What is an SQ common-mode inductor?

SQ common-mode inductor, making noise nowhere to hide

What is an SQ common-mode inductor?

The SQ common-mode inductor is an inductive component used to suppress common-mode interference. Common-mode interference refers to the interference signals that exist simultaneously on two or more signal lines and have the same direction.

The common-mode inductor of SQ is usually composed of two or more windings wound on the same magnetic core. These windings have the same winding direction, so for differential-mode signals (signals with opposite directions on the two signal lines), the inductors cancel each other out and have almost no impedance. However, for common-mode signals, the inductors add up to each other, generating a larger impedance, thereby suppressing common-mode interference.

The application of SQ common-mode inductors:

The SQ common-mode inductor is widely used in various electronic devices to suppress common-mode interference and enhance the anti-interference ability and electromagnetic compatibility (EMC) performance of the equipment. Common applications include:

Power input terminal: Used to suppress common-mode noise on the power line.

Data cable interface: Such as USB, HDMI, Ethernet, etc., used to suppress common-mode noise on the data cable.

Audio and video equipment: Used to suppress common-mode noise in audio and video signals, thereby improving audio quality and image quality.

Communication equipment: Used to suppress common-mode noise on communication lines and improve communication quality.

Industrial control equipment: Used to suppress common-mode noise in industrial environments and enhance the reliability of the equipment.

Parameters to be considered when selecting SQ common-mode inductors:

Common-mode impedance (Zcm): The impedance to common-mode signals at a specific frequency. The higher the value, the better.

Common-mode impedance (Zdm): The impedance for common-mode signals. The lower the value, the better.

Rated Current (Irated): The maximum direct current that the inductor can withstand.

Inductance (L): The inductance value of the inductor, usually referring to the inductance value of each winding.

Direct Current Resistance (DCR): The direct current resistance of the winding. The lower the value, the better.

Working frequency range: The inductor can effectively suppress the frequency range of common-mode noise.

Size: The physical dimensions of the inductor.

Voltage tolerance: The maximum voltage that an inductor can withstand.

The SQ common-mode inductor is a common-mode inductor with a square magnetic core. It features high common-mode impedance, low differential-mode impedance, high saturation current, and excellent electromagnetic shielding performance. It is widely used in various electronic devices to suppress common-mode interference and enhance the anti-interference ability and electromagnetic compatibility of the equipment. When selecting an SQ common-mode inductor, it is necessary to choose the appropriate parameters based on the specific application requirements.

We hope the above information will help you understand the SQ common-mode inductor. If you have any other questions, please feel free to ask at any time.