2 March 2018

Compare Transistor and SCR


  • It has three terminals : Emitter, base and collector
  • It is a three layer, two junction device
  • The transistor is switched on by continuous base current
  • On state voltage drop is in the order of 0.3 to 0.8 voltages
  • The transistors are available in comparatively low voltage and current ratings
  • Commutation circuit does not necessary.
  • Applicable for high frequency


  • It has three terminals : Anode, cathode and gate
  • It is a four layer, three junction device
  • The SCR is switched on by gate pulse
  • The SCR remains in on condition after removing gate pulse
  • On state voltage drop is in the range of 1.0 to 1.5 voltages
  • SCRs are available in high voltage and high current ratings
  • Commutation circuit requires for the DC applications
  • Applicable for low frequency
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