The **CTC3F-R39K** is a specific electronic component belonging to the **fixed inductor** family, specifically an axial leaded inductor. These are commonly used in power supplies, signal filtering, and decoupling applications. --- ### 1. Technical Specifications The part number follows a standardized naming convention used by manufacturers like Central Technologies. | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.39 µH (Microhenries) | | **Tolerance** | ±10% (Indicated by the "K") | | **Construction** | Axial Leaded (Conformal Coated) | | **Core Material** | Phenolic or Ferrite (depending on specific series) | | **Mounting Type** | Through-hole | --- ### 2. Part Number Breakdown Understanding the alphanumeric code helps identify its characteristics: * **CTC3F**: The series identifier. "CTC" represents the manufacturer/product line, and "3F" typically denotes the physical size and package type (Small axial). * **R39**: The inductance value. The "R" acts as a decimal point. $0.39$ units. * **K**: The tolerance code. In the electronic industry, $K = \pm10\%$. --- ### 3. Key Electronic Characteristics When integrating the CTC3F-R39K into a circuit, engineers focus on these three primary behaviors: 1. **Direct Current Resistance (DCR):** This component has a very low DCR, meaning it allows DC current to pass with minimal power loss as heat. 2. **Self-Resonant Frequency (SRF):** Because it is a low-inductance part (0.39 µH), it typically has a high SRF, making it suitable for high-frequency RF (Radio Frequency) filtering. 3. **Current Rating:** It is designed to handle a specific "Rated DC Current" before the wire overheats or the core saturates. --- ### 4. Common Applications * **RF Chokes:** Used to block high-frequency alternating current (AC) while allowing low-frequency direct current (DC) to pass. * **Decoupling:** Placed near IC power pins to filter out high-frequency noise from the power supply lines. * **Oscillators:** Used in LC (Inductor-Capacitor) circuits to determine specific frequencies.