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. 145-8660
Mfr. Part No.BTA08-600SWRG
MYR5.11
Each (In a Tube of 50)
units
8A Through Hole TO-220AB 10mA 800V 84A 3 1.3V 600V 15mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 509-415
Mfr. Part No.BT138X-600,127
MYR4.378
Each (In a Pack of 5)
units
12A Through Hole TO-220F 70mA 600V 105A 3 1.5V 600V 30mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS Stock No. 714-2568
Mfr. Part No.BTA08-600CRG
MYR7.14
Each (In a Pack of 5)
units
8A Through Hole TO-220AB 50mA - - 3 1.3V 600V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 102-4086
Mfr. Part No.BTA40-800B
MYR35.90
Each (In a Bag of 25)
units
40A Panel Mount RD-91 100mA 800V 420A 3 1.3V 800V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 124-2292
Mfr. Part No.BT136-600D,127
MYR2.384
Each (In a Tube of 50)
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. 170-2412
Mfr. Part No.FT2514MH TU
MYR3.374
Each (In a Tube of 50)
units
25A Through Hole TO-220AB 35mA 600V - 3 1.3V 600V 35mA 10.36 x 4.67 x 15.35mm 10.36mm 4.67mm 15.35mm
RS Stock No. 102-4121
Mfr. Part No.BTA08-600CWRG
MYR5.314
Each (In a Tube of 50)
units
8A Through Hole TO-220AB 35mA 800V 84A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 168-8604
Mfr. Part No.T1650H-6I
MYR5.661
Each (In a Tube of 50)
units
16A Through Hole TO-220AB 50mA 600V 168A 3 1V 600V 75mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
New
RS Stock No. 215-3149
Mfr. Part No.T2650-6PF
MYR9.288
Each (In a Tray of 30)
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26A Through Hole TO-3PF 50mA 600V - 3 1.3V - - - - - -
RS Stock No. 509-493
Mfr. Part No.BT136S-600,118
MYR2.42
Each (In a Pack of 10)
units
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. 811-1098
Mfr. Part No.T1250H-6G
MYR4.294
Each (In a Pack of 5)
units
12A Surface Mount D2PAK (TO-263) 50mA 600V - 3 1V - 75mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 177-5191
Mfr. Part No.MAC8SDG
BrandLittelfuse
MYR3.46
Each (In a Tube of 50)
units
8A Through Hole TO-220AB 5mA 400V 70A 3 1.5V 400V 10mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 168-6843
Mfr. Part No.BTB08-600TWRG
MYR4.635
Each (In a Tube of 50)
units
8A Through Hole TO-220AB 5mA 600V 84A 3 1.3V 600V 10mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 877-2564
Mfr. Part No.ACST410-8BTR
MYR5.059
Each (In a Pack of 10)
units
4A Surface Mount DPAK (TO-252) 10mA 800V 32A 3 1V 800V 20mA 6.73 x 6.22 x 2.4mm 6.73mm 6.22mm 2.4mm
RS Stock No. 878-1895
Mfr. Part No.Q6012LH5
BrandLittelfuse
MYR8.936
Each (In a Pack of 10)
units
12A Through Hole TO-220 50mA 600V 120A 3 1.3V - 50mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS Stock No. 188-8298
Mfr. Part No.T2550-12I
MYR13.046
Each (In a Tube of 50)
units
25A Through Hole TO-220AB 50mA - 252A 3 - 1200V 60mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 810-3738
Mfr. Part No.T1635H-6T
MYR6.134
Each (In a Pack of 5)
units
16A Through Hole TO-220AB 35mA 600V 168A 3 1V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 168-6671
Mfr. Part No.T1635-600G
MYR8.621
Each (In a Tube of 50)
units
16A Surface Mount D2PAK (TO-263) 35mA 600V 168A 3 1.3V 600V 35mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 198-4303
Mfr. Part No.BTA140-600,127
MYR5.81
Each
units
25A Through Hole TO-220AB 70mA 600V 209A 3 1.5V 600V 60mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 192-4590
Mfr. Part No.ACST210-8B
MYR2.205
Each (In a Tube of 75)
units
2A Surface Mount DPAK 10mA 800V 8.4A 3 1.1V - 10mA 6.73 x 6.22 x 2.4mm 6.73mm 6.22mm 2.4mm