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. 877-3024
FabrikantnummerT2050H-6T
€ 1,406
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20A Through Hole TO-220AB 50mA 600V 210A 3 1V 600V 75mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS-stocknr. 168-8899
FabrikantnummerT2050H-6T
€ 1,189
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Aantal stuks
20A Through Hole TO-220AB 50mA 600V 210A 3 1V 600V 75mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS-stocknr. 687-1041
FabrikantnummerBTB16-600BWRG
€ 1,498
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16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS-stocknr. 178-1483
FabrikantnummerBTB16-600BWRG
€ 1,269
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16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS-stocknr. 168-9600
FabrikantnummerBTA212-600B,127
€ 0,652
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12A Through Hole TO-220AB 50mA 600V 105A 3 1.5V 600V 60mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS-stocknr. 177-7335
FabrikantnummerBTA212-600B,127
€ 1,08
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12A Through Hole TO-220AB 50mA 600V 105A 3 1.5V 600V 60mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS-stocknr. 687-1035
FabrikantnummerZ0405MF 1AA2
€ 0,72
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4A Through Hole TO-202 5mA 600V 21A 3 1.3V 600V 5mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS-stocknr. 145-9591
FabrikantnummerZ0405MF 1AA2
€ 0,538
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4A Through Hole TO-202 5mA 600V 21A 3 1.3V 600V 5mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS-stocknr. 145-8698
FabrikantnummerBTB12-600CWRG
€ 1,062
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12A Through Hole TO-220AB 35mA 600V 126A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS-stocknr. 877-2633
FabrikantnummerBTB12-600CWRG
€ 1,118
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12A Through Hole TO-220AB 35mA 600V 126A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS-stocknr. 486-0957
FabrikantnummerBTB04-600SL
€ 0,924
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4A Through Hole TO-220AB 25mA 600V 38A 3 1.3V 600V 15mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS-stocknr. 165-6742
FabrikantnummerZ0109MN 5AA4
€ 0,15
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1A Surface Mount SOT-223 10mA 600V 8.5A 3+Tab 1.3V - 10mA 6.7 x 3.7 x 1.8mm 6.7mm 3.7mm 1.8mm
RS-stocknr. 795-9205
FabrikantnummerZ0109MN 5AA4
€ 0,33
Each (In a Pack of 25)
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1A Surface Mount SOT-223 10mA 600V 8.5A 3+Tab 1.3V - 10mA 6.7 x 3.7 x 1.8mm 6.7mm 3.7mm 1.8mm
RS-stocknr. 168-6190
FabrikantnummerBTB04-600SL
€ 0,789
Each (In a Tube of 50)
Aantal stuks
4A Through Hole TO-220AB 25mA 600V 38A 3 1.3V 600V 15mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS-stocknr. 486-3215
FabrikantnummerT435-600T
€ 0,90
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4A Through Hole TO-220AB 35mA 600V 31A 3 1.3V 600V 35mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS-stocknr. 102-3526
FabrikantnummerBTA16-600BWRG
€ 1,372
Each (In a Tube of 50)
Aantal stuks
16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS-stocknr. 486-0907
FabrikantnummerBTA16-600BWRG
€ 1,612
Each (In a Pack of 5)
Aantal stuks
16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS-stocknr. 168-6240
FabrikantnummerT435-600T
€ 0,764
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Aantal stuks
4A Through Hole TO-220AB 35mA 600V 31A 3 1.3V 600V 35mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS-stocknr. 687-1007
FabrikantnummerBTA41-600BRG
€ 6,07
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Aantal stuks
40A Through Hole TOP3 100mA 600V 420A 3 1.3V 600V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS-stocknr. 795-8521
FabrikantnummerZ0103MA 1AA2
€ 0,482
Each (In a Pack of 25)
Aantal stuks
1A Through Hole TO-92 5mA 600V 8.5A 3 1.3V - 7mA 4.7 x 3.7 x 4.4mm 4.7mm 3.7mm 4.4mm