How to identify common mode inductor and differential mode inductor

How to identify common mode inductor and differential mode inductor

Common mode inductors and differential mode inductors are one of the effective anti-electromagnetic interference components, which are widely used in various filters, switching power supplies and other products, but common mode inductors are used to suppress common mode interference, while differential mode inductors are used to suppress differential mode interference, both are more important filter inductors.

Although the two types of inductors are filter inductors, the different functions determine the appearance and winding methods. For common mode inductors, it is wound on the same core, and the coil diameters and turns of the two windings are the same, but the winding direction is opposite. A set of coils has two pins, so the common mode inductor has 4 pins; while the differential mode inductor is wound on a core and only one coil, so it has only 2. Therefore, the common mode inductance and the differential mode inductance can be distinguished from the number of pins. As shown below.

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