What is the transistor called that consists of two complementary SCRs in parallel with a common gate terminal?

The correct answer is the TRIAC, which is a type of transistor that consists of two complementary silicon controlled rectifiers (SCRs) connected in parallel with a common gate terminal. This configuration allows the TRIAC to control current in both directions, making it particularly useful in alternating current (AC) applications.

The unique structure of the TRIAC enables it to switch on and off in response to gate signals, allowing for effective control of power. It is widely used in light dimmers, motor speed controls, and other applications where variable power output is required.

The other options refer to different types of transistors that do not share the same functionality or structure as the TRIAC. For instance, the Junction Field Effect Transistor (JFET) is a type of FET designed for voltage-controlled operation, while the Insulated Gate Bipolar Transistor (IGBT) combines features of both MOSFETs and bipolar transistors for high-efficiency switching. A Darlington Transistor, on the other hand, consists of two bipolar transistors connected to provide high current gain but does not function like a TRIAC in AC applications.

Understanding the characteristics and applications of the TRIAC can enhance your knowledge of power electronic devices and their integration in AC power