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. 168-6667
Mfr. Part No.T2035H-6I
TWD45.20
Each (In a Tube of 50)
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20A Through Hole TO-220AB 35mA 600V 210A 3 1V 600V 35mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 102-3527
Mfr. Part No.BTA24-600CWRG
TWD67.00
Each (In a Tube of 50)
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25A Through Hole TO-220AB 35mA 600V 260A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 877-2624
Mfr. Part No.BTA26-600BWRG
TWD162.20
Each (In a Pack of 5)
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25A Through Hole TOP3 50mA 600V 260A 3 1.3V 600V 75mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm
RS Stock No. 687-1047
Mfr. Part No.BTA16-600CWRG
TWD59.00
Each (In a Pack of 5)
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16A Through Hole TO-220AB 35mA 600V 168A 3 1.3V 600V 35mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 484-2779
Mfr. Part No.BT137-600D,127
TWD22.00
Each (In a Pack of 5)
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8A Through Hole TO-220AB 10mA 600V 71A 3 1.5V 600V 10mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 123-1475
Mfr. Part No.FT0808MD TR
TWD10.20
Each (In a Pack of 20)
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8A Surface Mount DPAK (TO-252) 10mA 600V - 3 1.3V 600V 10mA 6.73 x 6.22 x 2.39mm 6.73mm 6.22mm 2.39mm
RS Stock No. 168-8852
Mfr. Part No.ACST830-8GTR
TWD18.30
Each (On a Reel of 1000)
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8A Surface Mount D2PAK (TO-263) 30mA 800V 84A 3 1V 800V 30mA 10.4 x 9.35 x 4.6mm 10.4mm 9.35mm 4.6mm
RS Stock No. 792-0695
Mfr. Part No.BT134W-600D,115
TWD11.20
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1A Surface Mount SOT-223 10mA 600V 11A 3+Tab 0.4V 600V 10mA 6.7 x 3.7 x 1.8mm 6.7mm 3.7mm 1.8mm
RS Stock No. 810-7332
Mfr. Part No.BTA12-600BRG
TWD44.40
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. 166-1461
Mfr. Part No.BT134W-600,115
TWD8.50
Each (On a Reel of 1000)
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1A Surface Mount SOT-223 (SC-73) 70mA 600V 11A 4 1.5V 600V 15mA 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS Stock No. 188-8264
Mfr. Part No.BTA24-800CWRG
TWD78.50
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25A Through Hole TO-220AB 50mA - 260A 3 - 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 168-8853
Mfr. Part No.ACST410-8FP
TWD25.30
Each (In a Tube of 50)
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4A Through Hole TO-220ABFP 10mA 800V 32A 3 1V 800V 20mA 10.4 x 4.6 x 16.4mm 10.4mm 4.6mm 16.4mm
RS Stock No. 171-9678
Mfr. Part No.Q6015L5TP
BrandLittelfuse
TWD95.00
Each (In a Pack of 2)
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15A Through Hole TO-220AB 50mA 600V 200A 3 2V - 70mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS Stock No. 687-1079
Mfr. Part No.ACS120-7SB-TR
TWD33.00
Each (In a Pack of 5)
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- Surface Mount DPAK (TO-252) - - - 3 - - - 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
New
RS Stock No. 202-4765
Mfr. Part No.ACST1210-7G
TWD2,230.00
1 Tube of 50
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12A Surface Mount D2PAK 35mA 700V - 3 0.9V - - - - - -
RS Stock No. 168-7041
Mfr. Part No.T1235T-8T
TWD43.90
Each (In a Tube of 50)
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12A Through Hole TO-220AB 35mA 800V 95A 3 1.3V 800V 40mA 10.4 x 4.6 x 15.75mm 10.4mm 4.6mm 15.75mm
RS Stock No. 165-7489
Mfr. Part No.T2535-600G-TR
TWD45.70
Each (On a Reel of 1000)
units
25A Surface Mount D2PAK (TO-263) 35mA 600V 260A 3 1.3V 600V 80mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 163-7351
Mfr. Part No.T3050H-6G-TR
TWD29.00
Each (On a Reel of 1000)
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30A Surface Mount D2PAK 50mA 600V 284A 2 + Tab 1V - 75mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 687-0909
Mfr. Part No.T2535-600G-TR
TWD88.50
Each (In a Pack of 2)
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25A Surface Mount D2PAK (TO-263) 35mA 600V 260A 3 1.3V 600V 50mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
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Mfr. Part No.BTA41-700BRG
TWD190.00
Each (In a Tube of 30)
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41A Through Hole TOP 50mA - 420A 3 - 700V 80mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm