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. 792-0709
Mfr. Part No.BT137S-600D,118
SGD0.948
Each (In a Pack of 10)
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8A Surface Mount DPAK (TO-252) 5mA 600V 71A 3 1V 600V 10mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 485-6857
Mfr. Part No.BTA12-600CRG
SGD2.294
Each (In a Pack of 5)
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12A Through Hole TO-220AB 50mA 600V 126A 3 1.3V 600V 25mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 102-3532
Mfr. Part No.BTA40-700B
SGD12.524
Each (In a Bag of 25)
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40A Panel Mount RD-91 100mA 700V 315A 3 1.5V 700V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 165-9780
Mfr. Part No.BTA204S-800E,118
SGD0.428
Each (On a Reel of 2500)
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4A Surface Mount DPAK (TO-252) 10mA 800V 27A 3 1.5V 800V 12mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 792-0728
Mfr. Part No.BTA204S-800E,118
SGD0.923
Each (On a Tape of 10)
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4A Surface Mount DPAK (TO-252) 10mA 800V 27A 3 1.5V 800V 12mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 168-8854
Mfr. Part No.AVS10CB
SGD2.185
Each (In a Tube of 50)
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- Through Hole TO-220 - - - 3 - - - 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 877-2627
Mfr. Part No.BTA26-800BRG
SGD7.57
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25A Through Hole TOP3 100mA 800V 260A 3 1.3V 800V 80mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm
RS Stock No. 169-3287
Mfr. Part No.BTA40-700B
SGD14.53
Each
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40A Panel Mount RD-91 100mA 700V 315A 3 1.5V 700V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 877-2589
Mfr. Part No.AVS10CB
SGD2.91
Each (In a Pack of 5)
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- Through Hole TO-220 - - - 3 - - - 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 145-9301
Mfr. Part No.BTB12-600SWRG
SGD1.94
Each (In a Tube of 30)
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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 - - -
RS Stock No. 178-1398
Mfr. Part No.BTA26-800BRG
SGD5.94
Each (In a Tube of 30)
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25A Through Hole TOP3 100mA 800V 260A 3 1.3V 800V 80mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm
RS Stock No. 102-3526
Mfr. Part No.BTA16-600BWRG
SGD2.353
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. 330-5493
Mfr. Part No.BT138X-600E,127
SGD1.24
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12A Through Hole TO-220F 25mA 600V 105A 3 1.5V 600V 30mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS Stock No. 714-2586
Mfr. Part No.BTA12-600SWRG
SGD2.386
Each (In a Pack of 5)
units
12A Through Hole TO-220AB 10mA 800V 126A 3 1.3V 600V 15mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 168-6785
Mfr. Part No.BTA16-800BWRG
SGD2.583
Each (In a Tube of 50)
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16A Through Hole TO-220AB 50mA 800V 168A 3 1.3V 800V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 876-5749
Mfr. Part No.T1610T-8FP
SGD3.186
Each (In a Pack of 5)
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16A Through Hole TO-220ABFP 10mA 800V 126A 3 1.3V - 15mA 10.4 x 4.6 x 16.4mm 10.4mm 4.6mm 16.4mm
RS Stock No. 146-0402
Mfr. Part No.BTA312Y-600C,127
SGD1.974
Each (On a Reel of 50)
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12A Through Hole TO-220AB 35mA 600V 100A 3 1.5V 600V 35mA 10.3 x 4.7 x 16mm 10.3mm 4.7mm 16 (With Tab)mm
RS Stock No. 178-5060
Mfr. Part No.ACS108-6SN-TR
SGD0.83
Each (On a Reel of 1000)
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- Surface Mount SOT-223 - - - 3+Tab - - - 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS Stock No. 168-8040
Mfr. Part No.BTA12-800CWRG
SGD2.224
Each (In a Tube of 50)
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12A Through Hole TO-220AB 35mA 800V 126A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 792-0706
Mfr. Part No.BT139X-600F,127
SGD1.538
Each (In a Pack of 10)
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16A Through Hole TO-220F 70mA 600V 170A 3 1.5V 600V 45mA 10.3 x 4.6 x 15.8mm 10.3mm 4.6mm 15.8 (With Tab)mm