TDK has created a range of surface-mount high-current common-mode chokes. “Customers who prefer reflow soldering but need high-current common-mode chokes can now get an SMD solution,” according to the ...
Spoiler summary: It only takes -60 dB of mode conversion to fail an EMC compliance test if this common signal gets out on unshielded twisted pair cables. If a common mode choke is used, as much as -20 ...