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. 168-8849
Mfr. Part No.T1610T-8FP
€1.442
Each (In a Tube of 50)
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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. 714-2621
Mfr. Part No.BTB08-600TWRG
€1.098
Each (In a Pack of 5)
units
8A Through Hole TO-220AB 5mA 600V 84A 3 1.3V 600V 10mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 145-8699
Mfr. Part No.BTB16-600BRG
€1.298
Each (In a Tube of 30)
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16A Through Hole TO-220AB 100mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 829-0655
Mfr. Part No.BTA10-600BRG
€1.358
Each (In a Pack of 5)
units
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. 168-7045
Mfr. Part No.T635T-8T
€0.216
Each (In a Tube of 50)
units
6A Through Hole TO-220AB 35mA 800V 47A 3 1.3V 800V 40mA 10.4 x 4.6 x 15.75mm 10.4mm 4.6mm 15.75mm
RS Stock No. 168-8595
Mfr. Part No.T835T-6I
€0.248
Each (In a Tube of 50)
units
8A Through Hole TO-220AB 35mA - 63A 3 1.3V - 40mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 795-8704
Mfr. Part No.Z0103MN 5AA4
€0.265
Each (In a Pack of 10)
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1A Surface Mount SOT-223 5mA 600V 8.5A 3+Tab 1.3V - 7mA 6.7 x 3.7 x 1.8mm 6.7mm 3.7mm 1.8mm
New
RS Stock No. 208-5175
Mfr. Part No.T810T-8G-TR
€0.542
Each (In a Pack of 25)
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8A Through Hole D²PAK 10mA 800V - 3 1.3V - - - - - -
RS Stock No. 509-504
Mfr. Part No.BT136X-600,127
€0.418
Each (In a Pack of 10)
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4A Through Hole TO-220F 70mA 600V 27A 3 1.5V 600V 15mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS Stock No. 146-0829
Mfr. Part No.BT134-600E,127
€0.394
Each (In a Tube of 50)
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4A Through Hole SIP 25mA 600V 4A 3 1.5V 600V 15mA 7.8 x 2.8 x 11.1mm 7.8mm 2.8mm 11.1mm
RS Stock No. 877-2618
Mfr. Part No.BTA12-800SWRG
€1.45
Each (In a Pack of 5)
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12A Through Hole TO-220AB 10mA 800V 126A 3 1.3V 800V 15mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 714-2631
Mfr. Part No.BTB24-800BWRG
€2.11
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. 509-522
Mfr. Part No.BT139B-600,118
€0.854
Each (In a Pack of 5)
units
16A Surface Mount D2PAK (TO-263) 70mA 600V 170A 3 1.5V 600V 45mA 10.3 x 9.4 x 4.5mm 10.3mm 9.4mm 4.5mm
RS Stock No. 168-6678
Mfr. Part No.ACS120-7SB-TR
€0.355
Each (On a Reel of 2500)
units
- Surface Mount DPAK (TO-252) - - - 3 - - - 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS Stock No. 168-6277
Mfr. Part No.Z0107MN 5AA4
€0.205
Each (On a Reel of 1000)
units
1A Surface Mount SOT-223 7mA 600V 8.5A 3+Tab 1.3V 600V 10mA 6.5 x 3.5 x 1.8mm 6.5mm 3.5mm 1.8mm
RS Stock No. 192-4593
Mfr. Part No.T2050H-6G
€1.049
Each (In a Tube of 50)
units
20A Surface Mount D2PAK 50mA 600V 210A 3 1V - 75mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 180-7116
Mfr. Part No.VO3063
BrandVishay
€0.324
Each (In a Pack of 10)
units
- Through Hole DIP 5mA 6V 1 (Non-Reptitive)A 6 22V 600V - 9 x 6.4 x 3.5mm 9mm 6.4mm 3.5mm
RS Stock No. 165-9794
Mfr. Part No.L4008D6RP
BrandLittelfuse
€0.563
Each (On a Reel of 2500)
units
8A Surface Mount DPAK (TO-252) 5 mA, 10 mA 400V 100A 3 1.3V 400V 10mA 6.73 x 7.49 x 2.41mm 6.73mm 7.49mm 2.41mm
RS Stock No. 166-1298
Mfr. Part No.BT134-800
€0.151
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. 177-7329
Mfr. Part No.BTA216-600B,127
€0.87
Each
units
16A Through Hole TO-220AB 50mA 600V 150A 3 1.5V 600V 60mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm