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. 168-6837
Mfr. Part No.BTA06-600CRG
MYR5.303
Each (In a Tube of 50)
units
6A Through Hole TO-220AB 25mA 800V 63A 3 1.3V 800V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 177-5197
Mfr. Part No.2N6075BG
BrandLittelfuse
MYR1.595
Each (In a Bag of 500)
units
4A Through Hole TO-225 5mA 600V 30A 3 2.5V 600V 15mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 145-9704
Mfr. Part No.BTB08-600CWRG
MYR4.515
Each (In a Tube of 30)
units
8A Through Hole TO-220AB 35mA 600V 84A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 687-1029
Mfr. Part No.BTA24-600BWRG
MYR9.305
Each (In a Pack of 2)
units
25A Through Hole TO-220AB 50mA 600V 260A 3 1.3V 600V 75mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
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. 486-0957
Mfr. Part No.BTB04-600SL
MYR3.676
Each (In a Pack of 5)
units
4A Through Hole TO-220AB 25mA 600V 38A 3 1.3V 600V 15mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 168-6787
Mfr. Part No.BTA41-800BRG
MYR23.641
Each (In a Tube of 30)
units
40A Through Hole TOP3 100mA 800V 420A 3 1.3V 800V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 330-5487
Mfr. Part No.BT137X-600D,127
MYR3.54
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. 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. 103-1576
Mfr. Part No.BTA26-800CWRG
MYR18.176
Each (In a Tube of 30)
units
25A Through Hole TOP3 35mA 800V 260A 3 1.3V 800V 50mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 714-2558
Mfr. Part No.BTA06-600CRG
MYR6.216
Each (In a Pack of 5)
units
6A Through Hole TO-220AB 25mA 800V 63A 3 1.3V 800V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
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. 178-1483
Mfr. Part No.BTB16-600BWRG
MYR5.528
Each (In a Tube of 50)
units
16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 486-3186
Mfr. Part No.T405-600H
MYR3.896
Each (In a Pack of 5)
units
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. 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. 168-8854
Mfr. Part No.AVS10CB
MYR6.836
Each (In a Tube of 50)
units
- Through Hole TO-220 - - - 3 - - - 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 103-8388
Mfr. Part No.BT137X-600D,127
MYR2.29
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. 810-3609
Mfr. Part No.TPDV640RG
MYR39.59
Each (In a Pack of 2)
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40A Through Hole TOP3 200mA 600V 590A 3 1.5V 600V 50mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm
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. 168-7868
Mfr. Part No.TPDV640RG
MYR34.11
Each (In a Tube of 30)
units
40A Through Hole TOP3 200mA 600V 590A 3 1.5V 600V 50mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm