ISOLATED Triode For Alternating Current (TRIAC) 135

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Part	Manufacturer	Trigger Device Type	Package Style (Meter)	Surface Mount	Terminal Position	Configuration	Case Connection	Maximum On-state Voltage	Package Body Material	Maximum DC Gate Trigger Current	Non Repetitive Peak On-state Current	Terminal Form	Package Shape	Maximum On-state Current	No. of Elements	Maximum Leakage Current	Repetitive Peak Reverse Voltage	Maximum Repetitive Peak Off-state 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)	Maximum DC Gate Trigger Voltage	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
TPDV640RG	STMicroelectronics	TRIAC		NO		SINGLE	ISOLATED			200 mA					1	5 mA				TRIACs	125 Cel	-40 Cel		40 A		1	2.5 V		600 V	.00001 V/us	.0002 V/us							UL RECOGNIZED
TPDV1025RG	STMicroelectronics	TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	150 mA		THROUGH-HOLE	RECTANGULAR		1	2 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	25 A	R-PSFM-T3		2.5 V		1000 V	10 V/us	200 V/us				e3			UL RECOGNIZED
Q6016LH2	Littelfuse	TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	10 mA		THROUGH-HOLE	RECTANGULAR		1				3	TRIACs	125 Cel	-40 Cel	MATTE TIN	16 A	R-PSFM-T3		1.3 V		600 V	2 V/us	150 V/us	15 mA		TO-220AB	e3	40	260	UL RECOGNIZED
TPDV825RG	STMicroelectronics	TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	150 mA		THROUGH-HOLE	RECTANGULAR		1	2 mA			3	TRIACs	125 Cel	-40 Cel		25 A	R-PSFM-T3		2.5 V		800 V	10 V/us	200 V/us					NOT SPECIFIED	NOT SPECIFIED	UL RECOGNIZED
T435-600-W	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	35 mA		THROUGH-HOLE	RECTANGULAR		1			10 uA	3	TRIACs	125 Cel	-40 Cel	TIN	4 A	R-PSFM-T3		1.5 V	Not Qualified	600 V	3.5 V/us	250 V/us	35 mA	SENSITIVE GATE	TO-220AB	e3
T435-800-W	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	35 mA		THROUGH-HOLE	RECTANGULAR		1			10 uA	3	TRIACs	125 Cel	-40 Cel	TIN	4 A	R-PSFM-T3		1.5 V	Not Qualified	800 V	3.5 V/us	250 V/us	35 mA	SENSITIVE GATE	TO-220AB	e3
T410-600-W	STMicroelectronics	4 QUADRANT LOGIC LEVEL TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	10 mA		THROUGH-HOLE	RECTANGULAR		1			10 uA	3	TRIACs	125 Cel	-40 Cel	TIN	4 A	R-PSFM-T3		1.5 V	Not Qualified	600 V	1.8 V/us	50 V/us	15 mA	SENSITIVE GATE	TO-220AB	e3
T1030-600W	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	30 mA		THROUGH-HOLE	RECTANGULAR		1	.01 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	10 A	R-PSFM-T3		1.5 V	Not Qualified	600 V	20 V/us	300 V/us			TO-220AB	e3			UL RECOGNIZED
T1620-600W	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	20 mA		THROUGH-HOLE	RECTANGULAR		1	.01 mA			3	TRIACs	125 Cel	-40 Cel	TIN	16 A	R-PSFM-T3		1.5 V	Not Qualified	600 V	10 V/us	200 V/us			TO-220AB	e3			UL RECOGNIZED
T1620-700W	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	20 mA		THROUGH-HOLE	RECTANGULAR		1	.01 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	16 A	R-PSFM-T3		1.5 V	Not Qualified	700 V	10 V/us	200 V/us			TO-220AB	e3			UL RECOGNIZED
T1630-600W	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	30 mA		THROUGH-HOLE	RECTANGULAR		1	.01 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	16 A	R-PSFM-T3		1.5 V	Not Qualified	600 V	20 V/us	300 V/us			TO-220AB	e3			UL RECOGNIZED
