DIACs

DIACs

DIACs, or Diode Alternating Current Switches, are electronic devices that are used to control the flow of alternating current (AC) in a circuit. They are essentially two diodes connected in parallel and in opposite directions. DIACs are commonly used in electronic circuits that require precise control of AC voltage levels, such as in dimmer switches for lighting. When a DIAC is connected to an AC voltage source, it initially acts as an open circuit. However, when the voltage across the DIAC reaches a certain threshold, called the breakover voltage, the device switches on and allows current to flow. Once the DIAC is conducting, it remains on until the voltage across it drops below a certain level, called the holding voltage. This behavior makes DIACs useful for controlling the timing and amplitude of AC signals. DIACs are often used in conjunction with other electronic components, such as triacs and thyristors, to create more complex circuits. They are also commonly used in power supplies, motor control circuits, and electronic lighting systems.

electronic devices, alternating current, diodes, voltage control, breakover voltage

— Paul Davis

CITATION : "Paul Davis. 'DIACs.' Design+Encyclopedia. https://design-encyclopedia.com/define/diacs?E=315782 (Accessed on October 13, 2026)"