4 QUADRANT LOGIC LEVEL TRIAC Triode For Alternating Current (TRIAC) 2,400+

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Part RoHS 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

T2513DH

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

50 mA

THROUGH-HOLE

RECTANGULAR

1

3 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

25 A

R-PSFM-T3

2.5 V

Not Qualified

400 V

500 V/us

150 mA

TO-220AB

e3

BTB08-400SW

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

10 uA

3

TRIACs

110 Cel

-40 Cel

MATTE TIN

8 A

R-PSFM-T3

1.5 V

Not Qualified

400 V

3.5 V/us

50 V/us

25 mA

TO-220AB

e3

BTB06-600TWRG

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

5 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

600 V

20 V/us

10 mA

TO-220AB

e3

BTB04-700T

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

5 mA

THROUGH-HOLE

RECTANGULAR

1

.75 mA

3

TRIACs

110 Cel

-40 Cel

MATTE TIN

4 A

R-PSFM-T3

2.5 V

Not Qualified

700 V

1 V/us

10 V/us

15 mA

SENSITIVE GATE

TO-220AB

e3

Z0110DN

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

SMALL OUTLINE

YES

DUAL

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

25 mA

GULL WING

RECTANGULAR

1

.01 mA

4

TRIACs

125 Cel

-40 Cel

MATTE TIN

1 A

R-PDSO-G4

1.5 V

Not Qualified

400 V

5 V/us

25 mA

SENSITIVE GATE

e3

BTB06-600SW/F2

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

YES

SINGLE

SINGLE

PLASTIC/EPOXY

10 mA

GULL WING

RECTANGULAR

1

10 uA

3

110 Cel

-40 Cel

Matte Tin (Sn)

6 A

R-PSFM-G3

1.5 V

Not Qualified

600 V

50 V/us

25 mA

e3

BTB06-600TW/F5

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

5 mA

THROUGH-HOLE

RECTANGULAR

1

10 uA

3

110 Cel

-40 Cel

Matte Tin (Sn)

