RN143-4-02-3M9

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Common Mode Chokes, particularly RN143-4-02-3M9, are electromechanical devices for reducing or eliminating common mode current flow in an electrical system. It is a widely used application in power supplies, automotive electronics, robotics, communication systems and medical electronics.

A common mode choke consists of two or more coils wound in a five- or six-leg configuration and wrapped around a ferrite core. They are used to stop or limit the amount of high-frequency alternating (AC) or unbalanced current flow in a circuit. In many cases, they are used together with an air core inductor to provide some damping and additional signal filtering. The coil windings can either have a symmetrical or asymmetrical distribution, depending on the application.

A CN143-4-02-3M9 application is one where the inductance (L) required is between 6.5 mH to 8.5 mH. This particular model has a rated current of 1.6 A and a DC resistance of just 0.11 ohms. Its external dimensions are in the range of 15 mm diameter and 17.5 mm length. It is constructed with ferrite material and has an operating temperature of -40 to +85°C.

The working principle of the CN143-4-02-3M9 is based on the way it limits current flow in a circuit. By using a combination of symmetric and asymmetric winding and the material of the core, it creates an inductive “leakage” field. This field opposes any variations in the current flow and reduces or eliminates it. The higher the inductance value of the common mode choke, the more suppression is provided.

In addition to limiting current flow, common mode chokes can be used in other ways as well. For example, they can be configured to provide a signal-filtering function. By combining different values of inductance or resistance, they can be used to filter out unwanted noise or frequencies from signals. In power supplies, they can be used to reduce the effects of electromagnetic interference (EMI) on the system.

Common mode chokes, such as the CN143-4-02-3M9, are a very important component in many electrical systems. They are used for reducing or eliminating common mode current flow, signal filtering, and providing additional damping or EMI reduction. This type of device is very versatile and can be used in a wide range of applications, making them an essential part of any electrical system.

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