WHAC-4532A-900T0 RDC39Ω Isolation Resistance 10MΩ Rated Current3mA Common Mode Chokes
WHAC-4532A-900T0 RDC39Ω Isolation Resistance 10MΩ Rated Current3mA Common Mode Chokes
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They work on the same principle but have different design priorities. Signal line CMCs (such as the WHAC and WHLC series) are mostly small chip packages with low current ratings and strictly controlled parasitics; the focus is on suppressing common mode noise without degrading the integrity of high-speed differential signals. Power line CMCs, by contrast, emphasize high current-carrying capability and high common mode impedance in the low frequency band.
They are commonly used on various differential signal lines such as USB, HDMI, LVDS, CAN, RS485, and Ethernet. Connected in series with the differential pair, they filter out common mode noise picked up by or radiated from cables, improving EMI performance and immunity to interference.
For differential signals, the currents in the two windings flow in opposite directions, so the magnetic flux cancels and the impedance is low; common mode noise currents flow in the same direction, so the flux adds up and the impedance is high. However, if the two windings are asymmetric (deviations in turns or winding position), part of the differential signal is converted into a common mode component (i.e., mode conversion, specified by Scd21/Ssd21), which becomes a new radiation source. For high-speed interfaces, check the manufacturer's mode conversion specifications during selection.
It does have an impact - the key is keeping it under control. The CMC's differential mode insertion loss, parasitic capacitance, and impedance discontinuity can degrade the eye diagram, and the higher the data rate, the more sensitive the signal. When selecting, make sure the differential mode cutoff frequency is at least 3-5 times the signal's fundamental frequency, check the differential mode insertion loss curve (e.g., -3 dB bandwidth), and place the device as close to the connector as possible to avoid introducing discontinuities in the middle of impedance-controlled traces.
