Power MOSFETs working in linear zone: The dangerous effect of the K gain factor on thermal instability

The gain factor K of the power MOSFET is an electrical parameter that mathematically speaking connects V_GS to I_D. Practically, higher is K higher will be I_D fixing V_GS, V_TH and all the others physical and electrical parameters. K is a very important electrical parameter regarding the power MOSFET working in linear operating zone. In fact, even if, typically, higher K factor needs in switching operation mode, in linear zone, instead, K must be low to avoid a possible premature failure of the device.