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The DB2 is a silicon bi-directional trigger diode (DIAC) commonly used in power control circuits, such as light dimmers and motor speed controllers, to trigger triacs.
Diac DB2 Document type: Datasheet (PDF) Version: 14
You can find detailed PDF versions from manufacturers like STMicroelectronics on The Datasheet Archive . Datasheet - DB3, DB4, SMDB3 - Diac - STMicroelectronics
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