The **CM322522-R47ML** is a specific surface-mount (SMD) wire-wound chip inductor. It is commonly used in electronic circuits for filtering, decoupling, and energy storage in high-frequency applications. ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's specifications: | Code | Segment | Meaning | | :--- | :--- | :--- | | **CM** | Series Prefix | Wire-wound chip inductor (Standard series) | | **322522** | Case Size | Dimensions: 3.2mm x 2.5mm x 2.2mm (EIA 1210) | | **R47** | Inductance Value | 0.47 µH (microhenries) | | **M** | Tolerance | ±20% | | **L** | Packaging | Tape & Reel (Usually Lead-Free/RoHS compliant) | --- ### 2. Key Technical Specifications Below are the typical electrical characteristics for this specific part: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **Case Size (EIA)** | 1210 | | **DC Resistance (DCR)** | ~0.35 Ω (Max) | | **Rated Current (Idc)** | ~450 mA | | **Self-Resonant Frequency** | ~350 MHz | | **Operating Temp** | -40°C to +125°C | --- ### 3. Construction and Materials The "Wire-Wound" nature of this inductor is critical for its performance: * **Core Material:** Usually ferrite or ceramic. Ferrite cores allow for higher inductance in a smaller package. * **Winding:** Fine copper wire is wound around the core and terminated at the metallic pads. * **Molding:** The component is typically encapsulated in a resin mold to provide physical protection and heat resistance during soldering. --- ### 4. Typical Applications The CM322522 series is versatile and found in: 1. **Power Supply Circuits:** Used as a filter to smooth out ripples in DC-DC converters. 2. **Signal Lines:** Helps eliminate High-Frequency (HF) noise in communication equipment. 3. **Consumer Electronics:** Found in smartphones, tablets, and hard drives due to its small footprint. 4. **RF Circuits:** Due to its high self-resonant frequency, it is suitable for moderate RF filtering. --- ### 5. Equivalent Replacement Guide If you are looking for a substitute, ensure the following parameters match or exceed the original: * **Footprint:** Must be 1210 (3225 Metric). * **Current Rating:** Should be equal to or higher than 450mA to prevent overheating. * **DCR:** Should be equal to or lower than the original to maintain efficiency. ---