DC Line Filter Modules OmniOn Power DC Line Filter Modules are designed to reduce the conducted common-mode and differential-mode noise on input or output lines of high-frequency switching power supplies. They are available in current ratings of 5A, 7A, 10A, 12A, and 20A in both surface mount and through-hole versions. OmniOn Power DC Line Filter Modules enable engineers to meet the requirements of EMI standards CISPR 22 (EN55022) and FCC Class B.