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. 168-6240
Mfr. Part No.T435-600T
SGD1.281
Each (In a Tube of 50)
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4A Through Hole TO-220AB 35mA 600V 31A 3 1.3V 600V 35mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 168-9624
Mfr. Part No.BT136-600,127
SGD0.886
Each (In a Tube of 50)
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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. 687-1057
Mfr. Part No.T410-700T
SGD1.586
Each (In a Pack of 5)
units
4A Through Hole TO-220AB 10mA 700V 31A 3 1.3V 700V 15mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 829-0655
Mfr. Part No.BTA10-600BRG
SGD2.432
Each (In a Pack of 5)
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10A Through Hole TO-220AB 100mA 800V 105A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 178-1483
Mfr. Part No.BTB16-600BWRG
SGD2.081
Each (In a Tube of 50)
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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. 103-5139
Mfr. Part No.2N6073AG
BrandLittelfuse
SGD0.55
Each (In a Box of 500)
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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. 102-3584
Mfr. Part No.BTA12-600BWRG
SGD1.823
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12A Through Hole TO-220AB 50mA 800V 126A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 165-7646
Mfr. Part No.Z0410MF 1AA2
SGD0.859
Each (In a Bag of 250)
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4A Through Hole TO-202 25mA 600V 21A 3 1.3V 600V 25mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS Stock No. 714-2592
Mfr. Part No.BTA16-800BRG
SGD2.915
Each (In a Pack of 2)
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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
RS Stock No. 145-9257
Mfr. Part No.ACS108-6SA
SGD0.561
Each (In a Bag of 90)
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- Through Hole TO-92 - - - 3 - - - 4.7 x 4.4 x 3.7mm 4.7mm 4.4mm 3.7mm
RS Stock No. 687-0959
Mfr. Part No.T835-600G-TR
SGD1.89
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8A Surface Mount D2PAK (TO-263) 35mA 600V 84A 3 1.3V 600V 35mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 168-6837
Mfr. Part No.BTA06-600CRG
SGD1.666
Each (In a Tube of 50)
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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. 168-6678
Mfr. Part No.ACS120-7SB-TR
SGD0.653
Each (On a Reel of 2500)
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- Surface Mount DPAK (TO-252) - - - 3 - - - 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS Stock No. 168-6838
Mfr. Part No.BTA06-600TRG
SGD1.915
Each (In a Tube of 50)
units
6A Through Hole TO-220AB 5mA 600V 63A 3 1.5V 600V 15mA 10.5 x 4.82 x 9.02mm 10.5mm 4.82mm 9.02mm
RS Stock No. 169-0638
Mfr. Part No.BT137-600E,127
SGD0.959
Each (In a Tube of 50)
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8A Through Hole TO-220AB 25mA 600V 71A 3 1.5V 600V 20mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 102-4086
Mfr. Part No.BTA40-800B
SGD12.778
Each (In a Bag of 25)
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40A Panel Mount RD-91 100mA 800V 420A 3 1.3V 800V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 178-1432
Mfr. Part No.BTA140-600,127
SGD2.106
Each (In a Tube of 50)
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- - - - - - - - - - - - - -
RS Stock No. 102-4083
Mfr. Part No.BTA16-800BRG
SGD2.176
Each (In a Tube of 50)
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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
RS Stock No. 145-9666
Mfr. Part No.BTA16-600SWRG
SGD2.176
Each (In a Tube of 50)
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16A Through Hole TO-220AB 10mA 800V 168A 3 1.3V 600V 15mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 121-6474
Mfr. Part No.BTA16-800BW3G
BrandLittelfuse
SGD2.412
Each (In a Tube of 50)
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16A Through Hole TO-220 50mA 800V 170A 3 1.7V 800V 60mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm