Capacitance: Input, output, and reverse transfer capacitances (Ciss, Coss, Crss), which impact switching speed and drive requirements.
Before you solder, ask three questions answered only by the data sheet: data sheet of transistor
DC Current Gain (hFE): For Bipolar Junction Transistors (BJTs), this represents the ratio of collector current to base current. It is highly variable based on temperature and current levels. and reverse transfer capacitances (Ciss
Switching Times: Delay, rise, storage, and fall times, which determine how fast the transistor can move between states. Characteristic Curves and fall times