WHACM15A60R152 Dimensions15.0±0.5*13.0±0.5*6.6 DC Resistance 23mΩ Rated DC Current 5A Common Mode Chokes
WHACM15A60R152 Dimensions15.0±0.5*13.0±0.5*6.6 DC Resistance 23mΩ Rated DC Current 5A Common Mode Chokes
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A power line common mode choke (CMC) consists of a pair (or multiple pairs) of coils wound on the same magnetic core, connected in series with the power input/output lines. It presents high impedance to common mode noise while remaining nearly "transparent" to the differential mode operating current. It is mainly used to suppress common mode EMI on power lines, helping equipment pass conducted emission (CE) and other EMC certifications.
Core parameters include common mode inductance, rated current, DC resistance (DCR), rated voltage and withstand voltage. As a general rule, the rated current should exceed the maximum operating current of the line with some margin, while the inductance is determined by the noise frequency band to be suppressed - choose high inductance for low-frequency noise, or lower inductance combined with filter capacitors for high-frequency noise.
Not necessarily. Higher inductance means more turns, which increases the parasitic capacitance between windings and lowers the self-resonant frequency (SRF). Above the SRF, the impedance becomes capacitive and high-frequency suppression actually deteriorates, while DCR and temperature rise increase. The correct approach is to first identify the dominant noise frequency, then select the part with the highest impedance in that band; if necessary, cascade two stages with high and low inductance to cover a wide frequency range.
In theory, the differential mode magnetic flux in a common mode choke cancels out, so the core does not saturate easily. In practice, however, leakage inductance corresponds to a differential mode component, and high current can still cause local core saturation, leading to inductance drop and loss of noise suppression. When evaluating, pay attention to the manufacturer's inductance derating curve at rated current and the temperature rise data (usually limited to a 40 K rise); in high-temperature environments, also consider derating with respect to the core's Curie temperature.
