The **CF322513-R39K** is a surface-mount (SMD) wire-wound chip inductor. It is designed for use in high-frequency circuits where stability and precision are required in a small footprint. --- ## 1. Technical Specifications The part number follows a standard naming convention that defines its physical and electrical properties. | Parameter | Specification | Description | | :--- | :--- | :--- | | **Inductance** | 0.39 µH | The "R39" represents the decimal 0.39. | | **Tolerance** | ±10% | Indicated by the "K" suffix. | | **Case Size** | 3225 (Metric) / 1210 (EIA) | Dimensions: 3.2mm x 2.5mm. | | **Core Material** | Ferrite / Wire-wound | Offers high Q (Quality factor) and current handling. | | **Standard** | AEC-Q200 | Often qualified for automotive/industrial reliability. | --- ## 2. Part Number Breakdown Understanding the alphanumeric code helps in identifying the component's capabilities: 1. **CF**: Typically denotes the manufacturer's series (e.g., Bourns or similar generic manufacturers). 2. **3225**: Physical dimensions (3.2mm length x 2.5mm width). 3. **13**: Profile height (approx. 1.3mm). 4. **R39**: Inductance value (R acts as the decimal point: 0.39 microhenries). 5. **K**: Tolerance code (K = ±10%, J = ±5%, M = ±20%). --- ## 3. Key Applications Because this is a wire-wound inductor with a ferrite core, it is commonly found in: * **RF Tuning:** Used in communication equipment for frequency selection. * **Filtering:** Decoupling power supply lines to prevent electromagnetic interference (EMI). * **Signal Processing:** High-speed data lines requiring signal integrity. * **Automotive Electronics:** Sensors and control units due to its robust 1210 package size. --- ## 4. Advantages & Limitations ### Pros: * **High Resonance Frequency:** Suitable for high-speed switching and RF. * **Robustness:** Wire-wound construction is generally more durable than multilayer types for current surges. * **Standard Footprint:** Easy to source and fits on standard PCB pads. ### Cons: * **Size:** Larger than 0402 or 0603 multilayer chips. * **EMI:** As a wire-wound part, it may emit more stray magnetic fields than shielded inductors.