OptiMOS™7 40V sTOLL 7x8 New benchmark for best Ron, high power density & efficiency OptiMOS™ 7 40 V in sTOLL 7x8 offers highest power density and energy efficiency at the industry’s lowest on-state resistance on a 7x8mm2 footprint. At the same time, it offers reduced switching losses, improved SOA ruggedness and high avalanche current capability to facilitate high efficient system design for tomorrows automotive applications.