With the power levels increasing in a number of different applications within the car, the paralleling of MOSFETs is becoming more common. When paralleling the MOSFETs the designer wants them to turn on at the same time; otherwise it could lead to current imbalance in the circuit which will lead to problems. One way to ensure this is to have a tight threshold voltage spread. The 40V superjunction products have a threshold voltage spread of 1.2V.