It consists of an ON-FET, an OFF-FET and two transistors.
The MOS structure of the MCT is represented in the equivalent circuit.
It consists of one ON-FET, a p-channel MOSFET, and an OFF-FET.
Both n-p-n and p-n-p transistors are joined together to represent the n-p-n-p structure of MCT.
An n-channel MOSFET is represented by drawing the arrow towards the gate terminal.
A p-channel MOSFET is indicated by drawing the arrow away from the gate terminal.
The two transistors in the equivalent circuit indicate that there is regenerative
feedback in the MCT just as it is an ordinary thyristor.
The circuit symbol of MCT is shown below.