TRIACs

A TRIAC (triode for alternating current, also known as bidirectional triode thyristor or a bilateral triode thyristor) is a silicon semiconductor component with three terminals or legs that allow current to flow in either direction when triggered. TRIACs are a subset of thyristors and are similar to SCRs (silicon controlled rectifiers). However, unlike SCRs and other thyristors, which are unidirectional, the TRIAC is able to control current over both halves of the sine wave, making TRIACs bidirectional. A TRIAC is a 4-layer silicon 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 of electronics applications and circuits.RS Components have a curated range of TRIACs from a multitude of trusted brands, including Littelfuse, STMicroelectronics, WeEn Semiconductors Co., and many more.

How does a TRIAC work?

In basic terms, a TRIAC is a low-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, and TRIACs can be triggered by either negative or positive voltages, whereas SCRs require a positive voltage. Once the gate current is triggered, a TRIAC will continue to conduct even if the supply to the gate is removed.

On a TRIAC symbol, there are three terminals. These terminals are:

  • MT1 Anode 1 (Main Terminal 1)
  • MT2 Anode 2 (Main Terminal 2)
  • Gate Terminal

What are TRIACs used for?

TRIACs are widely used for switching and power control of AC systems. TRIACS are particularly useful in applications such as lighting dimmer switches, 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. 102-3583
Mfr. Part No.BTA10-600BWRG
€1.132
Each (In a Tube of 50)
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10A Through Hole TO-220AB 50mA 800V 105A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 124-0709
Mfr. Part No.CLA60MT1200NHB
BrandIXYS
€4.96
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30A Through Hole TO-247 ±80mA 1200V 410A 3 1.9V 1200V 60mA 16.24 x 5.3 x 21.45mm 16.24mm 5.3mm 21.45mm
RS Stock No. 877-2633
Mfr. Part No.BTB12-600CWRG
€0.949
Each (In a Pack of 10)
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12A Through Hole TO-220AB 35mA 600V 126A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 102-4086
Mfr. Part No.BTA40-800B
€7.042
Each (In a Bag of 25)
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40A Panel Mount RD-91 100mA 800V 420A 3 1.3V 800V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 714-2619
Mfr. Part No.BTB06-600TRG
€0.974
Each (In a Pack of 5)
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6A Through Hole TO-220AB 5mA 600V 63A 3 1.5V 600V 15mA 10.5 x 4.82 x 9.02mm 10.5mm 4.82mm 9.02mm
RS Stock No. 168-7877
Mfr. Part No.BTA12-600BRG
€1.189
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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. 880-5279
Mfr. Part No.BTA06-600CWRG
€0.956
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6A Through Hole TO-220AB 35mA 600V 60A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 169-0638
Mfr. Part No.BT137-600E,127
€0.459
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8A Through Hole TO-220AB 25mA 600V 71A 3 1.5V 600V 20mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 168-6842
Mfr. Part No.BTB06-600TRG
€0.829
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6A Through Hole TO-220AB 5mA 600V 63A 3 1.5V 600V 15mA 10.5 x 4.82 x 9.02mm 10.5mm 4.82mm 9.02mm
RS Stock No. 714-2564
Mfr. Part No.BTA08-600BRG
€1.176
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8A Through Hole TO-220AB 100mA 800V 84A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 102-3526
Mfr. Part No.BTA16-600BWRG
€1.211
Each (In a Tube of 50)
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16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 810-7332
Mfr. Part No.BTA12-600BRG
€1.189
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. 727-1127
Mfr. Part No.BT137-600E,127
€0.56
Each (In a Pack of 5)
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8A Through Hole TO-220AB 25mA 600V 71A 3 1.5V 600V 20mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 486-0907
Mfr. Part No.BTA16-600BWRG
€1.482
Each (In a Pack of 5)
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16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 294-3993
Mfr. Part No.BT137B-800F,118
€0.67
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8A Surface Mount D2PAK (TO-263) 70mA 800V 71A 3 1.5V 800V 20mA 10.3 x 9.4 x 4.5mm 10.3mm 9.4mm 4.5mm
RS Stock No. 168-8917
Mfr. Part No.BTA06-600CWRG
€0.955
Each (In a Tube of 50)
units
6A Through Hole TO-220AB 35mA 600V 60A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 168-4563
Mfr. Part No.CLA60MT1200NHB
BrandIXYS
€4.227
Each (In a Tube of 30)
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30A Through Hole TO-247 ±80mA 1200V 410A 3 1.9V 1200V 60mA 16.24 x 5.3 x 21.45mm 16.24mm 5.3mm 21.45mm
RS Stock No. 795-9205
Mfr. Part No.Z0109MN 5AA4
€0.274
Each (In a Pack of 25)
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1A Surface Mount SOT-223 10mA 600V 8.5A 3+Tab 1.3V - 10mA 6.7 x 3.7 x 1.8mm 6.7mm 3.7mm 1.8mm
RS Stock No. 714-2570
Mfr. Part No.BTA10-600BWRG
€1.332
Each (In a Pack of 5)
units
10A Through Hole TO-220AB 50mA 800V 105A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 714-2603
Mfr. Part No.BTA40-800B
€8.43
Each
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40A Panel Mount RD-91 100mA 800V 420A 3 1.3V 800V 80mA 40 x 27 x 14mm 40mm 27mm 14mm