T620-600W	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	20 mA		THROUGH-HOLE	RECTANGULAR		1	.01 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	6 A	R-PSFM-T3		1.5 V	Not Qualified	600 V	10 V/us	200 V/us	35 mA		TO-220AB	e3			UL RECOGNIZED
T630-600W	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	30 mA		THROUGH-HOLE	RECTANGULAR		1	.01 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	6 A	R-PSFM-T3		1.5 V	Not Qualified	600 V	20 V/us	300 V/us	50 mA		TO-220AB	e3			UL RECOGNIZED
AVS08CBI	STMicroelectronics	TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY			THROUGH-HOLE	RECTANGULAR		1	.01 mA		10 uA	3	TRIACs	125 Cel	-10 Cel	MATTE TIN	5 A	R-PSFM-T3			Not Qualified	500 V				KIT COMPOSED OF TRIAC AND CONTROLLER	TO-220AB	e3
BTA25-400B	STMicroelectronics	TRIAC	FLANGE MOUNT	NO	UPPER	SINGLE	ISOLATED		PLASTIC/EPOXY	50 mA	260 A	SOLDER LUG	ROUND		1			10 uA	3	TRIACs	125 Cel	-40 Cel		30 A	O-PUFM-D3		1.5 V	Not Qualified	400 V	10 V/us	250 V/us	80 mA
BTA25-700B	STMicroelectronics	TRIAC	FLANGE MOUNT	NO	UPPER	SINGLE	ISOLATED		PLASTIC/EPOXY	50 mA	260 A	SOLDER LUG	ROUND		1			10 uA	3	TRIACs	125 Cel	-40 Cel		30 A	O-PUFM-D3		1.5 V	Not Qualified	700 V	10 V/us	250 V/us	80 mA				NOT SPECIFIED	NOT SPECIFIED
BTA40-700B	STMicroelectronics	4 QUADRANT LOGIC LEVEL TRIAC	FLANGE MOUNT	NO	UPPER	SINGLE	ISOLATED		PLASTIC/EPOXY	100 mA	315 A	SOLDER LUG	ROUND		1				3	TRIACs	125 Cel	-40 Cel		40 A	O-PUFM-D3		1.5 V	Not Qualified	700 V			80 mA				NOT SPECIFIED	NOT SPECIFIED
BTA26-600BW	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	50 mA		THROUGH-HOLE	RECTANGULAR		1	3 mA		10 uA	3	TRIACs	125 Cel	-40 Cel	MATTE TIN	25 A	R-PSFM-T3		1.5 V	Not Qualified	600 V		500 V/us	75 mA			e3
Q8004L3TP	Littelfuse	TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED	1.6 V	PLASTIC/EPOXY	10 mA		THROUGH-HOLE	RECTANGULAR		1	2 mA	800 V	2000 uA	3		125 Cel	-40 Cel	MATTE TIN	4 A	R-PSFM-T3		1.3 V	Not Qualified	800 V	40 V/us		20 mA		TO-220AB	e3	40	265	UL RECOGNIZED
T1635H-600IRG	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	35 mA		THROUGH-HOLE	RECTANGULAR		1	4.2 mA			3	TRIACs	150 Cel	-40 Cel	MATTE TIN	16 A	R-PSFM-T3	1	1.3 V	Not Qualified	600 V		300 V/us	35 mA		TO-220AB	e3
T2035H-600IRG	STMicroelectronics	SNUBBERLESS TRIAC	SMALL OUTLINE	YES	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	35 mA		GULL WING	RECTANGULAR		1	7.4 mA			2	TRIACs	150 Cel	-30 Cel		20 A	R-PSSO-G2		1.3 V	Not Qualified	600 V		300 V/us	35 mA		TO-220AB		NOT SPECIFIED	NOT SPECIFIED
ACST2-8SFP	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	10 mA		THROUGH-HOLE	RECTANGULAR		1	.5 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	2 A	R-PSFM-T3		1.1 V	Not Qualified	800 V		500 V/us	10 mA		TO-220AB	e3
T1035H-6I	STMicroelectronics	TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	35 mA		THROUGH-HOLE	RECTANGULAR		1				3	TRIACs	150 Cel	-40 Cel	MATTE TIN	10 A	R-PSFM-T3		1 V	Not Qualified	600 V		1000 V/us	35 mA		TO-220AB	e3
