CMT908-V1

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Common Mode Chokes (CMC) are components used in electrical circuits for electromagnetic interference (EMI) suppression, signal isolation, and noise reduction. CMC are usually wound coils of wire that consist of multiple windings that are magnetically coupled to each other. In general, CMC provide a high impedance to common mode noise and a low to medium impedance to differential mode signals, allowing them to provide a good balance between signal isolation and noise rejection.

The CMT908-V1 is a ceramic core common mode choke with multiple windings. It is designed to provide up to 30dB attenuation of EMI signals across a wide frequency range from below 1MHz to 1GHz. This device is most commonly used in automotive and communication systems, for applications such as power line harmonics, signal line noise, and frequency-hopping systems. It has several features that make it an effective tool for EMI suppression.

The CMT908-V1 has two windings, each wound on a single ceramic core. The windings are magnetically coupled to each other and are apt to reject common mode noise, while still passing the desired signal. This design also allows the device to provide good attenuation of EMI signals across a wide frequency range, from below 1MHz to 1GHz. The CMT908-V1 also features a low leakage inductance, making it ideal for use in high-power applications. Additionally, the CMT908-V1 is also RoHS compliant, making it suitable for use in a variety of applications.

The working principle of the CMT908-V1 begins with the two windings being magnetically coupled to each other. This magnetically coupled design allows the CMT908-V1 to have two functionalities; it is able to reject common mode noise, while still passing the desired signal. This is done because the common mode signals, such as radiated EMI signals, are routed through both windings, resulting in an increased inductance and therefore increasing its attenuation effectiveness.

At the same time, the signal that is being transmitted will be routed through just one of the windings, resulting in a reduced inductance and therefore reducing the attenuation effectiveness. This allows the desired signal to pass through the device with little to no adverse effects. The CMT908-V1’s low leakage inductance also ensures that the desired signal is not attenuated due to the device’s magnetic field.

In conclusion, the CMT908-V1 is a ceramic core common mode filter with two windings. It is designed for use in automotive and communication systems, for applications such as power line harmonics and signal line noise. The CMT908-V1’s magnetically coupled design allows it to reject common mode noise and still pass the desired signal. Additionally, the low leakage inductance ensures that the desired signal is not attenuated due to the device’s magnetic field.

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