What are the specification of diode?

Answer 1

The most important specifications of a diode are:

• maximum forward current
• peak inverse voltage (aka maximum reverse voltage)
• reverse leakage current
• reverse turnoff time (very important in high speed switching diodes)
• maximum power dissipation (only given for power rectifier diodes)
• forward bias knee voltage
• parasitic capacitance (only important in high frequency applications)

All of this and more can be found in the datasheet for the diode.