TRIAC WITH INT TRIGGER Triode For Alternating Current (TRIAC) 284

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Part	Manufacturer	Trigger Device Type	Package Style (Meter)	Surface Mount	Terminal Position	Configuration	Case Connection	Package Body Material	Terminal Form	Package Shape	No. of Elements	Maximum Leakage Current	No. of Terminals	Sub-Category	Maximum Operating Temperature	Minimum Operating Temperature	Terminal Finish	Maximum RMS On-state Current	JESD-30 Code	Moisture Sensitivity Level (MSL)	Qualification	Repetitive Peak Off-state Voltage	Minimum Critical Rate of Rise of Commutation Voltage	Minimum Critical Rate of Rise of Off-state Voltage	Maximum Holding Current	Additional Features	JEDEC-95 Code	JESD-609 Code	Maximum Time At Peak Reflow Temperature (s)	Peak Reflow Temperature (C)	Reference Standard
Q2015LT65	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	15 A	R-PSFM-T3	2	Not Qualified	200 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q2015LT	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	2 mA	3	TRIACs	110 Cel	-40 Cel	Matte Tin (Sn)	15 A	R-PSFM-T3	2	Not Qualified	200 V	3 V/us	50 V/us	70 mA	HIGH RELIABILITY	TO-220AB	e3	10	260
Q6006LTH	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	.05 mA	3	TRIACs	125 Cel	-40 Cel	Matte Tin (Sn)	6 A	R-PSFM-T3	2	Not Qualified	600 V			50 mA	HIGH RELIABILITY	TO-220AB	e3	40	260
Q2015LTV	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	2 mA	3	TRIACs	125 Cel	-40 Cel	Matte Tin (Sn)	15 A	R-PSFM-T3	2	Not Qualified	200 V	3 V/us	50 V/us	70 mA	HIGH RELIABILITY	TO-220AB	e3	10	260
Q2004LT56	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	4 A	R-PSFM-T3	2	Not Qualified	200 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q2008LT59	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	8 A	R-PSFM-T3	2	Not Qualified	200 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q2015LT52	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	15 A	R-PSFM-T3	2	Not Qualified	200 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q4006LT53	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	6 A	R-PSFM-T3	2	Not Qualified	400 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q4008LT59	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	8 A	R-PSFM-T3	2	Not Qualified	400 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q6015LT68	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	YES	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	GULL WING	RECTANGULAR	1		3				Matte Tin (Sn)	15 A	R-PSFM-G3	2	Not Qualified	600 V						e3	10	260	UL RECOGNIZED
Q6004LT	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	2 mA	3	TRIACs	125 Cel	-40 Cel	Matte Tin (Sn)	4 A	R-PSFM-T3	2	Not Qualified	600 V	2 V/us	20 V/us	30 mA	HIGH RELIABILITY	TO-220AB	e3	40	260
Q6010LT59	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	10 A	R-PSFM-T3	2	Not Qualified	600 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q2006LT68	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	YES	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	GULL WING	RECTANGULAR	1		3				Matte Tin (Sn)	6 A	R-PSFM-G3	2	Not Qualified	200 V						e3	10	260	UL RECOGNIZED
Q5008LTH	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	.05 mA	3	TRIACs	125 Cel	-40 Cel		8 A	R-PSFM-T3		Not Qualified	500 V			50 mA	HIGH RELIABILITY	TO-220AB
Q4010LTTP56	Littelfuse	TRIAC WITH INT TRIGGER															MATTE TIN											e3	40	260
Q4010LTH56	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE		ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR		2 mA	3	TRIACs	125 Cel	-40 Cel	Matte Tin (Sn)	10 A	R-PSFM-T3		Not Qualified	400 V	30 V/us	700 V/us	60 mA		TO-220AB	e3	40	260
Q2015LT58	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	15 A	R-PSFM-T3	2	Not Qualified	200 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q6010LT51	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	10 A	R-PSFM-T3	2	Not Qualified	600 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q4004LT65	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	4 A	R-PSFM-T3	2	Not Qualified	400 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q2004LTTPV	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3		125 Cel	-40 Cel	Matte Tin (Sn)	4 A	R-PSFM-T3	2	Not Qualified	200 V				HIGH RELIABILITY	TO-220AB	e3	10	260
Q4010LTH	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	.05 mA	3	TRIACs	125 Cel	-40 Cel	Matte Tin (Sn)	10 A	R-PSFM-T3	2	Not Qualified	400 V			60 mA	HIGH RELIABILITY	TO-220AB	e3	40	260
Q5015LT68	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	YES	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	GULL WING	RECTANGULAR	1		3					15 A	R-PSFM-G3		Not Qualified	500 V									UL RECOGNIZED
Q6008LT65	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	8 A	R-PSFM-T3	2	Not Qualified	600 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q6015LTHV	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3		125 Cel	-40 Cel	Matte Tin (Sn)	15 A	R-PSFM-T3	2	Not Qualified	600 V				HIGH RELIABILITY	TO-220AB	e3	10	260
Q6010LT56	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	2 mA	3	TRIACs	125 Cel	-40 Cel	Matte Tin (Sn)	10 A	R-PSFM-T3	2	Not Qualified	600 V	4 V/us	120 V/us	60 mA		TO-220AB	e3	10	260	UL RECOGNIZED
