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The DIAC is a bidirectional trigger diode that conducts current only after its breakdown voltage has been exceeded momentarily. It stops conducting when the current through it drops below a value characteristic for the device. The behavior is typically the same for both directions of current flow. Most DIACs have a breakdown voltage around 30 V. In this way, their behavior is somewhat similar to (but much more precisely controlled and taking place at lower voltages than) a neon lamp.
DIACs are a form of thyristor. They are typically used for triggering TRIACs, another form of thyristor.
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