MCF12102H900-T

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Common mode chokes are electrical devices used to filter and suppress electromagnetic noise as well as common-mode noise. These components are mainly housed in a cylindrical casing with either one or two coils arranged in series to offer wide bandwidth and high common-mode suppression. The MCF12102H900-T is a common-mode choke with a wide application field and its principle of work.

The MCF12102H900-T common-mode choke is one of the most common types. It is composed of one or two coils made of a ferrite material and a ceramic housed in a black cylindrical casing. These components are mainly used for high-speed communications, typically in the VHF frequency range, such as modem and medium power radio receivers and transmitters. It is also used for filtering power lines and for suppressing noise on RS-422/RS-485 lines, with a high common-mode voltage rejection ratio of more than 15 dBV.

The working principle of the MCF12102H900-T includes two main components. The first part is the magnetic core, which is composed of ferrite material and ceramic material. This core has two inversely wound coils arranged in series on it. The second part is the terminal plate, which is used to connect and secure the coil ends. The magnetic core functions as a low impedance path and provides for high mutual inductance between the two coils.

The working principle of the MCF12102H900-T common-mode choke is based on the Faraday\'s law of induction. According to this law, when a current passes through the two coils, a magnetic field is produced around the core, and this in turn induces an induced current in the second coil. This induced current acts to counter the original current, resulting in a decrease in the current at its point of origin. This decrease of current effectively filters out the unwanted electromagnetic interference from the power lines in order to reduce noise and improve the signal quality.

Furthermore, the high common-mode voltage rejection ratio of the MCF12102H900-T helps in shielding against external electromagnetic interference. The two coils of the device cancel out the common mode currents due to the symmetry of the current in each coil, thus providing higher attenuation of the common mode currents compared to that of the differential mode currents. This helps in improving the signal integrity and in reducing the susceptibility of the system to EM interference.

In conclusion, the MCF12102H900-T is a common mode choke with a wide application field and its working principle is based on the Faraday\'s law of induction. These components offer high common-mode suppression and have a high common-mode voltage rejection ratio which helps in shielding against external EM interference.

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