i have a doubt thyristor is also made of semiconductor material similar to transistor.

Replies

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  Jeffrey Arulraj

  There are transistors capable of operating even in 1 kV range and So I am not sure about what you mean by high power rating.
  
  DO check this link here buddy of a power transistor
  #-Link-Snipped-#
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  Jeffrey Arulraj

  If you go through the link very carefully the overall current through the circuit is very minimal resulting in lower power rating. I found this theory interesting but it has been proved "In a transistor Higher current will result in THERMAL RUNAWAY destroying the transistor at higher currents This is due to the reasons both the diodes tend to forward bias at higher voltages and undergo break down easily.
  
  In the case of thyristors very high currents can be supported by the device due to a reverse biased diode in the one of the junctions. This reverse bias cannot be break down very easily and it requires very high power dissipation to cross this break down barrier.
  
  This is why Thyristors support higher current ratings than Transistors
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  satty lavanya

  thyristor is nothing but.......scr. and i agree with above explanation