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. 714-0506
Mfr. Part No.BTA16-800BWRG
HK$22.895
Each (In a Pack of 2)
units
16A Through Hole TO-220AB 50mA 800V 168A 3 1.3V 800V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 168-6785
Mfr. Part No.BTA16-800BWRG
HK$19.187
Each (In a Tube of 50)
units
16A Through Hole TO-220AB 50mA 800V 168A 3 1.3V 800V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 714-2564
Mfr. Part No.BTA08-600BRG
HK$16.556
Each (In a Pack of 5)
units
8A Through Hole TO-220AB 100mA 800V 84A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 687-1041
Mfr. Part No.BTB16-600BWRG
HK$17.264
Each (In a Pack of 5)
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. 508-630
Mfr. Part No.BT131-800,116
HK$3.612
Each (In a Pack of 20)
units
1A Through Hole SPT 7mA 800V 13.8A 3 1.5V 800V 5mA 4.8 x 4.2 x 5.2mm 4.8mm 4.2mm 5.2mm
RS Stock No. 166-1234
Mfr. Part No.BT131-800,116
HK$1.239
Each (On a Reel of 5000)
units
1A Through Hole SPT 7mA 800V 13.8A 3 1.5V 800V 5mA 4.8 x 4.2 x 5.2mm 4.8mm 4.2mm 5.2mm
RS Stock No. 178-1483
Mfr. Part No.BTB16-600BWRG
HK$14.644
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. 714-2596
Mfr. Part No.BTA16-800CWRG
HK$18.986
Each (In a Pack of 5)
units
16A Through Hole TO-220AB 35mA 800V 168A 3 1.3V 800V 35mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 168-7134
Mfr. Part No.BTA24-800BWRG
HK$32.013
Each (In a Tube of 50)
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25A Through Hole TO-220AB 100mA 800V 260A 3 1.3V 600V 80mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 793-1327
Mfr. Part No.BTA24-800BWRG
HK$37.56
Each (In a Pack of 5)
units
25A Through Hole TO-220AB 100mA 800V 260A 3 1.3V 600V 80mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 714-2631
Mfr. Part No.BTB24-800BWRG
HK$30.29
Each (In a Pack of 2)
units
25A Through Hole TO-220AB 50mA 800V 260A 3 1.3V 800V 75mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 168-6844
Mfr. Part No.BTB24-800BWRG
HK$25.748
Each (In a Tube of 50)
units
25A Through Hole TO-220AB 50mA 800V 260A 3 1.3V 800V 75mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 805-1609
Mfr. Part No.MAC12HCMG
BrandLittelfuse
HK$15.352
Each (In a Pack of 10)
units
12A Through Hole TO-220AB 50mA 600V 100A 3 1.5V 800V 60mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 829-0343
Mfr. Part No.BTA08-600BWRG
HK$16.968
Each (In a Pack of 5)
units
8A Through Hole TO-220AB 50mA 800V 84A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 484-2741
Mfr. Part No.BT136-600D,127
HK$6.668
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. 877-2624
Mfr. Part No.BTA26-600BWRG
HK$62.016
Each (In a Pack of 5)
units
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. 727-1111
Mfr. Part No.BT134-600D,127
HK$5.24
Each (In a Pack of 10)
units
4A Through Hole SIP 10mA 600V 27A 3 1.5V 600V 10mA 7.8 x 2.8 x 11.1mm 7.8mm 2.8mm 11.1mm
RS Stock No. 168-8857
Mfr. Part No.BTA26-600BWRG
HK$51.896
Each (In a Tube of 30)
units
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. 166-1298
Mfr. Part No.BT134-800
HK$3.329
Each (In a Tube of 50)
units
4A Through Hole SIP 70mA 800V 27A 3 1.5V 800V 15mA 7.8 x 2.8 x 11.1mm 7.8mm 2.8mm 11.1mm
RS Stock No. 714-2592
Mfr. Part No.BTA16-800BRG
HK$24.735
Each (In a Pack of 2)
units
16A Through Hole TO-220AB 100mA 800V 168A 3 1.3V 800V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm