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. 792-0709
FabrikantnummerBT137S-600D,118
€ 0,451
Each (In a Pack of 10)
Aantal stuks
8A Surface Mount DPAK (TO-252) 5mA 600V 71A 3 1V 600V 10mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS-stocknr. 714-2675
FabrikantnummerZ0410MF 1AA2
€ 0,623
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Aantal stuks
4A Through Hole TO-202 25mA 600V 21A 3 1.3V 600V 25mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS-stocknr. 169-0640
FabrikantnummerBT139-600E,127
€ 0,627
Each (In a Tube of 50)
Aantal stuks
0.5A Through Hole TO-220AB 25mA 600V 170A 3 1.5V 600V 45mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS-stocknr. 714-2625
FabrikantnummerBTB10-600BWRG
€ 1,018
Each (In a Pack of 5)
Aantal stuks
10A Through Hole TO-220AB 50mA 600V 105A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS-stocknr. 168-6845
FabrikantnummerT410-600B
€ 0,821
Each (In a Tube of 75)
Aantal stuks
4A Surface Mount DPAK (TO-252) 10mA 600V 31A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS-stocknr. 102-3531
FabrikantnummerBTA40-600B
€ 6,126
Each (In a Bag of 25)
Aantal stuks
40A Panel Mount RD-91 100mA 600V 420A 3 1.3V 600V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS-stocknr. 178-1484
FabrikantnummerBTA16-600CWRG
€ 1,309
Each (In a Tube of 50)
Aantal stuks
16A Through Hole TO-220AB 35mA 600V 168A 3 1.3V 600V 35mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS-stocknr. 727-1142
FabrikantnummerBT134-600E,127
€ 0,394
Each (In a Pack of 10)
Aantal stuks
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-stocknr. 168-6840
FabrikantnummerBTB06-600BWRG
€ 0,88
Each (In a Tube of 50)
Aantal stuks
6A Through Hole TO-220AB 50mA 600V 63A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS-stocknr. 816-7820
FabrikantnummerBT139-800E,127
€ 0,809
Each (In a Pack of 10)
Aantal stuks
20A Through Hole TO-220AB 25mA 800V 170A 3 1V 800V 45mA 10.3 x 4.7 x 16mm 10.3mm 4.7mm 16mm
RS-stocknr. 687-0919
FabrikantnummerT410-600B-TR
€ 0,78
Each (In a Pack of 10)
Aantal stuks
4A Surface Mount DPAK (TO-252) 10mA 600V 31A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS-stocknr. 165-7417
FabrikantnummerT410-600B-TR
€ 0,393
Each (On a Reel of 2500)
Aantal stuks
4A Surface Mount DPAK (TO-252) 10mA 600V 31A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS-stocknr. 146-0829
FabrikantnummerBT134-600E,127
€ 0,394
Each (In a Tube of 50)
Aantal stuks
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-stocknr. 727-1139
FabrikantnummerBT139-600E,127
€ 0,746
Each (In a Pack of 5)
Aantal stuks
16A Through Hole TO-220AB 25mA 600V 170A 3 1.5V 600V 45mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS-stocknr. 687-1047
FabrikantnummerBTA16-600CWRG
€ 1,554
Each (In a Pack of 5)
Aantal stuks
16A Through Hole TO-220AB 35mA 600V 168A 3 1.3V 600V 35mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS-stocknr. 168-6837
FabrikantnummerBTA06-600CRG
€ 1,009
Each (In a Tube of 50)
Aantal stuks
6A Through Hole TO-220AB 25mA 800V 63A 3 1.3V 800V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS-stocknr. 168-6671
FabrikantnummerT1635-600G
€ 1,664
Each (In a Tube of 50)
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. 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. 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. 687-1031
FabrikantnummerT810-600B
€ 1,232
Each (In a Pack of 5)
Aantal stuks
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