Products in the DIAC and SIDAC family are two-terminal devices primarily used as triggering mechanisms in AC phase control applications. They resist current flow until the voltage across them reaches a critical threshold, after which current flow increases dramatically. The main difference between the two lies in their characteristic curves: DIACs (Diodes for Alternating Current) typically exhibit higher forward voltages in their conductive state, making them less ideal than SIDACs (Silicon Diode for Alternating Current) when significant current flow is needed in an application.

What is a DIAC?

A DIAC, which stands for "Diode for Alternating Current," is a two-terminal bidirectional switch that allows current to flow in both directions when the applied voltage exceeds its breakover voltage. It does not provide amplification or controlled switching.

Though it is part of the thyristor family, it functions as an uncontrolled switch since it lacks a gate or control terminal. Its name suggests its capability to conduct AC in both directions. DIACs are primarily utilized for triggering other devices, like TRIACs, because of their symmetrical switching properties.

What is a SIDAC?

A Sidac, often referred to as a DIAC (diode for alternating current), is a symmetrical two-terminal semiconductor device featuring a three-layer structure. It is primarily utilized to activate a bidirectional thyristor for overvoltage protection in electrical circuits, with a trigger voltage ranging from 70V to 310V.

•Embedded devices with reaction speeds ranging from picoseconds to nanoseconds
• IEC 61000-4-2 Contact or air mode ESD bombardment energy ranging from 6kV to 30kV
•The reverse cut-off voltage VRWM ranges from 2.8V to 70V, and different parameter specifications can also be customized according to customer needs