## Detailed Overview of the CTS3F-R18J The **CTS3F-R18J** is an axial-leaded fixed inductor commonly used in radio frequency (RF) and signal processing applications. It belongs to the **CTS3F series** manufactured by **COILCRAFT** (or similar manufacturers like Central Technologies). --- ### 1. Technical Specifications The following table highlights the core electrical characteristics of this specific component: | Parameter | Value | Details | | :--- | :--- | :--- | | **Inductance** | 0.18 µH | Rated at a specific test frequency (usually 25.2 MHz) | | **Tolerance** | ±5% | Indicated by the "J" suffix | | **DC Resistance (Max)** | 0.15 Ohms | The resistance of the wire used in the coil | | **Rated DC Current** | 1000 mA | Maximum continuous current without damage | | **Self-Resonant Frequency** | 450 MHz | Minimum frequency where it acts as a resistor | | **Q Factor (Min)** | 35 | Efficiency of the inductor at high frequencies | | **Package Style** | Axial Leaded | Through-hole mounting | --- ### 2. Part Number Breakdown Understanding the nomenclature helps identify variations in the series: 1. **CTS3F**: The series identifier (Standard Axial Inductor). 2. **R18**: The Inductance value. "R" acts as a decimal point, meaning $0.18$. 3. **J**: The tolerance code. * **J** = ±5% * **K** = ±10% * **M** = ±20% --- ### 3. Key Features and Applications #### Features: * **Conformal Coating:** Usually protected by an epoxy or phenolic coating to withstand environmental factors and soldering heat. * **High Q Values:** High "Quality Factor" makes it ideal for resonant circuits. * **Color Coding:** Often uses a standard 4-band or 5-band color code system (Silver, Gold, or Black for tolerance/multipliers). #### Typical Applications: * **RF Chokes:** Blocking high-frequency noise while allowing DC to pass. * **Decoupling:** Filtering power supply lines in sensitive electronics. * **Communication Equipment:** Used in oscillators, filters, and impedance matching circuits. * **Consumer Electronics:** TV, radio, and satellite receivers. --- ### 4. Physical Dimensions (Approximate) | Dimension | Size (mm) | | :--- | :--- | | Body Length | 6.0 mm - 7.0 mm | | Body Diameter | 2.5 mm - 3.0 mm | | Lead Length | 25.0 mm - 30.0 mm |