**: Standard packaging/termination style. * **R56**: Inductance value (R = decimal point; 0.56 microhenries). * **M**: Tolerance (±20%). --- ### 3. Core Features and Benefits The CDMC104NP-R56M is designed for high-performance power electronics: * **Metal Composite Construction:** Unlike traditional ferrite cores, the metal powder core results in a "soft saturation" characteristic. This prevents the inductor from losing all inductance suddenly during current spikes. * **Low DCR:** The very low DC resistance (1.8mΩ) ensures high efficiency by minimizing power loss through heat. * **Low Acoustic Noise:** The molded construction reduces buzzing sounds common in high-frequency switching. * **Shielded Design:** It is magnetically shielded, which reduces Electromagnetic Interference (EMI) with neighboring components on the PCB. --- ### 4. Common Applications This inductor is typically found in high-current DC-DC converter circuits, such as: 1. **Voltage Regulator Modules (VRMs):** Used in CPU/GPU power supplies for servers and high-end PCs. 2. **Point of Load (POL) Converters:** Used in telecommunications equipment. 3. **Automotive Electronics:** Infotainment systems and LED lighting drivers. 4. **Battery Powered Devices:** High-capacity power banks or industrial handhelds.