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. 877-2589
FabrikantnummerAVS10CB
€ 1,586
Each (In a Pack of 5)
Aantal stuks
- Through Hole TO-220 - - - 3 - - - 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS-stocknr. 202-5563
FabrikantnummerT2035H-8I
€ 1,41
Each (In a Pack of 5)
Aantal stuks
20A Through Hole TO-220AB insulated 35mA 800V - 3 1.3V - - - - - -
RS-stocknr. 124-3663
FabrikantnummerBCR8PM-12LG1A8#B00
€ 0,972
Each (In a Pack of 5)
Aantal stuks
8A Through Hole TO-220F 30mA - 80A 3 1.5V 600V - 10.5 x 4.5 x 17mm 10.5mm 4.5mm 17mm
RS-stocknr. 829-0416
FabrikantnummerBTA12-800CWRG
€ 1,358
Each (In a Pack of 5)
Aantal stuks
12A Through Hole TO-220AB 35mA 800V 126A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS-stocknr. 877-2564
FabrikantnummerACST410-8BTR
€ 0,485
Each (In a Pack of 10)
Aantal stuks
4A Surface Mount DPAK (TO-252) 10mA 800V 32A 3 1V 800V 20mA 6.73 x 6.22 x 2.4mm 6.73mm 6.22mm 2.4mm
RS-stocknr. 687-0909
FabrikantnummerT2535-600G-TR
€ 0,68
Each (In a Pack of 2)
Aantal stuks
25A Surface Mount D2PAK (TO-263) 35mA 600V 260A 3 1.3V 600V 50mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS-stocknr. 198-4303
FabrikantnummerBTA140-600,127
€ 1,20
Each
Aantal stuks
25A Through Hole TO-220AB 70mA 600V 209A 3 1.5V 600V 60mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS-stocknr. 171-9673
FabrikantnummerQ4004L3TP
FabrikantLittelfuse
€ 1,354
Each (In a Pack of 5)
Aantal stuks
4A Through Hole TO-220AB 10mA 400V 55A 3 1.3V - 20mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
Nieuw
RS-stocknr. 213-3384
FabrikantnummerT835H-8I
€ 0,729
Each (In a Pack of 10)
Aantal stuks
8A - TO-220AB 35mA - - 3 - - - - - - -
RS-stocknr. 202-5561
FabrikantnummerT2035H-8I
€ 1,185
Each (In a Tube of 50)
Aantal stuks
20A Through Hole TO-220AB insulated 35mA 800V - 3 1.3V - - - - - -
RS-stocknr. 2508962580
FabrikantnummerNTE56022
FabrikantNTE Electronics
€ 30,06
Each
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 2508958676
FabrikantnummerNTE56026
FabrikantNTE Electronics
€ 33,11
Each
Aantal stuks
- - - - - - - - - - - - - -