The **7G-TQ3-R** is a specific electronic component primarily recognized as a **Toroidal Common Mode Choke** (Inductor) manufactured by companies like **Coilmaster Electronics** or similar power component specialists. These parts are essential for EMI (Electromagnetic Interference) suppression in power supply circuits. --- ### 1. Technical Specifications Below are the typical technical parameters for the 7G-TQ3 series: | Feature | Specification | | :--- | :--- | | **Component Type** | Common Mode Choke / Toroidal Inductor | | **Mounting Type** | Through-Hole (THT) | | **Core Material** | Ferrite (high permeability) | | **Configuration** | Dual winding (4 pins) | | **Application** | AC/DC Power Lines, EMI Filters | | **Operating Temp** | -40°C to +125°C (typical) | --- ### 2. Key Electronic Functions The 7G-TQ3-R serves three primary roles in an electronic assembly: 1. **Noise Suppression:** It filters out high-frequency "Common Mode" noise—interference that travels in the same direction on both power lines—without affecting the actual power signal. 2. **Magnetic Stability:** The toroidal (ring-shaped) design ensures that the magnetic field is contained within the core, reducing stray electromagnetic fields that could interfere with nearby components. 3. **Current Handling:** Designed with thick copper wire to handle significant AC or DC currents while maintaining low DC resistance (DCR) to prevent overheating. --- ### 3. Physical Construction The part is identified by several physical characteristics: * **Toroidal Core:** A circular ferrite core that provides high efficiency. * **Base/Header:** Usually mounted on a plastic base (TQ style) with 4 pins to ensure stability on the PCB. * **Winding:** Two separate coils wound in a way that their magnetic fields cancel out for differential signals but add up for common-mode noise. ### 4. Typical Application Circuit In a power supply, the 7G-TQ3-R is placed at the input stage: ```text [AC Input] ---- [Fuse] ---- [7G-TQ3-R Choke] ---- [Rectifier] ---- [DC Output] | (Filters Noise) ``` ---