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The diac a bidirectional trigger diode that is designed specifically to trigger a triac or SCR. Basically the diac does not conduct (except for a small leakage current) until the breakover voltage is reached. At that point the diac goes into avalanche conduction, also at that point the device exhibits a negative resistance characteristic, and the voltage drop across the diac snaps back,typically about 5 volts, creating a breakover current sufficient to trigger a triac or SCR.

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Specifications of a Diac:

• Performance specifications of a diac include:
• Diac breakover voltage
• Voltage symmetry of a diac
• Diac breakover current
• Power dissipation of a diac
• Diac breakback Voltage

Here are the few DIAC's American Microsemiconductor supplies:

1N5758A, 1N5760, 1N5761, 1N5762, D3202Y, ST2, HT32, DB3.

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