B82725J2402N020

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Common Mode Chokes, also known as CM chokes, are devices are used to suppress the transmission of unwanted interference, commonly referred to as Electromagnetic Interference (EMI), from a device or power source to another component. The B82725J2402N020 is an example of a common mode choke. This device is a toroidal choke specifically designed to suppress both conducted and radiated emissions in a wide range of applications.

The most common applications for common mode chokes include low frequency noise suppression, power line noise suppression, radio frequency interference (RFI) suppression, and clock line disturbances, as well as other similar uses. In these applications, the B82725J2402N020 works by blocking the high frequency electrical or magnetic energy that create EMI. It achieves this by using two magnetically linked inductors, resulting in complete suppression of common mode currents above a certain frequency. When the device is connected to the power source or signal path, it effectively reduces the level of EMI without adding too much resistance to the power path.

This common mode choke is a surface-mount device specifically designed to suppress both conducted and radiated emissions in a wide range of applications. The B82725J2402N020 has a wide operating temperature range from -40°C to +85°C, and an insulation voltage of 1080VDC. Its rated inductance can be set from 0.20 to 22mH, with a maximum DCR of 8.0 Ω. In addition, the device has an effective shielding capability up to 117dB of EMI reduction at 10MHz.

The working principle of this common mode choke is based on an induction principle in which current passes through two magnetically linked windings. It works by creating a balanced inductive field such that any common mode signal that tries to pass through the choke is efficiently attenuated. The current passing through the windings creates an inductance of the choke due to the self-inductance of the coils, which makes it difficult for the common mode signal to pass through.

As stated, the B82725J2402N020 is a toroidal common mode choke designed for applications that require good attenuation above 10MHz. The device is highly effective in controlling high frequency noise on power and signal lines as well as suppressing noise caused by differential harmonics created by nearby switching power supplies.

Common mode chokes such as the B82725J2402N020 are sometimes referred to as common mode filters, as they can also be used to effectively filter out certain unwanted noise in the frequency range for which they have been designed. Besides serving as a noise filter, these chokes also impose some voltage impedance and signal line isolation. In short, they provide good noise suppression and offer both electrical and magnetic isolation between two points.

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