The **CTS2F-R33K** is a specific model of a **Fixed Inductor** (Choke) belonging to the axial leaded family. It is commonly used in electronic circuits for filtering, decoupling, and power supply applications. --- ## 1. Technical Specifications The part number follows a standard nomenclature. Below are the key electrical and physical characteristics: | Property | Value | Description | | :--- | :--- | :--- | | **Inductance** | 0.33 µH | Measured at 25.2 MHz | | **Tolerance** | ±10% | Indicated by the suffix "K" | | **DC Resistance (DCR)** | 0.14 Ω Max | The resistance of the wire used in the coil | | **Rated Current** | ~1100 mA (1.1A) | Maximum current before overheating or saturation | | **Quality Factor (Q)** | 45 Min | Indicates the efficiency of the inductor | | **Self-Resonant Freq.** | 400 MHz | The frequency at which it stops acting as an inductor | | **Case Style** | Axial Leaded | Cylindrical body with wire leads on both ends | --- ## 2. Key Features and Materials The construction of the CTS2F series typically involves: * **Core Material:** Usually a **Ferrite core** or **Phenolic core** (depending on the specific frequency range). For the 0.33µH value, it is often a phenolic or powdered iron core to handle higher frequencies. * **Coating:** Encapsulated in a flame-retardant epoxy resin (often green or blue) to protect against moisture and mechanical stress. * **Marking:** Identified via a **Color Band Code** similar to resistors, representing the inductance value and tolerance. --- ## 3. Common Applications Due to its low inductance and high resonant frequency, the CTS2F-R33K is used in: 1. **RF Circuits:** Used as a high-frequency choke to block AC noise while allowing DC to pass. 2. **EMI/RFI Filtering:** Reducing electromagnetic interference in signal lines. 3. **Decoupling:** Filtering power supply rails for integrated circuits (ICs). 4. **Oscillators:** Serving as a frequency-determining component in LC circuits. --- ## 4. Part Number Breakdown Understanding how to read the part number: * **CTS2F:** Series identifier (Conformal Coated Axial Inductor). * **R33:** Represents the value. "R" acts as a decimal point. $0.33$ Microhenries ($\mu H$). * **K:** Tolerance code ($J = \pm5\%$, $K = \pm10\%$, $M = \pm20\%$).