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Triac and SCR Output Photocouplers

TRIAC, from triode for alternating current, is a genericized tradename for an electronic component that can conduct current in either direction when it is triggered (turned on), and is formally called a bidirectional triode thyristor or bilateral triode thyristor. TRIACs are a subset of thyristors and are closely related to silicon-controlled rectifiers (SCR). However, unlike SCRs, which are unidirectional devices (that is, they can conduct current only in one direction), TRIACs are bidirectional and so allow current in either direction. Another difference from SCRs is that TRIAC current can be enabled by either a positive or negative current applied to its gate electrode, whereas SCRs can be triggered only by positive current into the gate. To create a triggering current, a positive or negative voltage has to be applied to the gate with respect to the MT1 terminal. A silicon-controlled rectifier (or semiconductor-controlled rectifier) is a four-layer solid state current controlling device. The name "silicon controlled rectifier" is General Electric's trade name for a type of thyristor. The SCR was developed by a team of power engineers led by Gordon Hall and commercialized by Frank W. "Bill" Gutzwiller in 1957. Some sources define silicon controlled rectifiers and thyristors as synonymous, other sources define silicon controlled rectifiers as a proper subset of the set of thyristors, those being devices with at least four layers of alternating N and P-type material.[3][4] According to Bill Gutzwiller, the terms "SCR" and "Controlled Rectifier" were earlier, and "Thyristor" was applied later as usage of the device spread internationally. SCRs are unidirectional devices as opposed to TRIACs which are bidirectional (i.e. current can flow through them in either direction). SCRs can be triggered normally only by currents going into the gate as opposed to TRIACs which can be triggered normally by either a positive or a negative current applied to its gate electrode.

Optoelectronics > OptoCouplers > Triac and SCR Output Photocouplers

Part No.	DS	Manufacturer	D/C	Qty	Region	Action
EL3023		Everlight	2010+	330	China	Request A Quote
EL3023		Everlight	-	47294	China	Request A Quote
EL3023		Everlight	2023+	20000	China	Request A Quote
EL3023		Everlight	2023+	21000	China	Request A Quote
EL3023		Everlight	2024+	3000	China	Request A Quote
EL3023		Everlight	-	300000	Taiwan	Request A Quote
EL3023		Everlight	2023+	25000	China	Request A Quote
EL3023		Everlight	2021+	78000	China	Request A Quote

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