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. 714-0502
Mfr. Part No.BTA16-600BRG
$4.25
Each (In a Pack of 2)
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16A Through Hole TO-220AB 100mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 168-9604
Mfr. Part No.BT138X-600E,127
$0.956
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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. 168-6786
Mfr. Part No.BTB24-600BWRG
$3.14
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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. 795-8690
Mfr. Part No.Z0107MA 1AA2
$0.845
Each (In a Pack of 25)
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1A Through Hole TO-92 7mA 600V 8.5A 3 1.3V - 10mA 4.7 x 3.7 x 4.4mm 4.7mm 3.7mm 4.4mm
RS Stock No. 168-6664
Mfr. Part No.BTA41-600BRG
$9.611
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40A Through Hole TOP3 100mA 600V 420A 3 1.3V 600V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 687-1007
Mfr. Part No.BTA41-600BRG
$11.01
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40A Through Hole TOP3 100mA 600V 420A 3 1.3V 600V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 169-0637
Mfr. Part No.BT136-600E,127
$0.84
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4A Through Hole TO-220AB 25mA 600V 27A 3 1.5V 600V 15mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 103-1071
Mfr. Part No.Z0107MA 1AA2
$0.372
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1A Through Hole TO-92 7mA 600V 8.5A 3 1.3V - 10mA 4.7 x 3.7 x 4.4mm 4.7mm 3.7mm 4.4mm
RS Stock No. 727-1111
Mfr. Part No.BT134-600D,127
$0.827
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4A Through Hole SIP 10mA 600V 27A 3 1.5V 600V 10mA 7.8 x 2.8 x 11.1mm 7.8mm 2.8mm 11.1mm
RS Stock No. 714-2631
Mfr. Part No.BTB24-800BWRG
$3.995
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25A Through Hole TO-220AB 50mA 800V 260A 3 1.3V 800V 75mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 168-7905
Mfr. Part No.T1235-600G
$2.552
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12A Surface Mount D2PAK (TO-263) 35mA 600V 3.9mA 3 1V - 35mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 169-0641
Mfr. Part No.MAC97A6,412
$0.156
Each (In a Bag of 1000)
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0.6A Through Hole SPT 7mA 400V 8.8A 3 2V 400V 10mA 4.8 x 4.2 x 5.2mm 4.8mm 4.2mm 5.2mm
RS Stock No. 168-6844
Mfr. Part No.BTB24-800BWRG
$3.602
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25A Through Hole TO-220AB 50mA 800V 260A 3 1.3V 800V 75mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 727-1149
Mfr. Part No.MAC97A6,412
$0.557
Each (In a Pack of 20)
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0.6A Through Hole SPT 7mA 400V 8.8A 3 2V 400V 10mA 4.8 x 4.2 x 5.2mm 4.8mm 4.2mm 5.2mm
RS Stock No. 178-1431
Mfr. Part No.BTA216-600B,127
$1.491
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- - - - - - - - - - - - - -
RS Stock No. 484-2814
Mfr. Part No.BT139-800,127
$1.618
Each (In a Pack of 5)
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16A Through Hole TO-220AB 70mA 800V 170A 3 1.5V 800V 45mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 102-3582
Mfr. Part No.BTB10-600BWRG
$1.764
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10A Through Hole TO-220AB 50mA 600V 105A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 714-0512
Mfr. Part No.BTB24-600BWRG
$4.12
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. 687-0915
Mfr. Part No.T1235-600G-TR
$2.625
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12A Surface Mount D2PAK (TO-263) 35mA 600V 126A 3 1.3V 600V 35mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 877-2611
Mfr. Part No.BTA16-600CRG
$2.552
Each (In a Pack of 10)
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16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm