OptiMOS™ 5 low-voltage MOSFETs 40V normal level offered in SuperSO8 package With the OptiMOS™5 40V normal level product family Infineon offers a benchmark solution for applications requiring normal level (higher threshold voltage) drive capability. The high Vth in the normal level portfolio offers immunity to false turn-on due to noisy environments. In addition, lower QGD/QGS ratios (CGD/CGS divider ratio) reduce the peak of the gate voltage spikes, further contributing to the robustness against unwanted turn-on.