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. 877-3024
Mfr. Part No.T2050H-6T
€1.424
Each (In a Pack of 5)
units
20A Through Hole TO-220AB 50mA 600V 210A 3 1V 600V 75mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 168-8899
Mfr. Part No.T2050H-6T
€1.078
Each (In a Tube of 50)
units
20A Through Hole TO-220AB 50mA 600V 210A 3 1V 600V 75mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 178-5060
Mfr. Part No.ACS108-6SN-TR
€0.452
Each (On a Reel of 1000)
units
- Surface Mount SOT-223 - - - 3+Tab - - - 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS Stock No. 687-1081
Mfr. Part No.ACS108-6SN-TR
€0.915
Each (In a Pack of 10)
units
- Surface Mount SOT-223 - - - 3+Tab - - - 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS Stock No. 714-0502
Mfr. Part No.BTA16-600BRG
€1.435
Each (In a Pack of 2)
units
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. 168-6664
Mfr. Part No.BTA41-600BRG
€4.246
Each (In a Tube of 30)
units
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. 800-9715
Mfr. Part No.BTA12-600BW3G
BrandLittelfuse
€1.608
Each (In a Pack of 10)
units
12A Through Hole TO-220 50mA 600V 105A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 687-1007
Mfr. Part No.BTA41-600BRG
€5.01
Each
units
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. 102-3531
Mfr. Part No.BTA40-600B
€6.126
Each (In a Bag of 25)
units
40A Panel Mount RD-91 100mA 600V 420A 3 1.3V 600V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 103-8388
Mfr. Part No.BT137X-600D,127
€0.474
Each (In a Tube of 50)
units
8A Through Hole TO-220F 10mA 600V 71A 3 1.5V 600V 10mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS Stock No. 727-1139
Mfr. Part No.BT139-600E,127
€0.746
Each (In a Pack of 5)
units
16A Through Hole TO-220AB 25mA 600V 170A 3 1.5V 600V 45mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 127-0654
Mfr. Part No.BTA40-600B
€7.13
Each
units
40A Panel Mount RD-91 100mA 600V 420A 3 1.3V 600V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 103-5139
Mfr. Part No.2N6073AG
BrandLittelfuse
€0.292
Each (In a Box of 500)
units
4A Through Hole TO-225 30mA 400V 30A 3 2.5V 400V 30mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 800-9768
Mfr. Part No.BTB16-800CW3G
BrandLittelfuse
€0.897
Each (In a Pack of 10)
units
16A Through Hole TO-220 35mA 800V 170A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 330-5487
Mfr. Part No.BT137X-600D,127
€0.57
Each
units
8A Through Hole TO-220F 10mA 600V 71A 3 1.5V 600V 10mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS Stock No. 774-3432
Mfr. Part No.2N6073AG
BrandLittelfuse
€0.55
Each (In a Pack of 5)
units
4A Through Hole TO-225 30mA 400V 30A 3 2.5V 400V 30mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 177-5182
Mfr. Part No.BTB16-800CW3G
BrandLittelfuse
€0.896
Each (In a Tube of 50)
units
16A Through Hole TO-220 35mA 800V 170A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 169-0640
Mfr. Part No.BT139-600E,127
€0.627
Each (In a Tube of 50)
units
0.5A Through Hole TO-220AB 25mA 600V 170A 3 1.5V 600V 45mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 714-2678
Mfr. Part No.Z0405NF 1AA2
€0.685
Each (In a Pack of 10)
units
4A Through Hole TO-202 5mA 800V 21A 3 1.3V 800V 5mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS Stock No. 165-6742
Mfr. Part No.Z0109MN 5AA4
€0.108
Each (On a Reel of 1000)
units
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