T1050H-6I	STMicroelectronics	TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	50 mA		THROUGH-HOLE	RECTANGULAR		1				3	TRIACs	150 Cel	-40 Cel	MATTE TIN	10 A	R-PSFM-T3		1 V	Not Qualified	600 V		1500 V/us	75 mA		TO-220AB	e3
T1250H-6I	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	50 mA		THROUGH-HOLE	RECTANGULAR		1				3	TRIACs	150 Cel	-40 Cel	MATTE TIN	12 A	R-PSFM-T3		1 V	Not Qualified	600 V		1500 V/us	75 mA		TO-220AB	e3
T1635H-6I	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	35 mA		THROUGH-HOLE	RECTANGULAR		1				3	TRIACs	150 Cel	-40 Cel	MATTE TIN	16 A	R-PSFM-T3		1 V	Not Qualified	600 V	21 V/us	1000 V/us	35 mA		TO-220AB	e3
T850H-6I	STMicroelectronics	TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	50 mA		THROUGH-HOLE	RECTANGULAR		1				3	TRIACs	150 Cel	-40 Cel	MATTE TIN	8 A	R-PSFM-T3		1 V	Not Qualified	600 V	14 V/us	1500 V/us	75 mA		TO-220AB	e3
Q4040K5TP	Littelfuse	ALTERNISTOR TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	50 mA		THROUGH-HOLE	RECTANGULAR		1	5 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	40 A	R-PSFM-T3		1.3 V	Not Qualified	400 V	20 V/us	500 V/us	75 mA		TO-218AC	e3	40	260	UL RECOGNIZED
Q6040K5TP	Littelfuse	ALTERNISTOR TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	50 mA		THROUGH-HOLE	RECTANGULAR		1	5 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	40 A	R-PSFM-T3		1.3 V	Not Qualified	600 V	20 V/us	475 V/us	75 mA		TO-218AC	e3	40	260	UL RECOGNIZED
Q8040K5TP	Littelfuse	ALTERNISTOR TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	50 mA		THROUGH-HOLE	RECTANGULAR		1	5 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	40 A	R-PSFM-T3		1.3 V	Not Qualified	800 V	20 V/us	400 V/us	75 mA		TO-218AC	e3	40	260	UL RECOGNIZED
BTA/12-700CRG	STMicroelectronics	TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	25 mA		THROUGH-HOLE	RECTANGULAR		1	.5 mA			3	TRIACs	125 Cel	-40 Cel		12 A	R-PSFM-T3			Not Qualified	700 V	5 V/us	50 V/us	50 mA		TO-220AB
BTA06T-600CWRG	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	35 mA		THROUGH-HOLE	RECTANGULAR		1	1 mA			3	TRIACs	125 Cel	-40 Cel		6 A	R-PSFM-T3		1.3 V	Not Qualified	600 V		750 V/us	35 mA		TO-220AB		NOT SPECIFIED	NOT SPECIFIED
ACST6-7SFP	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	10 mA		THROUGH-HOLE	RECTANGULAR		1	.5 mA			3	TRIACs	125 Cel	-30 Cel	MATTE TIN	1.5 A	R-PSFM-T3		1.5 V	Not Qualified	700 V		200 V/us	25 mA		TO-220AB	e3
ACST8-8CFP	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	30 mA		THROUGH-HOLE	RECTANGULAR		1	1 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	8 A	R-PSFM-T3		1.5 V	Not Qualified	800 V		500 V/us	40 mA		TO-220AB	e3
T820-800W	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	20 mA		THROUGH-HOLE	RECTANGULAR		1	2 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	8 A	R-PSFM-T3		1.5 V	Not Qualified	800 V	10 V/us	200 V/us	35 mA		TO-220AB	e3			UL RECOGNIZED
T830-800W	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	30 mA		THROUGH-HOLE	RECTANGULAR		1	2 mA			3	TRIACs	125 Cel	-40 Cel	TIN	8 A	R-PSFM-T3		1.5 V	Not Qualified	800 V	20 V/us	300 V/us	50 mA		TO-220AB	e3			UL RECOGNIZED
