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. 103-5139
Mfr. Part No.2N6073AG
BrandLittelfuse
£0.263
Each (In a Box of 500)
Units
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. 774-3432
Mfr. Part No.2N6073AG
BrandLittelfuse
£0.496
Each (In a Pack of 5)
Units
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. 171-0138
Mfr. Part No.MAC4DLMT4G
BrandLittelfuse
£0.165
Each (On a Reel of 2500)
Units
4A Surface Mount DPAK (TO-252) 5mA 600V 40A 3 1.3V 600V 15mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 807-9934
Mfr. Part No.MAC4DLMT4G
BrandLittelfuse
£0.206
Each (In a Pack of 50)
Units
4A Surface Mount DPAK (TO-252) 5mA 600V 40A 3 1.3V 600V 15mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 544-9961
Mfr. Part No.2N6075AG
BrandLittelfuse
£0.50
Each
Units
4A Through Hole TO-225 10mA 600V 30A 3 2.5V 600V 15mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 177-5198
Mfr. Part No.2N6075AG
BrandLittelfuse
£0.263
Each (In a Box of 500)
Units
4A Through Hole TO-225 10mA 600V 30A 3 2.5V 600V 15mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 165-9917
Mfr. Part No.Q6030LH5
BrandLittelfuse
£1.829
Each (On a Reel of 500)
Units
30A Through Hole TO-220AB 50mA 600V 350A 3 2.75V 600V 75mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS Stock No. 793-1901
Mfr. Part No.Q6030LH5
BrandLittelfuse
£3.098
Each (In a Pack of 5)
Units
30A Through Hole TO-220AB 50mA 600V 350A 3 2.75V 600V 75mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS Stock No. 177-5197
Mfr. Part No.2N6075BG
BrandLittelfuse
£0.268
Each (In a Bag of 500)
Units
4A Through Hole TO-225 5mA 600V 30A 3 2.5V 600V 15mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 463-331
Mfr. Part No.2N6075BG
BrandLittelfuse
£0.394
Each (In a Pack of 20)
Units
4A Through Hole TO-225 5mA 600V 30A 3 2.5V 600V 15mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 774-3436
Mfr. Part No.2N6073BG
BrandLittelfuse
£0.244
Each (In a Pack of 5)
Units
4A Through Hole TO-225 20mA 400V 30A 3 2.5V 400V 30mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 177-5199
Mfr. Part No.2N6073BG
BrandLittelfuse
£0.23
Each (In a Box of 500)
Units
4A Through Hole TO-225 20mA 400V 30A 3 2.5V 400V 30mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 177-5177
Mfr. Part No.MAC12MG
BrandLittelfuse
£0.757
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. 774-3495
Mfr. Part No.MAC12MG
BrandLittelfuse
£0.758
Each (In a Pack of 5)
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. 800-9730
Mfr. Part No.BTA16-800BW3G
BrandLittelfuse
£1.153
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. 800-9715
Mfr. Part No.BTA12-600BW3G
BrandLittelfuse
£1.449
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. 177-5211
Mfr. Part No.MAC15A8G
BrandLittelfuse
£0.716
Each (In a Box of 500)
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. 862-4926
Mfr. Part No.MAC15A8G
BrandLittelfuse
£1.05
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. 177-5182
Mfr. Part No.BTB16-800CW3G
BrandLittelfuse
£0.808
Each (In a Tube of 50)
Units
16A Through Hole TO-220 35mA 800V 170A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 878-3908
Mfr. Part No.Q4008R4
BrandLittelfuse
£0.732
Each (In a Pack of 500)
Units
8A Through Hole TO-220 25mA 400V 100A 3 1.3V - 50mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm