SMD Common-mode chokes are often used to filter common-mode electromagnetic interference signals in switching power supplies. In the board design, the common-mode inductor also plays the role of EMI filtering, which is used to suppress the electromagnetic wave generated by high-speed signal lines. Meisongbei's SMD CM Chokes by Signal Transformer are ideal for EMC suppression of differential mode noise found on network signals such as Ethernet, CAN bus and USB interfaces.

In general, pay attention to select the frequency band required to be filtered at the same time, the larger the common-mode impedance is, the better. Therefore, when selecting the common-mode inductor, it is necessary to look at the device data, mainly according to the impedance frequency curve.