BTA06-800CRG	STMicroelectronics	4 QUADRANT LOGIC LEVEL TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	25 mA		THROUGH-HOLE	RECTANGULAR		1	1 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	6 A	R-PSFM-T3		1.3 V	Not Qualified	800 V	5 V/us	200 V/us	25 mA		TO-220AB	e3			UL RECOGNIZED
BTA06-800CWRG	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	35 mA		THROUGH-HOLE	RECTANGULAR		1	1 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	6 A	R-PSFM-T3		1.3 V	Not Qualified	800 V		400 V/us	35 mA		TO-220AB	e3			UL RECOGNIZED
BTA16-600BRG	STMicroelectronics	4 QUADRANT LOGIC LEVEL TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	50 mA		THROUGH-HOLE	RECTANGULAR		1	2 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	16 A	R-PSFM-T3		1.3 V	Not Qualified	600 V	10 V/us	400 V/us	50 mA		TO-220AB	e3			UL RECOGNIZED
ACST4-7CFP	STMicroelectronics	4 QUADRANT LOGIC LEVEL TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	25 mA		THROUGH-HOLE	RECTANGULAR		1	.5 mA			3	TRIACs	125 Cel	-30 Cel	MATTE TIN	4 A	R-PSFM-T3		1.1 V	Not Qualified	700 V		500 V/us	35 mA		TO-220AB	e3
ACST4-7SFP	STMicroelectronics	4 QUADRANT LOGIC LEVEL TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	10 mA		THROUGH-HOLE	RECTANGULAR		1	.5 mA			3	TRIACs	125 Cel	-30 Cel	MATTE TIN	4 A	R-PSFM-T3		1 V	Not Qualified	700 V		200 V/us	20 mA		TO-220AB	e3
BTA16-700BWRG	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	50 mA		THROUGH-HOLE	RECTANGULAR		1	2 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	16 A	R-PSFM-T3		1.3 V	Not Qualified	700 V		1000 V/us	50 mA		TO-220AB	e3			UL RECOGNIZED
BTA16-700CWRG	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	35 mA		THROUGH-HOLE	RECTANGULAR		1	2 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	16 A	R-PSFM-T3		1.3 V	Not Qualified	700 V		500 V/us	35 mA		TO-220AB	e3			UL RECOGNIZED
ACS120-7SFP	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE WITH BUILT-IN TRIGGER ELEMENT IN SERIES WITH GATE	ISOLATED		PLASTIC/EPOXY	10 mA	20 A	THROUGH-HOLE	RECTANGULAR	2 A	1	.2 mA			3	TRIACs	125 Cel	-30 Cel	MATTE TIN	2 A	R-PSFM-T3		1 V	Not Qualified	700 V					TO-220AB	e3
T630-800W	STMicroelectronics	SNUBBERLESS TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY	30 mA		THROUGH-HOLE	RECTANGULAR		1	.005 mA			3	TRIACs	125 Cel	-40 Cel	MATTE TIN	6 A	R-PSFM-T3		1.3 V	Not Qualified	800 V		500 V/us	50 mA		TO-220AB	e3
L2004L3TP	Littelfuse	4 QUADRANT LOGIC LEVEL TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED		PLASTIC/EPOXY			THROUGH-HOLE	RECTANGULAR		1				3		110 Cel	-40 Cel	Matte Tin (Sn)	4 A	R-PSFM-T3	2		Not Qualified	200 V				HIGH RELIABILITY	TO-220AB	e3	10	260
L4004L6TP	Littelfuse	4 QUADRANT LOGIC LEVEL TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED	1.6 V	PLASTIC/EPOXY	10 mA		THROUGH-HOLE	RECTANGULAR		1	.2 mA	400 V	200 uA	3		110 Cel	-40 Cel	MATTE TIN	4 A	R-PSFM-T3	2	1.3 V	Not Qualified	400 V			10 mA		TO-220AB	e3	10	260	UL RECOGNIZED
L4004L8TP	Littelfuse	4 QUADRANT LOGIC LEVEL TRIAC	FLANGE MOUNT	NO	SINGLE	SINGLE	ISOLATED	1.6 V	PLASTIC/EPOXY	20 mA		THROUGH-HOLE	RECTANGULAR		1	.2 mA	400 V	200 uA	3		110 Cel	-40 Cel	MATTE TIN	4 A	R-PSFM-T3	2	1.3 V	Not Qualified	400 V			15 mA		TO-220AB	e3	10	260	UL RECOGNIZED

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.