The **CTS4F-R12K** is a specific electronic component belonging to the **Fixed Inductor** category, typically manufactured by companies like Central Technologies. It is an axial-lead, molded shielded inductor designed for general-purpose filtering and RF applications. ### 1. General Specifications The part number follows a specific nomenclature that defines its electrical characteristics. | Parameter | Specification | | :--- | :--- | | **Component Type** | Fixed Inductor (Axial Leaded) | | **Inductance** | 0.12 µH | | **Tolerance** | ±10% (Indicated by the 'K') | | **Core Material** | Phenolic or Powdered Iron (depending on series) | | **Shielding** | Shielded (Reduces electromagnetic interference) | | **Mounting Type** | Through-hole | --- ### 2. Breakdown of the Part Number Understanding the code helps in identifying substitutes or variations: * **CTS4F:** The series designation (Shielded, Axial Inductors). * **R12:** Represents the inductance value. The 'R' acts as a decimal point. (0.12). * **K:** Represents the tolerance code. * *K = ±10%* * *J = ±5%* * *M = ±20%* --- ### 3. Electrical Characteristics Beyond the base inductance, these parts are characterized by their performance in high-frequency circuits. | Feature | Value / Description | | :--- | :--- | | **Q Factor (Min)** | Typically 40-50 at test frequency | | **SRF (Self Resonant Frequency)** | High frequency (usually > 500 MHz for low µH values) | | **DC Resistance (DCR)** | Very low (Max ~0.08 - 0.15 Ω) | | **Rated DC Current** | Relatively high for its size (often > 1000 mA) | --- ### 4. Typical Applications The CTS4F-R12K is commonly used in circuits where space is limited and electromagnetic compatibility (EMC) is a concern: * **RF Coupling/Decoupling:** Used to block high-frequency noise in communication equipment. * **Power Supply Filters:** Minimizing ripple in DC-DC converters. * **Signal Processing:** Frequency selection and impedance matching. * **EMI Suppression:** The shielded design prevents the inductor from radiating energy to nearby components. --- ### 5. Physical Dimensions As an axial leaded component, it resembles a resistor in shape. * **Body Length:** ~6.35 mm (0.250 inches) * **Body Diameter:** ~2.41 mm (0.095 inches) * **Lead Diameter:** ~0.51 mm (24 AWG)