RT8122-16-4M0

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Common Mode Chokes

Common mode chokes can be used to filter out high frequency common mode interference signals from the medium frequency and low frequency electrical equipment, providing a significantly improved level of filtering and a reduction in the amount of current that gets transferred onto the signal line. RT8122-16-4M0 is a common mode choke which can provide effective shielding performance.

Application Field

The RT8122-16-4M0 is designed for use in a wide variety of applications, including: industrial control, automotive, medical, computer, communication, measurement and navigation systems, as well as military and aerospace applications. It can be used in high frequency signal lines, such as USB and Ethernet cables, as well as in isolated power and data systems. It is commonly used to improve electrical isolation, reduce ground loop interference and protect sensitive circuits from ESD (electrostatic discharge) and other transient surges.

Working Principle

The RT8122-16-4M0 common mode choke consists of two core components: an inductor and a capacitor. The inductor is a coil of wire which can block high-frequency common-mode signals from passing through, while the capacitor dissipates high-frequency differential mode signals which may cause interference. When combined together, the inductor and capacitor form a filter that can reduce EMI (electromagnetic interference) from entering the signal line, and can reduce the amount of current that gets transferred onto the signal line.

The inductor is made of several turns of copper wire, and the type of core used is usually ferrite. Depending on the application, the inductance can range from 1µH to 100µH, with 1µH being the most common. The inductance serves two primary functions: it limits the amount of current flowing through the choke by introducing an impedance, and it changes the phase of the current so that common mode signals are out of phase with each other. This creates a form of “shielding” that reduces the amount of signal that reaches the sensitive device.

The capacitor is an electronic component which allows current to pass through it, and is usually made of a dielectric material. The type of dielectric material used will depend on the intended application. The capacitor helps to “shunt” high-frequency differential mode signals away from the signal line, so that they do not interfere with the lower frequency common mode signals. The capacitor also helps to limit the amount of current flowing through the choke.

When the RT8122-16-4M0 is used in a circuit, it can provide effective isolation and filtering of high frequency interference signals, and reduce ground loop interference. It can also reduce the amount of current that gets transferred onto the signal line, and help to improve the signal-to-noise ratio. In addition, it can provide ESD protection for sensitive circuits.

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