A certain power transistor is packaged in a TO-220 case having a thermal resistance, RJC = 3°C/W. The device will be mounted using a mica insulator and silicone grease (RCS = 1°C/W) onto a heat sink having RSA = 6°C/W.
The maximum junction temperature of the transistor is TJ = 150°C and the device must operate in an environment whose ambient temperature could reach 75°C.
Determine the maximum power that the transistor can dissipate without exceeding the maximum junction temperature.