What is the diode’s I2t?

I2t is a Joule-integral for overcurrent allowed within the range that does not result in element destruction. Overcurrent is defined in one cycle at commercially restricted half-waves (50, 60 Hz).

What is the case temperature (Tc)?

Case temperature (Tc) is the temperature on the module copper base surface right under a semiconductor chip where the temperature is the highest.

What is the junction temperature (Tj)?

Junction temperature is the temperature at joints on a semiconductor chip.