The **CSHB0421R-R47M** is a high-performance, surface-mount (SMD) power inductor commonly used in DC-DC converter applications. It belongs to a class of "molded" or "metal composite" inductors known for high current handling and low acoustic noise. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's specifications: | Segment | Meaning | Detail | | :--- | :--- | :--- | | **CSHB** | Series Name | High-current, shielded metal composite inductor | | **0421** | Dimensions | Approx. 4.0 x 4.0 mm (Footprint) x 2.1 mm (Height) | | **R** | Material/Process | Specific core type or manufacturing revision | | **R47** | Inductance Value | **0.47 µH** (R denotes decimal point) | | **M** | Tolerance | **±20%** | --- ### 2. Key Technical Specifications Based on standard industry data for this footprint and value: * **Inductance:** 0.47 µH * **DC Resistance (DCR):** Typically very low (approx. 8–12 mΩ), which minimizes power loss and heat generation. * **Saturation Current ($I_{sat}$):** The current level where inductance drops by a specific percentage (usually 30%). For this size, it is typically around **10A – 14A**. * **Heat Rating Current ($I_{rms}$):** The continuous current that causes a 40°C temperature rise. Typically around **7A – 9A**. * **Operating Temperature:** Generally rated for **-40°C to +125°C**. --- ### 3. Core Features & Construction The CSHB0421R-R47M uses a **Metal Powder Core** technology. This offers several advantages over traditional ferrite inductors: 1. **Soft Saturation:** Unlike ferrite cores that lose inductance suddenly when over-currented, metal composite cores have a gradual saturation curve. 2. **Magnetic Shielding:** The molded construction naturally shields the component, reducing Electromagnetic Interference (EMI) with neighboring components. 3. **Low Buzz:** The solid molded structure reduces "magnetostriction," significantly lowering the audible humming or buzzing noise during high-frequency switching. --- ### 4. Common Applications Due to its small profile and high current capacity, this part is found in: * **Voltage Regulator Modules (VRM):** For CPUs and GPUs. * **Portable Electronics:** Smartphones, tablets, and laptops. * **DC/DC Converters:** Point-of-load (POL) power supplies. * **Automotive Infotainment:** Compact power modules requiring high efficiency. ---