Symbols of Thyristors, Triacs and Diacs

The Thyristors are semiconductors of four caps that are activated by application of an impulse and are deactivated on not having supplied the current of work. They handle big powers. They are recognized by the English initials SCR.
The triac and diac are bidirectional semiconductor devices.

Symbology of Thyristors, Triacs and Diacs

Symbol Description Symbol Description
SCR Thyristor symbol Thyristor SCR
Silicon Controlled Rectifier
  SCS thyristor symbol Thyristor SCS
Silicon Controlled Switch
Thyristor Schottky PNPN 4 layer symbol Thyristor Schottky PNPN 4 layer   Thyristor Schottky PNPN 4 layer symbol Thyristor Schottky PNPN 4 layer
Thyristor Schottky PNPN 4 layer symbol Thyristor Schottky PNPN 4 layer   Symbol of the reverse conducting thyristor gate P channel controlled by cathode Reverse conducting thyristor gate P channel controlled by cathode
Symbol of the reverse conducting thyristor gate N channel controlled by anode Reverse conducting thyristor gate N channel controlled by anode   Symbol of the turn-off thyristor gate P channel controlled by cathode Turn-off thyristor gate P channel controlled by cathode
Symbol of the turn-off thyristor gate N channel controlled by anode Turn-off thyristor gate N channel controlled by anode   Photo thyristor symbol Photo thyristor
Diac symbol Diac
Generic symbol
  Diac symbol Diac
Diac symbol Diac   Trigger diac symbol Trigger diac
Triac symbol Triac   Sidac symbol Sidac
SBS symbol SBS
Silicon bilateral switch
  SUS symbol SUS
Silicon unilateral switch
Ditriac / Quadrac symbol Ditriac / Quadrac   Darlistor symbol Darlistor
Picture gallery of thirystors, triacs and diacs
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