TRIACs

A TRIAC (triode for alternating current) is a silicone semiconductor component with three terminals or legs that allow current to flow in either direction when triggered. TRIACs are a development of a similar family member the thyristor. However, unlike the thyristor which is unidirectional the TRIAC is able to control current over both halves of the sine wave making TRIACs bidirectional.
How does it work?
In basic terms a TRIAC is a low power to medium power semi-latching solid state switch. The device acts like two standard thyristors inversely connected in parallel or back to back. To activate the component a voltage needs to be applied to the gate terminal. Once the gate current is triggered a TRIAC will continue to conduct even if the supply to the gate is removed.
A TRIAC is a 4 layer silicone component that is PNPN in the positive direction and NPNP in the negative direction. The devices come in panel mount, surface mount and through hole mounting options in various package types to suit a wide variety electronics applications and circuits.
Terminals
On the TRIAC symbol there are three terminals. These terminals are,
MT1 Anode 1 (Main Terminal 1)
MT2 Anode 2 (Main Terminal 2)
Gate Terminal
Applications
TRIACs are widely used for switching and power control of AC systems. TRIACS are particularly useful in applications such as lighting dimmers as they enable the utilisation of each half-cycle of the AC wave. The solid state device can be used in a circuit as a simple on off device in a wide range of electronic applications. Some of the more common areas are,
• Temperature control
• Liquid level control
• Dimmers for domestic lighting
• Small motor control
• Speed control for electric fans

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Description Price Rated Average On-State Current Mounting Type Package Type Maximum Gate Trigger Current Repetitive Peak Reverse Voltage Surge Current Rating Pin Count Maximum Gate Trigger Voltage Repetitive Peak Forward Blocking Voltage Maximum Holding Current Dimensions Length Width Height
RS Stock No. 800-9715
Mfr. Part No.BTA12-600BW3G
BrandLittelfuse
€2.189
Each (In a Pack of 10)
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12A Through Hole TO-220 50mA 600V 105A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 800-9768
Mfr. Part No.BTB16-800CW3G
BrandLittelfuse
€1.078
Each (In a Pack of 10)
units
16A Through Hole TO-220 35mA 800V 170A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 103-5139
Mfr. Part No.2N6073AG
BrandLittelfuse
€0.224
Each (In a Box of 500)
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4A Through Hole TO-225 30mA 400V 30A 3 2.5V 400V 30mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 774-3432
Mfr. Part No.2N6073AG
BrandLittelfuse
€0.24
Each (In a Pack of 5)
units
4A Through Hole TO-225 30mA 400V 30A 3 2.5V 400V 30mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 177-5182
Mfr. Part No.BTB16-800CW3G
BrandLittelfuse
€0.98
Each (In a Tube of 50)
units
16A Through Hole TO-220 35mA 800V 170A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 177-5197
Mfr. Part No.2N6075BG
BrandLittelfuse
€0.388
Each (In a Bag of 500)
units
4A Through Hole TO-225 5mA 600V 30A 3 2.5V 600V 15mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 463-331
Mfr. Part No.2N6075BG
BrandLittelfuse
€0.60
Each (In a Pack of 20)
units
4A Through Hole TO-225 5mA 600V 30A 3 2.5V 600V 15mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 878-1895
Mfr. Part No.Q6012LH5
BrandLittelfuse
€1.78
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12A Through Hole TO-220 50mA 600V 120A 3 1.3V - 50mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS Stock No. 124-9962
Mfr. Part No.BTA12-600BW3G
BrandLittelfuse
€1.99
Each (In a Tube of 50)
units
12A Through Hole TO-220 50mA 600V 105A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 177-5190
Mfr. Part No.MAC228A8TG
BrandLittelfuse
€1.477
Each (In a Tube of 50)
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8A Through Hole TO-220AB 10mA 600V 80A 3 2.5V 600V 15mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 177-5191
Mfr. Part No.MAC8SDG
BrandLittelfuse
€0.348
Each (In a Tube of 50)
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8A Through Hole TO-220AB 5mA 400V 70A 3 1.5V 400V 10mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 177-5207
Mfr. Part No.T2800DG
BrandLittelfuse
€0.722
Each (In a Box of 500)
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8A Through Hole TO-220AB 60mA 400V 100A 3 2.5V 400V 30mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 806-2390
Mfr. Part No.MAC4DCMT4G
BrandLittelfuse
€0.57
Each (On a Tape of 20)
units
4A Surface Mount DPAK (TO-252) 35mA 600V 40A 3 1.3V 600V 35mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 177-5208
Mfr. Part No.2N6344G
BrandLittelfuse
€0.733
Each (In a Box of 500)
units
8A Through Hole TO-220AB 125mA 600V 100A 3 3V 600V 75mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 177-5192
Mfr. Part No.MAC8SNG
BrandLittelfuse
€0.765
Each (In a Tube of 50)
units
8A Through Hole TO-220AB 5mA 800V 70A 3 1.5V 800V 10mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 878-1902
Mfr. Part No.QK016LH3
BrandLittelfuse
€2.69
Each
units
16A Through Hole TO-220 20mA 1000V 200A 3 1.3V - 35mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS Stock No. 121-6472
Mfr. Part No.BTA16-600CW3G
BrandLittelfuse
€1.498
Each (In a Tube of 50)
units
16A Through Hole TO-220 35mA 600V 170A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 177-5188
Mfr. Part No.MAC16CNG
BrandLittelfuse
€0.504
Each (In a Tube of 50)
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16A Through Hole TO-220AB 35mA 800V 150A 3 1.5V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 878-1906
Mfr. Part No.QK016LH4
BrandLittelfuse
€1.775
Each (In a Pack of 500)
units
16A Through Hole TO-220 35mA 1000V 200A 3 1.3V - 50mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS Stock No. 800-9721
Mfr. Part No.BTA16-600CW3G
BrandLittelfuse
€1.648
Each (In a Pack of 10)
units
16A Through Hole TO-220 35mA 600V 170A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm