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DIAC

Thyristors · DB3 32 V

DB3 trigger diode · breaks over at about 32 V in either direction, then snaps back by about 10 V · fires TRIAC gates in dimmers

DIAC on the simulator's bench

Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.

Typical part: DB3 DIAC

Pins

Terminal 1
Terminal 2

Ratings and limits

Breakover	32 V ± 4 V
Snap-back	≈ 10 V
Pulse current	2 A

How to use it

Blocks until the timing capacitor reaches 32 V, then dumps it into the TRIAC gate as a sharp pulse.

Lessons and builds that use it

TRIAC light dimmer with DIAC

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