Symbols of Thyristors, Triacs and Diacs
The Thyristors are semiconductors of four caps that are activated by the application of an impulse and are deactivated by not being supplied with the current for them to work. They handle big powers. They are recognized by the English initials SCR. The triac and diac are bidirectional semiconductor devices.
| Symbol | Description | Symbol | Description | |
|---|---|---|---|---|
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Thyristor SCR Silicon Controlled Rectifier + Info |
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Thyristor SCS / Thyristor Tetrode Silicon Controlled Switch |
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Fourth layer PNPN Schottky thyristor |  |
Fourth layer PNPN Schottky thyristor | |
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Fourth layer PNPN Schottky thyristor |  |
Reverse conducting thyristor, P channel gate controlled by cathode | |
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Reverse conducting thyristor, N channel gate controlled by anode |  |
Turn-off conducting thyristor, P channel gate controlled by cathode | |
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Turn-off conducting thyristor, N channel gate controlled by anode |  |
Photo-Thyristor | |
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Diac Generic symbol + Info |
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Diac | |
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Diac |  |
Trigger Diac Tree layer Diac |
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Triac Triode for Alternating Current + Info |
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SIDAC Silicon Diode for Alternating Current + Info |
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SBS Silicon bilateral switch |
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SUS Silicon unilateral switch |
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Ditriac / Quadrac + Info |
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Darlistor | |
Picture gallery of thirystors, triacs and diacsSymbol download |
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