The **CTC4F-R12K** is a specific type of **Fixed Inductor** (Choke) commonly used in electronic circuits for filtering and energy storage. It belongs to the axial-lead inductor family, often recognized by its resemblance to a resistor. Below is a detailed breakdown of its electronic specifications and characteristics. ### 1. Technical Specifications The part number follows a standard naming convention for axial inductors. Here are the core parameters: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.12 µH (Microhenries) | | **Tolerance** | ±10% (Indicated by the 'K' suffix) | | **Core Material** | Phenolic or Ferrite (depending on specific sub-series) | | **Form Factor** | Axial Leaded (Through-hole) | | **Operating Temp** | -55°C to +125°C | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying equivalent parts: * **CTC4F**: The series designation (typically 4mm diameter body, "F" often denotes Lead-Free/RoHS compliant). * **R12**: The inductance value. "R" acts as the decimal point. $R12 = 0.12$ units. * **K**: The tolerance code. $K = \pm10\%$. ($J = \pm5\%$, $M = \pm20\%$). --- ### 3. Key Electronic Functions The CTC4F-R12K performs several critical roles within a circuit: 1. **EMI/RFI Filtering**: Because it has a very low inductance (0.12 µH), it is highly effective at filtering out high-frequency noise while allowing DC or lower-frequency signals to pass. 2. **Impedance Matching**: Used in RF (Radio Frequency) circuits to match the impedance between different stages of an amplifier or antenna system. 3. **Decoupling**: Prevents high-frequency signals from traveling through the power supply lines to other sensitive components. --- ### 4. Physical Characteristics * **Color Coding**: These inductors often use a color-band system similar to resistors to denote value and tolerance. * **Coating**: Usually encapsulated in epoxy resin to protect the windings from moisture and mechanical stress. * **Size**: Compact "small signal" size, making it suitable for high-density PCB layouts. --- ### 5. Common Applications * **RF Communications**: Transmitters and receivers. * **Computing**: High-speed signal lines. * **Consumer Electronics**: Oscillators and signal processing modules. ---