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. 687-0990
Mfr. Part No.TPDV1225RG
$19.21
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25A Through Hole TOP3 150mA 1200V 390A 3 1.5V 1200V - 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 774-3495
Mfr. Part No.MAC12MG
BrandLittelfuse
$1.624
Each (In a Pack of 5)
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12A Through Hole TO-220AB 35mA 600V 100A 3 1.5V 600V 40mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
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RS Stock No. 213-0883
Mfr. Part No.QV6016NH4RP
BrandLittelfuse
$3.493
Each (On a Reel of 500)
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200A Surface Mount TO-263 35mA 600V - 3 1.3V - - - - - -
RS Stock No. 178-1494
Mfr. Part No.BTA08-800BWRG
$2.12
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8A Through Hole TO-220AB 50mA 800V 84A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 168-8857
Mfr. Part No.BTA26-600BWRG
$7.392
Each (In a Tube of 30)
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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. 877-3030
Mfr. Part No.T405-800B-TR
$1.46
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4A Surface Mount DPAK (TO-252) 5mA 800V 31A 3 1.3V 800V 10mA 6.73 x 6.22 x 2.4mm 6.73mm 6.22mm 2.4mm
RS Stock No. 202-5557
Mfr. Part No.T1635H-8G-TR
$1.16
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16A Through Hole D²PAK 35mA 800V - 3 1.3V - - - - - -
RS Stock No. 806-2438
Mfr. Part No.MAC8SNG
BrandLittelfuse
$1.594
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8A Through Hole TO-220AB 5mA 800V 70A 3 1.5V 800V 10mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 829-2721
Mfr. Part No.T1210T-6I
$4.452
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12A Through Hole TO-220AB 10mA - 95A 3 1.3V - 10mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 166-1582
Mfr. Part No.BT136S-600,118
$0.665
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4A Surface Mount DPAK (TO-252) 70mA 600V 27A 3 1.5V 600V 15mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 188-8500
Mfr. Part No.BTA24-800CWRG
$4.736
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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. 124-2293
Mfr. Part No.BT138-600,127
$1.291
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12A Through Hole TO-220AB 70mA 600V 105A 3 1.5V 600V 30mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 486-3186
Mfr. Part No.T405-600H
$1.36
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4A Through Hole IPAK (TO-251) 5mA 600V 31A 3 1.3V 600V 10mA 6.6 x 2.4 x 6.2mm 6.6mm 2.4mm 6.2mm
RS Stock No. 124-0709
Mfr. Part No.CLA60MT1200NHB
BrandIXYS
$10.07
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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. 178-1422
Mfr. Part No.BT136X-800,127
$0.881
Each (In a Tube of 50)
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- - - - - - - - - - - - - -
RS Stock No. 171-9500
Mfr. Part No.Q6040K7TP
BrandLittelfuse
$14.984
Each (In a Tube of 250)
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40A Through Hole TO-218AC 100mA 600V 400A 3 2V - 100mA 16 x 4.78 x 21.21mm 16mm 4.78mm 21.21mm
RS Stock No. 180-7116
Mfr. Part No.VO3063
BrandVishay
$1.26
Each (In a Pack of 10)
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- Through Hole DIP 5mA 6V 1 (Non-Reptitive)A 6 22V 600V - 9 x 6.4 x 3.5mm 9mm 6.4mm 3.5mm
RS Stock No. 123-1497
Mfr. Part No.FT2516NJ TU
$1.412
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25A Through Hole TO-220AB 50mA 800V - 3 1.3V 800V 75mA 10.24 x 4.62 x 15.68mm 10.24mm 4.62mm 15.68mm
RS Stock No. 829-0466
Mfr. Part No.BTB06-600CRG
$1.804
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6A Through Hole TO-220AB 50mA 800V 63A 3 1.3V 600V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 171-9498
Mfr. Part No.Q6030LH5TP
BrandLittelfuse
$5.071
Each (In a Tube of 500)
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30A Through Hole TO-220AB 50mA 600V 350A 3 2.75V - 50mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm