The **CM322522-R18M** is a high-frequency chip inductor commonly used in surface-mount technology (SMT) applications. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. General Specifications The part number follows a standardized naming convention that describes its physical size and electrical properties. | Parameter | Specification | Description | | :--- | :--- | :--- | | **Inductance** | 0.18 µH | Rated at 25.2 MHz | | **Tolerance** | ±20% | Indicated by the "M" suffix | | **Case Size** | 3225 (Metric) / 1210 (EIA) | 3.2mm x 2.5mm | | **Core Material** | Ferrite / Wire-wound | Provides high Q-factor and stability | | **Mounting Type** | Surface Mount (SMD) | Designed for automated PCB assembly | --- ### 2. Electrical Performance Inductors in this category are designed for high-frequency stability and power efficiency in small circuits. * **Rated Current ($I_{dc}$):** Typically around **450 mA**. This is the maximum continuous current the inductor can handle without overheating or saturating the core. * **DC Resistance (DCR):** Usually around **0.40 $\Omega$ (Max)**. Lower DCR is preferred to minimize power loss as heat. * **Self-Resonant Frequency (SRF):** Approximately **550 MHz**. Above this frequency, the component acts more like a capacitor than an inductor. * **Q-Factor:** Generally has a minimum value of **30** at the test frequency, indicating high efficiency and low energy loss. --- ### 3. Part Number Decoding Understanding the nomenclature helps in identifying substitutes or similar parts: | Code Segment | Meaning | | :--- | :--- | | **CM** | Series Prefix (Commonly Bourns or similar manufacturers) | | **322522** | Dimensions (3.2mm length x 2.5mm width x 2.2mm height) | | **R18** | Inductance value: 0.18 microhenries (µH) | | **M** | Tolerance code (M = ±20%, K = ±10%, J = ±5%) | --- ### 4. Common Applications * **RF Circuits:** Used in impedance matching and signal filtering. * **Communication Equipment:** Found in mobile phones, GPS modules, and Wi-Fi routers. * **Power Management:** Utilized in small DC-DC converters for decoupling and noise suppression.