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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Omschrijving Prijs 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-stocknr. 714-2619
FabrikantnummerBTB06-600TRG
€ 0,974
Each (In a Pack of 5)
Aantal stuks
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-stocknr. 714-2678
FabrikantnummerZ0405NF 1AA2
€ 0,685
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Aantal stuks
4A Through Hole TO-202 5mA 800V 21A 3 1.3V 800V 5mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS-stocknr. 687-1088
FabrikantnummerACS102-6T1-TR
€ 0,366
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Aantal stuks
- Surface Mount SOIC - - - 8 - - - 5 x 4 x 1.25mm 5mm 4mm 1.25mm
RS-stocknr. 486-0935
FabrikantnummerBTA24-600CWRG
€ 2,12
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Aantal stuks
25A Through Hole TO-220AB 35mA 600V 260A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS-stocknr. 168-6787
FabrikantnummerBTA41-800BRG
€ 4,71
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Aantal stuks
40A Through Hole TOP3 100mA 800V 420A 3 1.3V 800V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS-stocknr. 714-0515
FabrikantnummerBTA26-600BRG
€ 3,41
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25A Through Hole TOP3 100mA 600V 260A 3 1.3V 600V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS-stocknr. 484-2763
FabrikantnummerBT137-600,127
€ 0,56
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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-stocknr. 165-7419
FabrikantnummerACS102-6T1-TR
€ 0,146
Each (On a Reel of 2500)
Aantal stuks
- Surface Mount SOIC - - - 8 - - - 5 x 4 x 1.25mm 5mm 4mm 1.25mm
RS-stocknr. 877-2652
FabrikantnummerBTB41-600BRG
€ 3,916
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40A Through Hole TOP3 100mA 600V 420A 3 1.3V 600V 80mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm
RS-stocknr. 166-1461
FabrikantnummerBT134W-600,115
€ 0,28
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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-stocknr. 168-6842
FabrikantnummerBTB06-600TRG
€ 0,829
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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-stocknr. 829-3948
FabrikantnummerACS108-6SA
€ 0,604
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- Through Hole TO-92 - - - 3 - - - 4.7 x 4.4 x 3.7mm 4.7mm 4.4mm 3.7mm
RS-stocknr. 102-3527
FabrikantnummerBTA24-600CWRG
€ 1,789
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25A Through Hole TO-220AB 35mA 600V 260A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS-stocknr. 145-8613
FabrikantnummerBTA26-600BRG
€ 2,899
Each (In a Tube of 30)
Aantal stuks
25A Through Hole TOP3 100mA 600V 260A 3 1.3V 600V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS-stocknr. 714-0518
FabrikantnummerBTA41-800BRG
€ 5,55
Each
Aantal stuks
40A Through Hole TOP3 100mA 800V 420A 3 1.3V 800V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS-stocknr. 687-1031
FabrikantnummerT810-600B
€ 1,232
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8A Surface Mount DPAK (TO-252) 10mA 600V 84A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS-stocknr. 714-2564
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€ 1,176
Each (In a Pack of 5)
Aantal stuks
8A Through Hole TO-220AB 100mA 800V 84A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS-stocknr. 102-4119
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€ 0,721
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Aantal stuks
4A Through Hole TO-220AB 10mA 600V 31A 3 1.3V 600V 15mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS-stocknr. 687-1044
FabrikantnummerT1635-600G
€ 1,965
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Aantal stuks
16A Surface Mount D2PAK (TO-263) 35mA 600V 168A 3 1.3V 600V 35mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS-stocknr. 262-494
FabrikantnummerBT139-600,127
€ 0,75
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16A Through Hole TO-220AB 70mA 600V 170A 3 1.5V 600V 45mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm