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. 178-1398
Mfr. Part No.BTA26-800BRG
€3.408
Each (In a Tube of 30)
units
25A Through Hole TOP3 100mA 800V 260A 3 1.3V 800V 80mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm
RS Stock No. 188-8530
Mfr. Part No.BTB41-800BRG
€4.83
Each (In a Pack of 2)
units
41A Through Hole TOP 50mA - 420A 3 - 800V 80mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm
RS Stock No. 687-0912
Mfr. Part No.T1235-800G-TR
€1.255
Each (In a Pack of 2)
units
12A Surface Mount D2PAK (TO-263) 35mA 800V 126A 3 1.3V 800V 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
€1.20
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. 800-9730
Mfr. Part No.BTA16-800BW3G
BrandLittelfuse
€1.28
Each (In a Pack of 10)
units
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
RS Stock No. 202-5557
Mfr. Part No.T1635H-8G-TR
€0.46
Each (On a Reel of 1000)
units
16A Through Hole D²PAK 35mA 800V - 3 1.3V - - - - - -
New
RS Stock No. 213-3380
Mfr. Part No.T1605G-6I
€0.895
Each (In a Tube of 50)
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16A - TO-220AB 5mA - - 3 - - - - - - -
RS Stock No. 829-2711
Mfr. Part No.BTA20-600CWRG
€1.876
Each (In a Pack of 5)
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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. 484-2729
Mfr. Part No.BT134W-600,115
€0.336
Each (In a Pack of 10)
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1A Surface Mount SOT-223 (SC-73) 70mA 600V 11A 4 1.5V 600V 15mA 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS Stock No. 862-4926
Mfr. Part No.MAC15A8G
BrandLittelfuse
€1.166
Each (In a Pack of 10)
units
15A Through Hole TO-220AB 75mA 600V 150A 3 2.5V 600V 40mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 793-1320
Mfr. Part No.BTB24-800BRG
€2.11
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. 876-5749
Mfr. Part No.T1610T-8FP
€1.72
Each (In a Pack of 5)
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16A Through Hole TO-220ABFP 10mA 800V 126A 3 1.3V - 15mA 10.4 x 4.6 x 16.4mm 10.4mm 4.6mm 16.4mm
RS Stock No. 146-0402
Mfr. Part No.BTA312Y-600C,127
€0.924
Each (On a Reel of 50)
units
12A Through Hole TO-220AB 35mA 600V 100A 3 1.5V 600V 35mA 10.3 x 4.7 x 16mm 10.3mm 4.7mm 16 (With Tab)mm
RS Stock No. 145-9716
Mfr. Part No.BTA26-800BWRG
€3.573
Each (In a Tube of 50)
units
25A Through Hole TOP3 50mA 800V 250A 3 1.3V 800V 75mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm
RS Stock No. 165-7784
Mfr. Part No.T835-600G-TR
€0.479
Each (On a Reel of 1000)
units
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. 177-5177
Mfr. Part No.MAC12MG
BrandLittelfuse
€0.891
Each (In a Tube of 50)
units
12A Through Hole TO-220AB 35mA 600V 100A 3 1.5V 600V 40mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 192-4595
Mfr. Part No.T3050H-6G
€1.631
Each (In a Tube of 50)
units
30A Surface Mount D2PAK 50mA 600V 284A 3 1V - 75mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 2508958676
Mfr. Part No.NTE56026
€33.11
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