The DIAC reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

DIAC

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 30V. They are typically used for triggering TRIACss.

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