This article provides a technical deep-dive into the (Diode for Alternating Current), a critical bidirectional trigger device widely used in power control electronics. What is a Diac DB2?
The DB2 works from junction temperature. Storage is wider (-55°C to +150°C). If your design runs hotter than 125°C, the breakover voltage will drift downward (negative temperature coefficient typical for DIACs). diac db2 datasheet pdf 14 top
This is the "ghost story" of the component. Once the DIAC breaks over at 32 volts, its internal resistance collapses. It actually lowers its voltage requirement to stay on. It enters a valley where it conducts easier than before. It is a one-way door; once you push the DIAC through that 32-volt wall, it tumbles down the other side, conducting freely until the current drops to almost nothing. Diac DB2 This article provides a technical deep-dive
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