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. 484-2735
FabrikantnummerBT136-600,127
€ 0,508
Each (In a Pack of 5)
Aantal stuks
25A Through Hole TO-220AB 70mA 600V 27A 3 1.5V 600V 15mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS-stocknr. 165-6857
FabrikantnummerZ0103MA 1AA2
€ 0,191
Each (On a Reel of 2500)
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
RS-stocknr. 795-8521
FabrikantnummerZ0103MA 1AA2
€ 0,395
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
RS-stocknr. 484-2779
FabrikantnummerBT137-600D,127
€ 0,57
Each (In a Pack of 5)
Aantal stuks
8A Through Hole TO-220AB 10mA 600V 71A 3 1.5V 600V 10mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS-stocknr. 687-1007
FabrikantnummerBTA41-600BRG
€ 5,01
Each
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. 168-6664
FabrikantnummerBTA41-600BRG
€ 4,246
Each (In a Tube of 30)
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. 103-1576
FabrikantnummerBTA26-800CWRG
€ 3,408
Each (In a Tube of 30)
Aantal stuks
25A Through Hole TOP3 35mA 800V 260A 3 1.3V 800V 50mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS-stocknr. 714-2609
FabrikantnummerBTA26-800CWRG
€ 4,01
Each
Aantal stuks
25A Through Hole TOP3 35mA 800V 260A 3 1.3V 800V 50mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS-stocknr. 124-3660
FabrikantnummerBCR3PM-12LA#B00
€ 1,00
Each (In a Pack of 5)
Aantal stuks
3A Through Hole TO-220F 20mA - 30A 3 1.5V 600V - 10.5 x 4.5 x 17mm 10.5mm 4.5mm 17mm
RS-stocknr. 102-4086
FabrikantnummerBTA40-800B
€ 7,042
Each (In a Bag of 25)
Aantal stuks
40A Panel Mount RD-91 100mA 800V 420A 3 1.3V 800V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS-stocknr. 168-8107
FabrikantnummerBTA06-600BWRG
€ 1,002
Each (In a Tube of 50)
Aantal stuks
6A Through Hole TO-220AB 50mA 800V 63A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS-stocknr. 714-2603
FabrikantnummerBTA40-800B
€ 8,18
Each
Aantal stuks
40A Panel Mount RD-91 100mA 800V 420A 3 1.3V 800V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS-stocknr. 145-9251
FabrikantnummerBTB24-600BRG
€ 1,664
Each (In a Tube of 50)
Aantal stuks
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-stocknr. 829-0481
FabrikantnummerBTB24-600BRG
€ 1,964
Each (In a Pack of 5)
Aantal stuks
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-stocknr. 829-3806
FabrikantnummerBTA06-600BWRG
€ 1,002
Each (In a Pack of 10)
Aantal stuks
6A Through Hole TO-220AB 50mA 800V 63A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS-stocknr. 165-9780
FabrikantnummerBTA204S-800E,118
€ 0,23
Each (On a Reel of 2500)
Aantal stuks
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-stocknr. 294-3993
FabrikantnummerBT137B-800F,118
€ 0,67
Each
Aantal stuks
8A Surface Mount D2PAK (TO-263) 70mA 800V 71A 3 1.5V 800V 20mA 10.3 x 9.4 x 4.5mm 10.3mm 9.4mm 4.5mm
RS-stocknr. 165-9946
FabrikantnummerBT134W-600D,115
€ 0,28
Each (On a Reel of 1000)
Aantal stuks
1A Surface Mount SOT-223 10mA 600V 11A 3+Tab 0.4V 600V 10mA 6.7 x 3.7 x 1.8mm 6.7mm 3.7mm 1.8mm
RS-stocknr. 792-0728
FabrikantnummerBTA204S-800E,118
€ 0,518
Each (On a Tape of 10)
Aantal stuks
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-stocknr. 166-1265
FabrikantnummerBT137B-800F,118
€ 0,258
Each (On a Reel of 800)
Aantal stuks
8A Surface Mount D2PAK (TO-263) 70mA 800V 71A 3 1.5V 800V 20mA 10.3 x 9.4 x 4.5mm 10.3mm 9.4mm 4.5mm