The **MCS0420-R47MN2** is a surface-mount (SMD) power inductor commonly used in DC-DC converter circuits. It belongs to the category of "Molded Power Inductors," which are known for their high current density and low acoustic noise. --- ### 1. Technical Specifications The part number provides specific details about its electrical and physical characteristics. | Parameter | Specification | Description | | :--- | :--- | :--- | | **Inductance** | 0.47 µH | The nominal inductance value. | | **Tolerance** | ±20% (M) | The allowable deviation from the nominal inductance. | | **DC Resistance (DCR)** | ~4.0 mΩ (Max) | The resistance of the internal copper coil. | | **Saturation Current (Isat)** | ~15.5 A | Current at which inductance drops by 30%. | | **Heating Current (Irms)** | ~12.0 A | Current that causes a 40°C temperature rise. | | **Case Size** | 0420 (4.0 x 4.0 x 2.0 mm) | Physical dimensions of the component. | --- ### 2. Key Features and Construction * **Molded Construction:** The coil is encapsulated in a metallic iron powder composite. This design provides "soft saturation" characteristics, meaning the inductance doesn't drop off sharply when the current increases. * **Magnetic Shielding:** Because the body is made of magnetic powder, it is naturally shielded, which reduces Electromagnetic Interference (EMI) with neighboring components. * **Low Profile:** The "20" in the 0420 code indicates a maximum height of approximately 2.0 mm, making it ideal for slim electronics like smartphones or tablets. --- ### 3. Application Use Cases This specific inductor is typically found in the following power management stages: 1. **Buck Converters:** Used as the energy storage element in step-down regulators. 2. **GPU/CPU Power Rails:** Providing high current at low voltages for processors. 3. **Portable Electronics:** Used in SSDs, laptops, and mobile devices due to its small footprint and high efficiency. --- ### 4. Part Number Breakdown ```text MCS 0420 - R47 M N 2 | | | | | | | | | | | +-- Height (approx 2.0mm) | | | | +---- Internal Code/Material | | | +------ Tolerance (M = ±20%) | | +--------- Value (R47 = 0.47 microhenries) | +---------------- Size (4.0mm x 4.0mm) +--------------------- Series Name (Molded Inductor) ```