The **CSHB0421R-R22M** is a high-performance, surface-mount (SMD) power inductor commonly used in DC-DC converters and high-current power supplies. It belongs to a category of shielded composite inductors known for high efficiency and compact size. ### 1. General Specifications Based on the part numbering convention, here are the primary technical characteristics: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.22 µH (R22) | | **Tolerance** | ±20% (M) | | **Case Size** | Approx. 4.0 x 4.0 x 2.1 mm | | **Material** | Metal Alloy / Carbonyl Powder Core | | **Shielding** | Magnetically Shielded | --- ### 2. Key Features * **High Current Handling:** Designed to manage high saturation currents ($I_{sat}$) without sharp drops in inductance. * **Low DCR (DC Resistance):** Minimizes power loss and heat generation during operation. * **Low Acoustic Noise:** The molded construction reduces the physical vibration (buzzing) often heard in standard inductors. * **Magnetically Shielded:** Prevents Electromagnetic Interference (EMI) from affecting surrounding sensitive components on the PCB. --- ### 3. Application Use Cases This specific inductor is typically found in: 1. **Voltage Regulator Modules (VRM):** Powering CPUs or GPUs. 2. **Portable Electronics:** Smartphones, tablets, and laptops where space is limited. 3. **DC-DC Converters:** Point-of-load (POL) converters where high switching frequencies are used. 4. **Battery Powered Devices:** Where high efficiency is critical to extend battery life. --- ### 4. Part Number Breakdown The nomenclature `CSHB0421R-R22M` can be decoded as follows: | Segment | Meaning | | :--- | :--- | | **CSHB** | Series Name (High current, molded type) | | **0421** | Physical Dimensions (4.4mm length x 4.2mm width x 2.1mm height) | | **R** | Standardized Internal Code | | **R22** | Inductance Value (0.22 microhenries) | | **M** | Tolerance (±20%) |