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. 102-4119
Mfr. Part No.T410-600T
MYR3.864
Each (In a Tube of 50)
units
4A Through Hole TO-220AB 10mA 600V 31A 3 1.3V 600V 15mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 166-0325
Mfr. Part No.BT137X-800,127
MYR2.467
Each (In a Tube of 50)
units
8A Through Hole TO-220F 70mA 800V 71A 3 1.5V 800V 20mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS Stock No. 102-3532
Mfr. Part No.BTA40-700B
MYR35.164
Each (In a Bag of 25)
units
40A Panel Mount RD-91 100mA 700V 315A 3 1.5V 700V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 168-8094
Mfr. Part No.BTA20-600CWRG
MYR8.715
Each (In a Tube of 50)
units
20A Through Hole TO-220AB 35mA 700V 210A 3 1.5V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 829-2711
Mfr. Part No.BTA20-600CWRG
MYR10.248
Each (In a Pack of 5)
units
20A Through Hole TO-220AB 35mA 700V 210A 3 1.5V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 727-1120
Mfr. Part No.BT136-600E,127
MYR2.384
Each (In a Pack of 10)
units
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. 102-3527
Mfr. Part No.BTA24-600CWRG
MYR8.55
Each (In a Tube of 50)
units
25A Through Hole TO-220AB 35mA 600V 260A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 169-3287
Mfr. Part No.BTA40-700B
MYR40.86
Each
units
40A Panel Mount RD-91 100mA 700V 315A 3 1.5V 700V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 169-0637
Mfr. Part No.BT136-600E,127
MYR2.384
Each (In a Tube of 50)
units
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. 486-0935
Mfr. Part No.BTA24-600CWRG
MYR11.30
Each
units
25A Through Hole TO-220AB 35mA 600V 260A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 657-1867
Mfr. Part No.BT137X-800,127
MYR2.962
Each (In a Pack of 5)
units
8A Through Hole TO-220F 70mA 800V 71A 3 1.5V 800V 20mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS Stock No. 178-5037
Mfr. Part No.BT134-600
MYR1.449
Each (In a Tube of 120)
units
- - - - - - - - - - - - - -
RS Stock No. 284-905
Mfr. Part No.BT134-600
MYR2.72
Each
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4A Through Hole SOT-82 70mA 600V 27A 3 1.5V 600V 15mA 7.8 x 2.8 x 11.1mm 7.8mm 2.8mm 11.1mm
RS Stock No. 178-1434
Mfr. Part No.BT137-600D,127
MYR2.22
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 484-2741
Mfr. Part No.BT136-600D,127
MYR2.888
Each (In a Pack of 5)
units
4A Through Hole TO-220AB 10mA 600V 27A 3 1.5V 600V 10mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 123-1470
Mfr. Part No.FT0109MN RB
MYR0.78
Each (In a Pack of 100)
units
1A Surface Mount SOT-223 10mA 600V - 3+Tab 1.3V 600V 10mA 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS Stock No. 484-2735
Mfr. Part No.BT136-600,127
MYR2.138
Each (In a Pack of 5)
units
25A Through Hole TO-220AB 70mA 600V 27A 3 1.5V 600V 15mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 165-5002
Mfr. Part No.FT0109MN RB
MYR0.626
Each (On a Reel of 2500)
units
1A Surface Mount SOT-223 10mA 600V - 3+Tab 1.3V 600V 10mA 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS Stock No. 800-9768
Mfr. Part No.BTB16-800CW3G
BrandLittelfuse
MYR4.988
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. 168-9624
Mfr. Part No.BT136-600,127
MYR2.02
Each (In a Tube of 50)
units
25A Through Hole TO-220AB 70mA 600V 27A 3 1.5V 600V 15mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm