I have been safely switching 30A at 12V, and that is also outside the dotted line for DC. The thing is the mosfet does not even get warm (maybe because I have a heat sink on it). This leads me to believe that the graph is not very accurate (or is accurate without the heat sink). Increasing the number of mosfets is certainly an improvement but I am still not sure if that is really needed. This mosfet has impressive characteristics and putting 2 in parallel might be overkill for this application.
My question is about the driver. What value of gate resistor do I need for a period of 300ms (again I am NOT PWMing the Mosfet). Essentially the mosfet is acting as a switch that is only on for a period of 300ms
Oops, I misread you last time, and looked it up for 300-usec. Duh, 300-msec is much different.
However, you were saying 60A, now you're saying 30A. That's a difference of 4X in dissipation, and
that's also much different. For Rds = 2-milliohms, Pd = 30A*30A*0.002ohms = 1.8W, which is not
much when using a heatsink. OTOH, with 60A*60A*0.002 = 7.2W, you'd probably see some heat-up.