Which of the following statements is INCORRECT for SCR? 

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MPPGCL JE Electrical 28 April 2023 Shift 2 Official Paper
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  1. It is a unidirectional device.
  2. It is made up of germanium of silicon.
  3. It is a three-terminal PNPN device.
  4. After triggering, gate signal can be removed.

Answer (Detailed Solution Below)

Option 2 : It is made up of germanium of silicon.
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Silicon-controlled rectifier (SCR)

F6 Madhuri Engineering 02.02.2023 D21

  • It is a 4-layer, 3-junction semiconductor device. Additionally, it has three terminals: anode, cathode, and gate.
  • An SCR is considered to be a semi-controlled device because it can be turned on but not off with a gate pulse. During the positive half cycle, SCR is in forwarding blocking mode.
  • By applying a gate pulse, the SCR can be turned ON. Once turned ON, gate signal can be removed.
  • SCR (Silicon-Controlled Rectifier) is a unidirectional device because it allows current to flow only in one direction from anode to cathode when it is in conduction mode.
  • SCRs (Silicon-Controlled Rectifiers) are made of silicon, not germanium. Silicon is preferred due to its higher temperature stability, better power handling capacity, and lower leakage current compared to germanium.
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