RN143-1-02-47M

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Common Mode Chokes are mainly used to reduce the potential damage caused by electromagnetic interference (EMI), often by passing current through it that creates a magnetic field, and thus blocking high-frequency noises, while allowing low-frequency common mode signals to pass. The RN143-1-02-47M is one such example of this type of choke.

The RN143-1-02-47M is composed of a coiled wire winding with a ferrite core at its centre. The ferrite core is made of a special material with a high electrical resistance along with a low magnetic permeability, which allows it to block common mode high frequency (CMHF) noise from sourcing from the device it’s protecting. It consists of two windings, isolated from each other with the difference in the currents being passed through each of them used to cancel out the noise being transferred into the downstream components. The wire is made from Litz wire, which is formed by winding thin strands of enameled copper wire in a litz configuration to give it a low impedance and provide high-frequency suppression. The number of turns used on each winding is set to the correct ratio for the most effective noise reduction.

In terms of its application fields, Common Mode Chokes such as the RN143-1-02-47M are typically used to protect sensitive electronics from radio frequency interference (RFI). This type of remote sensing device or chokes help to disrupt CMHF noise in environments with a high level of electric or magnetic interference, and are often used in automotive, aerospace, and consumer electronics applications. Other typical applications where Common Mode Chokes are used include medical systems, office equipment, and wireless communication networks.

In addition to providing basic EMI protection, Common Mode Chokes such as the RN143-1-02-47M also have the added benefit of offering voltage regulation to prevent damage in sensitive downstream components. Its two windings are typically set at unequal turns ratio in order to limit the differential signal voltage, providing enhanced protection for sensitive components connected to the chokes.

The way Common Mode Chokes work in principle is fairly simple. When a high-frequency signal passes through the coil, the electromagnetic field is formed by the alternating current causes the wire windings to act as an inductor. As the alternating current passes from the source to the load, the choke creates an opposing EMF which blocks the high-frequency signal from passing through the choke and thus reduced the amount of EMI noise generated. This will ensure components downstream of the choke are safely protected from the interference.

In conclusion, the RN143-1-02-47M, a type of Common Mode Choke, is an effective tool for reducing EMI noise in various applications such as automotive, aerospace, and consumer electronics. Its use of a ferrite core and two Litz wire windings gives it an inductive characteristic that blocks high-frequency noise while allowing low-frequency signals to pass. In addition, Common Mode Chokes help to provide voltage regulation to sensitive components downstream by limiting the differential signal voltage.

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