DIAC is an electronic component that stands for "Diode for Alternating Current." It is a solid-state device used in electrical circuits to control the flow of electricity, primarily in AC circuits. The DIAC is essentially a bidirectional trigger diode that can conduct current in both directions when a particular voltage threshold is reached.
In operation, the DIAC remains non-conductive until the voltage across it reaches its breakover voltage. Once this threshold is reached, the DIAC turns on and allows current to flow in either direction through the device. The breakover voltage is typically a low voltage range, which makes the DIAC suitable for triggering larger components such as thyristors or triacs.
The DIAC is often used in applications that require triggering of components in response to specific voltage levels, such as in dimmer circuits, motor speed controls, and lamp-intensity controls. It is commonly employed as a triggering device because of its ability to automatically reset once the voltage across it drops below the breakover voltage.
Due to its symmetrical characteristics, the DIAC allows for triggering at both positive and negative voltage peaks, making it suitable for AC circuits. It offers a reliable and precise means of switching AC current, providing controlled triggering at specific voltage levels to facilitate desired circuit operation.
Overall, the DIAC is an essential component in many electronic circuits, enabling precise control and modulation of alternating current flow.
