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. 877-2609
Mfr. Part No.BTA12-600TWRG
MYR5.19
Each (In a Pack of 10)
units
12A Through Hole TO-220AB 5mA 600V 126A 3 1.3V 600V 10mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 792-0728
Mfr. Part No.BTA204S-800E,118
MYR2.61
Each (On a Tape of 10)
units
4A Surface Mount DPAK (TO-252) 10mA 800V 27A 3 1.5V 800V 12mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 485-8651
Mfr. Part No.T835-600G
MYR6.426
Each (In a Pack of 5)
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. 800-9715
Mfr. Part No.BTA12-600BW3G
BrandLittelfuse
MYR7.524
Each (In a Pack of 10)
units
12A Through Hole TO-220 50mA 600V 105A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 165-5000
Mfr. Part No.FT0103MN00RB
MYR0.616
Each (On a Reel of 2500)
units
1A Surface Mount SOT-223 5mA 600V - 3+Tab 1.3V 600V 7mA 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS Stock No. 171-9673
Mfr. Part No.Q4004L3TP
BrandLittelfuse
MYR7.528
Each (In a Pack of 5)
units
4A Through Hole TO-220AB 10mA 400V 55A 3 1.3V - 20mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS Stock No. 714-2671
Mfr. Part No.Z0409MF 1AA2
MYR3.201
Each (In a Pack of 10)
units
4A Through Hole TO-202 10mA 600V 21A 3 1.3V 600V 10mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS Stock No. 145-9251
Mfr. Part No.BTB24-600BRG
MYR8.10
Each (In a Tube of 50)
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. 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. 177-5208
Mfr. Part No.2N6344G
BrandLittelfuse
MYR3.64
Each (In a Box of 500)
units
8A Through Hole TO-220AB 125mA 600V 100A 3 3V 600V 75mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 829-4023
Mfr. Part No.T1650H-6I
MYR6.92
Each (In a Pack of 5)
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
RS Stock No. 795-8997
Mfr. Part No.Z0110MN 5AA4
MYR2.53
Each (In a Pack of 10)
units
1A Surface Mount SOT-223 25mA 600V 8.5A 3+Tab 1.3V - 25mA 6.7 x 3.7 x 1.8mm 6.7mm 3.7mm 1.8mm
RS Stock No. 168-7846
Mfr. Part No.T435-600B
MYR3.631
Each (In a Tube of 75)
units
4A Surface Mount DPAK (TO-252) 35mA 600V 31A 3 1.3V - 35mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
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. 103-5703
Mfr. Part No.BT137-600,127
MYR2.305
Each (In a Tube of 50)
units
8A Through Hole TO-220AB 70mA 600V 71A 3 1.5V 600V 20mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 188-8530
Mfr. Part No.BTB41-800BRG
MYR24.245
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. 2508962580
Mfr. Part No.NTE56022
MYR126.39
Each
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RS Stock No. 2508958676
Mfr. Part No.NTE56026
MYR139.22
Each
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