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. 810-7332
Mfr. Part No.BTA12-600BRG
SGD1.149
Each (In a Pack of 10)
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12A Through Hole TO-220AB 50 mA, 100 mA 600V 126A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 168-7877
Mfr. Part No.BTA12-600BRG
SGD0.965
Each (In a Tube of 50)
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12A Through Hole TO-220AB 50 mA, 100 mA 600V 126A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 714-0512
Mfr. Part No.BTB24-600BWRG
SGD2.965
Each (In a Pack of 2)
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25A Through Hole TO-220AB 50mA 600V 260A 3 1.3V 600V 75mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 168-6786
Mfr. Part No.BTB24-600BWRG
SGD1.864
Each (In a Tube of 50)
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25A Through Hole TO-220AB 50mA 600V 260A 3 1.3V 600V 75mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 509-572
Mfr. Part No.BT131-600
SGD0.234
Each (In a Pack of 20)
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1A Through Hole SPT 7mA 600V 13.8A 3 1.5V 600V 5mA 4.8 x 4.2 x 5.2mm 4.8mm 4.2mm 5.2mm
RS Stock No. 166-1423
Mfr. Part No.BT131-600
SGD0.176
Each (In a Bag of 1000)
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1A Through Hole SPT 7mA 600V 13.8A 3 1.5V 600V 5mA 4.8 x 4.2 x 5.2mm 4.8mm 4.2mm 5.2mm
RS Stock No. 178-1386
Mfr. Part No.BTA25-600B
SGD8.98
Each (In a Bag of 25)
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25A Panel Mount RD-91 100mA 800V 260A 3 1.3V 600V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 829-4014
Mfr. Part No.BTA25-600B
SGD9.22
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25A Panel Mount RD-91 100mA 800V 260A 3 1.3V 600V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 127-0654
Mfr. Part No.BTA40-600B
SGD10.13
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40A Panel Mount RD-91 100mA 600V 420A 3 1.3V 600V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 102-3531
Mfr. Part No.BTA40-600B
SGD9.287
Each (In a Bag of 25)
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40A Panel Mount RD-91 100mA 600V 420A 3 1.3V 600V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 484-2763
Mfr. Part No.BT137-600,127
SGD0.928
Each (In a Pack of 5)
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8A Through Hole TO-220AB 70mA 600V 71A 3 1.5V 600V 20mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 714-0518
Mfr. Part No.BTA41-800BRG
SGD8.02
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units
40A Through Hole TOP3 100mA 800V 420A 3 1.3V 800V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 168-6787
Mfr. Part No.BTA41-800BRG
SGD7.572
Each (In a Tube of 30)
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40A Through Hole TOP3 100mA 800V 420A 3 1.3V 800V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 178-1394
Mfr. Part No.BTA25-600BW
SGD8.884
Each (In a Tube of 25)
units
25A Panel Mount RD-91 50mA 800V 260A 3 1.3V 600V 75mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 177-5221
Mfr. Part No.MAC4DCNT4G
BrandLittelfuse
SGD1.098
Each (On a Reel of 2500)
units
4A Surface Mount DPAK (TO-252) 35mA 800V 40A 3 1.3V 800V 35mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 829-0633
Mfr. Part No.BTA25-600BW
SGD9.61
Each
units
25A Panel Mount RD-91 50mA 800V 260A 3 1.3V 600V 75mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 806-2403
Mfr. Part No.MAC4DCNT4G
BrandLittelfuse
SGD2.039
Each (In a Pack of 20)
units
4A Surface Mount DPAK (TO-252) 35mA 800V 40A 3 1.3V 800V 35mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 484-2741
Mfr. Part No.BT136-600D,127
SGD0.594
Each (In a Pack of 5)
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4A Through Hole TO-220AB 10mA 600V 27A 3 1.5V 600V 10mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 877-2637
Mfr. Part No.BTB12-600SWRG
SGD1.843
Each (In a Pack of 10)
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12A Through Hole TO-220AB 10mA 600V 126A 3 1.3V 600V 15mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 877-2589
Mfr. Part No.AVS10CB
SGD3.878
Each (In a Pack of 5)
units
- Through Hole TO-220 - - - 3 - - - 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
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