6 A

R-PSFM-T3

1.5 V

Not Qualified

600 V

20 V/us

15 mA

TO-220AB

e3

T1612SH

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

50 mA

THROUGH-HOLE

RECTANGULAR

1

2.5 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

16 A

R-PSFM-T3

2.5 V

Not Qualified

700 V

500 V/us

100 mA

e3

BTB06-700SW/F2

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

YES

SINGLE

SINGLE

PLASTIC/EPOXY

10 mA

GULL WING

RECTANGULAR

1

10 uA

3

110 Cel

-40 Cel

6 A

R-PSFM-G3

1.5 V

Not Qualified

700 V

50 V/us

25 mA

BTB08-800TW

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

5000 mA

THROUGH-HOLE

RECTANGULAR

1

3

TRIACs

110 Cel

-40 Cel

MATTE TIN

8 A

R-PSFM-T3

1.5 V

Not Qualified

800 V

1.8 V/us

20 V/us

15 mA

TO-220AB

e3

BTB04-700D

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

5 mA

THROUGH-HOLE

RECTANGULAR

1

.75 mA

3

TRIACs

110 Cel

-40 Cel

MATTE TIN

4 A

R-PSFM-T3

2.5 V

Not Qualified

700 V

15 mA

SENSITIVE GATE

TO-220AB

e3

T0505MH

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

5 mA

THROUGH-HOLE

RECTANGULAR

1

2 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

5 A

R-PSFM-T3

2.5 V

Not Qualified

600 V

10 V/us

15 mA

SENSITIVE GATE

TO-220AB

e3

Z0110DN5AA4

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

SMALL OUTLINE

YES

DUAL

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

25 mA

GULL WING

RECTANGULAR

1

.01 mA

4

TRIACs

125 Cel

-40 Cel

MATTE TIN

1 A

R-PDSO-G4

1

1.5 V

Not Qualified

400 V

5 V/us

25 mA

SENSITIVE GATE

e3

T0605MH

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

5 mA

THROUGH-HOLE

RECTANGULAR

1

2 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

6 A

R-PSFM-T3

2.5 V

Not Qualified

600 V

10 V/us

15 mA

SENSITIVE GATE

e3

T410-800T

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

10 uA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

4 A

R-PSFM-T3

1.5 V

Not Qualified

800 V

1.8 V/us

30 V/us

15 mA

SENSITIVE GATE

TO-220AB

e3

BTB06-700D

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

5 mA

THROUGH-HOLE

RECTANGULAR

1

.75 mA

3

TRIACs

110 Cel

-40 Cel

MATTE TIN

6 A

R-PSFM-T3

2.5 V

Not Qualified

700 V

15 mA

SENSITIVE GATE

TO-220AB

e3

BTB06-800B

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

100 mA

THROUGH-HOLE

RECTANGULAR

1

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

6 A

R-PSFM-T3

1.5 V

Not Qualified

800 V

10 V/us

250 V/us

50 mA

TO-220AB

e3

BTB08-600A

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

.75 mA

3

TRIACs

110 Cel

-40 Cel

MATTE TIN

8 A

R-PSFM-T3

2.5 V

Not Qualified

600 V

.00001 V/us

25 mA

SENSITIVE GATE

TO-220AB

e3

BTB08-400SW/F3

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

YES

SINGLE

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

10 mA

GULL WING

RECTANGULAR

1

10 uA

2

110 Cel

-40 Cel

8 A

R-PSFM-G2

1.5 V

Not Qualified

400 V

50 V/us

25 mA

T0509MH

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

2 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

5 A

R-PSFM-T3

2.5 V

Not Qualified

600 V

50 V/us

25 mA

SENSITIVE GATE

e3

BTB06-400T

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

5 mA

THROUGH-HOLE

RECTANGULAR

1

.75 mA

3

TRIACs

110 Cel

-40 Cel

MATTE TIN

6 A

R-PSFM-T3

2.5 V

Not Qualified

400 V

1 V/us

10 V/us

15 mA

SENSITIVE GATE

TO-220AB

e3

T610-700W

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

ISOLATED

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

3

TRIACs

125 Cel

-40 Cel

TIN LEAD

6 A

R-PSFM-T3

Not Qualified

700 V

SENSITIVE GATE

e0

T810-800W

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

ISOLATED

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

3

TRIACs

125 Cel

-40 Cel

TIN LEAD

8 A

R-PSFM-T3

Not Qualified

800 V

SENSITIVE GATE

e0

T0609MH

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

2 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

6 A

R-PSFM-T3

2.5 V

Not Qualified

600 V

50 V/us

25 mA

SENSITIVE GATE

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

BTB06-700SW

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

10 uA

3

TRIACs

110 Cel

-40 Cel

MATTE TIN

6 A

R-PSFM-T3

1.5 V

Not Qualified

700 V

2.7 V/us

50 V/us

25 mA

TO-220AB

e3

BTB08-800CRG

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

25 mA

THROUGH-HOLE

RECTANGULAR

1

1 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

8 A

R-PSFM-T3

1.3 V

Not Qualified

800 V

5 V/us

200 V/us

25 mA

TO-220AB

e3

T2513NH

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

50 mA

THROUGH-HOLE

RECTANGULAR

1

3 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

25 A

R-PSFM-T3

2.5 V

Not Qualified

800 V

500 V/us

150 mA

TO-220AB

e3

T810-400K

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

YES

SINGLE

SINGLE

PLASTIC/EPOXY

10 mA

GULL WING

RECTANGULAR

1

3

TRIACs

125 Cel

-40 Cel

TIN LEAD

8 A

R-PSFM-G3

Not Qualified

400 V

SENSITIVE GATE

e0

T2512DH

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

50 mA

THROUGH-HOLE

RECTANGULAR

1

3 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

25 A

R-PSFM-T3

2.5 V

Not Qualified

400 V

100 V/us

100 mA

TO-220AB

e3

T410-700H

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

IN-LINE

NO

SINGLE

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

.005 mA

3

TRIACs

125 Cel

-40 Cel

TIN

4 A

R-PSIP-T3

1.3 V

Not Qualified

700 V

40 V/us

15 mA

e3

T1013MH

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

50 mA

THROUGH-HOLE

RECTANGULAR

1

2 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

10 A

R-PSFM-T3

2.5 V

Not Qualified

600 V

500 V/us

150 mA

TO-220AB

e3

T4013NKS

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

UPPER

SINGLE

ISOLATED

PLASTIC/EPOXY

75 mA

SOLDER LUG

ROUND

1

.01 mA

3

TRIACs

125 Cel

-40 Cel

40 A

O-PUFM-D3

1.5 V

Not Qualified

800 V

5 V/us

500 V/us

75 mA

UL RECOGNIZED

BTB06-400A

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

.75 mA

3

TRIACs

110 Cel

-40 Cel

MATTE TIN

6 A

R-PSFM-T3

2.5 V

Not Qualified

400 V

.00001 V/us

25 mA

SENSITIVE GATE

TO-220AB

e3

BTB08-800BRG

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

50 mA

THROUGH-HOLE

RECTANGULAR

1

1 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

8 A

R-PSFM-T3

1.3 V

Not Qualified

800 V

10 V/us

400 V/us

50 mA

TO-220AB

e3

BTB06-600SW

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

10 uA

3

TRIACs

110 Cel

-40 Cel

MATTE TIN

6 A

R-PSFM-T3

1.5 V

Not Qualified

600 V

2.7 V/us

50 V/us

25 mA

TO-220AB

e3

BTB41-600B

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

100 mA

THROUGH-HOLE

RECTANGULAR

1

4 mA

3

TRIACs

110 Cel

-40 Cel

MATTE TIN

40 A

R-PSFM-T3

1

2.5 V

Not Qualified

600 V

80 mA

e3

T0509DH

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

2 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

5 A

R-PSFM-T3

2.5 V

Not Qualified

400 V

50 V/us

25 mA

SENSITIVE GATE

e3

BTB06-700S

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

.75 mA

3

TRIACs

110 Cel

-40 Cel

MATTE TIN

6 A

R-PSFM-T3

2.5 V

Not Qualified

700 V

1 V/us

10 V/us

25 mA

SENSITIVE GATE

TO-220AB

e3

BTB08-600SW/F2

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

YES

SINGLE

SINGLE

PLASTIC/EPOXY

10 mA

GULL WING

RECTANGULAR

1

10 uA

3

110 Cel

-40 Cel

Matte Tin (Sn)

8 A

R-PSFM-G3

1.5 V

Not Qualified

600 V

50 V/us

25 mA

e3

T0509SH

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

10 mA

THROUGH-HOLE

RECTANGULAR

1

2 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

5 A

R-PSFM-T3

2.5 V

Not Qualified

700 V

50 V/us

25 mA

SENSITIVE GATE

e3

Z0110NN

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

SMALL OUTLINE

YES

DUAL

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

25 mA

GULL WING

RECTANGULAR

1

.01 mA

4

TRIACs

125 Cel

-40 Cel

MATTE TIN

1 A

R-PDSO-G4

1

1.5 V

Not Qualified

800 V

5 V/us

25 mA

SENSITIVE GATE

e3

BTB08-700TW/F5

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

5 mA

THROUGH-HOLE

RECTANGULAR

1

10 uA

3

110 Cel

-40 Cel

8 A

R-PSFM-T3

1.5 V

Not Qualified

700 V

20 V/us

15 mA

TO-220AB

Z0110SN5AA4

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

SMALL OUTLINE

YES

DUAL

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

25 mA

GULL WING

RECTANGULAR

1

4

TRIACs

125 Cel

-40 Cel

MATTE TIN

1 A

R-PDSO-G4

1

1.3 V

Not Qualified

700 V

5 V/us

100 V/us

25 mA

SENSITIVE GATE

e3

BTB06-800TW

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

MAIN TERMINAL 2

PLASTIC/EPOXY

5 mA

THROUGH-HOLE

RECTANGULAR

1

3

TRIACs

110 Cel

-40 Cel

MATTE TIN

6 A

R-PSFM-T3

1.5 V

Not Qualified

800 V

1.3 V/us

20 V/us

15 mA

TO-220AB

e3

T2513NKS

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

UPPER

SINGLE

ISOLATED

PLASTIC/EPOXY

50 mA

SOLDER LUG

ROUND

1

.01 mA

3

TRIACs

125 Cel

-40 Cel

25 A

O-PUFM-D3

1.5 V

Not Qualified

800 V

5 V/us

500 V/us

75 mA

UL RECOGNIZED

Z0110SA

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

CYLINDRICAL

NO

BOTTOM

SINGLE

PLASTIC/EPOXY

25 mA

THROUGH-HOLE

ROUND

1

.01 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

1 A

O-PBCY-T3

1.5 V

Not Qualified

700 V

5 V/us

25 mA

SENSITIVE GATE

TO-92

e3

BTB08-700B

STMicroelectronics

4 QUADRANT LOGIC LEVEL TRIAC

FLANGE MOUNT

NO

SINGLE

SINGLE

PLASTIC/EPOXY

50 mA

THROUGH-HOLE

RECTANGULAR

1

.5 mA

3

TRIACs

125 Cel

-40 Cel

MATTE TIN

8 A

R-PSFM-T3

2.5 V

Not Qualified

700 V

10 V/us

100 V/us

50 mA

TO-220AB

e3

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.