MOS-controlled thyristor

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Equivalent circuit of an MCT

An MOS-controlled thyristor (MCT) is voltage-controlled fully controllable thyristor. It was invented by IEEE.[1] The MCT is similar in operation with GTO thyristor, but it has a voltage controlled insulated gate. It has two MOSFETs of opposite conductivity types in its equivalent circuit. One is responsible for turn-on and the another is responsible for turn-off. A thyristor with only one MOSFET in its equivalent circuit, which can only be turned on (like normal SCRs), is called an MOS-gated thyristor.

Schematic of a MOSFET-controlled thyristor

Positive voltage on the gate terminal with respect to the cathode turns the thyristor to the on state.

Negative voltage on the gate terminal with respect to the anode, which is close to cathode voltage during the on state, turns the thyristor to the off state.

External links[edit]


  • "MOS-Controlled Thyristors—A New Class of Power Devices", IEEE Transactions on Electron Devices, Vol. ED-33, No. 10, Oct. 1986, Victor A. K. Temple, pp. 1609 through 1618.
  • "MOS GTO—A Turn Off Thyristor with MOS-Controlled Emitter Shorts," IEDM 85, M. Stoisiek and H. Strack, Siemens AG, Munich FRG pp. 158–161.
  1. ^ Hingorani, Narain G; Laszlo Gyugi (2011). Understanding FACTS. India: IEEE Press. p. 42. ISBN 978-81-265-3040-3.