Electrical & Electronic Symbols

Thyristor, Triac and Diac Symbols

Thyristors - SCR, are semiconductors that are activated when an impulse is applied and deactivated when they do not receive the switching current. They handle high power. Triac and diac are bidirectional semiconductor devices.

Symbols of Thyristors, Triacs and Diacs
Symbol Description Symbol Description
SCR Thyristor symbol Thyristor SCR
Silicon Controlled Rectifier
+ Info		   SCS thyristor symbol Thyristor SCS / Thyristor Tetrode
Silicon Controlled Switch
Fourth layer PNPN Schottky thyristor symbol Fourth layer PNPN Schottky thyristor   Fourth layer PNPN Schottky thyristor symbol Fourth layer PNPN Schottky thyristor
Fourth layer PNPN Schottky thyristor symbol Fourth layer PNPN Schottky thyristor   Symbol of Reverse conducting thyristor, P channel gate controlled by cathode Reverse conducting thyristor, P channel gate controlled by cathode
Symbol of Reverse conducting thyristor, N channel gate controlled by anode Reverse conducting thyristor, N channel gate controlled by anode   Symbol of Turn-off conducting thyristor, P channel gate controlled by cathode Turn-off conducting thyristor, P channel gate controlled by cathode
Symbol of Turn-off conducting thyristor, N channel gate controlled by anode Turn-off conducting thyristor, N channel gate controlled by anode   Photo thyristor symbol Photo-Thyristor
Diac symbol Diac
Generic symbol
+ Info		   Diac symbol Diac
Diac symbol Diac   Trigger diac symbol Trigger Diac
Tree layer Diac
Triac symbol Triac
Triode for Alternating Current
+ Info		   SIDAC symbol SIDAC
Silicon Diode for Alternating Current
+ Info
SBS symbol SBS
Silicon bilateral switch		   SUS symbol SUS
Silicon unilateral switch
Ditriac / Quadrac symbol Ditriac / Quadrac
+ Info		   Darlistor symbol Darlistor
Picture gallery of thirystors, triacs and diacs
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