A common mode choke in the EMI filtering circuit, helps to achieve electromagnetic compatibility (EMC), suppressing the conducted noise in all types of power transmission and power lines.

The mounting direction does not impact the operating characteristics of common mode chokes.

Yes, they are emitting heat under operation. The generated power is calculated by the standard power equation: I² x R. R is the DC resistance and I the applied DC current, respectively the translated RMS value for an AC current. CM chokes are designed to suppress high-frequency noise, therefore, no significant HF losses are introduced into the core or winding, which contributes to the heat generation.

Common-mode chokes suppress noise flowing in the same direction in all lines, differential-mode chokes work with signals or noise flowing in opposite directions in a pair of lines.

The main difference is that D-core chokes use a bobbin with separated winding chambers (2-sections per winding), allowing higher resonance frequencies to be reached. Typically, these chokes achieve higher pulse durability in addition.

Even though it depends on the magnitude and time period in which the current is applied, the warranty of our products doesn´t cover the usage with a higher rated current at the specific ambient temperature.

The rated temperature (T_R) is defined by industrial standards as the maximum ambient temperature at which an inductor can carry its rated current (I_R). If the ambient temperature in the application is higher than the rated temperature, derating should be considered to ensure safe operation.