For the 2N5457 JFET of Fig. 6.20, what is the power rating at a typical operating temperat...

For the 2N5457 JFET of Fig. 6.20, what is the power rating at a typical operating temperature of 45°C using the 5.0 mW/°C derating factor.

FIG. 6.20 n-channel 2N5457 JFET Characteristic k.