Diodes can be subdivided into two main classes:

1. Rectifier diodes (standard recovery) can be split into two sub-classes:
   1. Normal recovery Diodes
   • for conversion of AC (alternating current) to DC (direct current),
   • optimized for low conduction losses,
   • able to handle very large currents , and
   • able to withstand only moderate dynamic stress in transition from conducting to the blocking state.
   2. Avalanche Diodes
   • self protected against transient over-voltages.
2. Fast recovery diodes are typically used in drives, neutral point clamp diodes, metal melting/electrolysis , snubber diodes and input rectifiers for AC drives. These devices feature:
• 32 up to 96 mm wafer,
• 175 A up to 13500 A,
• 200 V up to 6000 V, and
• free floating, LTB and alloyed technology.