Q4008LTHTPV	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3		125 Cel	-40 Cel	Matte Tin (Sn)	8 A	R-PSFM-T3	2	Not Qualified	400 V				HIGH RELIABILITY	TO-220AB	e3	10	260
Q2010LTTPV	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3		125 Cel	-40 Cel	Matte Tin (Sn)	10 A	R-PSFM-T3	2	Not Qualified	200 V				HIGH RELIABILITY	TO-220AB	e3	10	260
Q6006LTTPV	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3		125 Cel	-40 Cel	Matte Tin (Sn)	6 A	R-PSFM-T3	2	Not Qualified	600 V				HIGH RELIABILITY	TO-220AB	e3	10	260
Q6015LTTP56	Littelfuse	TRIAC WITH INT TRIGGER															MATTE TIN											e3	40	260
Q5010LT68	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	YES	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	GULL WING	RECTANGULAR	1		3					10 A	R-PSFM-G3		Not Qualified	500 V									UL RECOGNIZED
Q4008LT65	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	8 A	R-PSFM-T3	2	Not Qualified	400 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q4006LT68	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	YES	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	GULL WING	RECTANGULAR	1		3				Matte Tin (Sn)	6 A	R-PSFM-G3	2	Not Qualified	400 V						e3	10	260	UL RECOGNIZED
Q6010LTHTPV	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3		125 Cel	-40 Cel	Matte Tin (Sn)	10 A	R-PSFM-T3	2	Not Qualified	600 V				HIGH RELIABILITY	TO-220AB	e3	10	260
Q5015LT	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	2 mA	3	TRIACs	125 Cel	-40 Cel		15 A	R-PSFM-T3		Not Qualified	500 V	3 V/us	40 V/us	70 mA	HIGH RELIABILITY	TO-220AB
Q6008LT53	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	8 A	R-PSFM-T3	2	Not Qualified	600 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q6010LT	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	2 mA	3	TRIACs	125 Cel	-40 Cel	Matte Tin (Sn)	10 A	R-PSFM-T3	2	Not Qualified	600 V	3 V/us	20 V/us	50 mA	HIGH RELIABILITY	TO-220AB	e3	40	260
Q2015LT68	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	YES	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	GULL WING	RECTANGULAR	1		3				Matte Tin (Sn)	15 A	R-PSFM-G3	2	Not Qualified	200 V						e3	10	260	UL RECOGNIZED
Q4004LTV	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	2 mA	3	TRIACs	125 Cel	-40 Cel	Matte Tin (Sn)	4 A	R-PSFM-T3	2	Not Qualified	400 V	2 V/us	25 V/us	30 mA	HIGH RELIABILITY	TO-220AB	e3	10	260
Q5010LT65	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3					10 A	R-PSFM-T3		Not Qualified	500 V					TO-220AB				UL RECOGNIZED
Q6006LT59	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	6 A	R-PSFM-T3	2	Not Qualified	600 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q6010LTHTP	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	2 mA	3	TRIACs	125 Cel	-40 Cel	Matte Tin (Sn)	10 A	R-PSFM-T3	2	Not Qualified	600 V	30 V/us	600 V/us	60 mA	HIGH RELIABILITY	TO-220AB	e3	40	260
Q6006LT56	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	2 mA	3	TRIACs	125 Cel	-40 Cel	Matte Tin (Sn)	6 A	R-PSFM-T3	2	Not Qualified	600 V	4 V/us	85 V/us	50 mA		TO-220AB	e3	10	260	UL RECOGNIZED
Q6015LTHTP	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	2 mA	3	TRIACs	125 Cel	-40 Cel	MATTE TIN	15 A	R-PSFM-T3	2	Not Qualified	600 V	30 V/us	600 V/us	70 mA	HIGH RELIABILITY	TO-220AB	e3	10	260
Q2010LT65	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	10 A	R-PSFM-T3	2	Not Qualified	200 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q4008LT	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	2 mA	3	TRIACs	125 Cel	-40 Cel	Matte Tin (Sn)	8 A	R-PSFM-T3	2	Not Qualified	400 V	3 V/us	25 V/us	50 mA	HIGH RELIABILITY	TO-220AB	e3	40	260
Q2010LT59	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1		3				Matte Tin (Sn)	10 A	R-PSFM-T3	2	Not Qualified	200 V					TO-220AB	e3	10	260	UL RECOGNIZED
Q6010LTTP56	Littelfuse	TRIAC WITH INT TRIGGER															MATTE TIN											e3	40	260
Q6008LT	Littelfuse	TRIAC WITH INT TRIGGER	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED	PLASTIC/EPOXY	THROUGH-HOLE	RECTANGULAR	1	2 mA	3	TRIACs	125 Cel	-40 Cel	Matte Tin (Sn)	8 A	R-PSFM-T3	2	Not Qualified	600 V	3 V/us	20 V/us	50 mA	HIGH RELIABILITY	TO-220AB	e3	40	260

Triode For Alternating Current (TRIAC)

A Triode for Alternating Current (TRIAC) is a semiconductor device that is used to control the flow of electrical current in AC circuits. It is a bidirectional device that can conduct current in both directions, making it useful for AC power control applications.

TRIACs consist of a bidirectional switching element that allows for the control of AC current in both directions. They are typically used in applications where AC voltage needs to be controlled, such as in lighting control, motor speed control, and power supplies.

TRIACs work by applying a small current or voltage to the gate terminal, which allows current to flow through the device. Once the current reaches a certain level, the TRIAC turns on and conducts current in both directions until the current drops below a certain threshold, at which point the TRIAC turns off.

TRIACs are commonly used in conjunction with other components such as capacitors, inductors, and diodes to form complete electronic circuits. They are often used in power control circuits that require precise control of AC voltage or current.