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

...
Read more Read less

Filters

Viewing 41 - 60 of 618 products
Results per page
Description Price 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 Stock No. 484-2763
Mfr. Part No.BT137-600,127
MYR3.15
Each (In a Pack of 5)
units
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 Stock No. 165-5002
Mfr. Part No.FT0109MN RB
MYR0.626
Each (On a Reel of 2500)
units
1A Surface Mount SOT-223 10mA 600V - 3+Tab 1.3V 600V 10mA 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS Stock No. 484-2741
Mfr. Part No.BT136-600D,127
MYR2.888
Each (In a Pack of 5)
units
4A Through Hole TO-220AB 10mA 600V 27A 3 1.5V 600V 10mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 484-2735
Mfr. Part No.BT136-600,127
MYR2.138
Each (In a Pack of 5)
units
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 Stock No. 102-4086
Mfr. Part No.BTA40-800B
MYR35.90
Each (In a Bag of 25)
units
40A Panel Mount RD-91 100mA 800V 420A 3 1.3V 800V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 880-5279
Mfr. Part No.BTA06-600CWRG
MYR5.802
Each (In a Pack of 10)
units
6A Through Hole TO-220AB 35mA 600V 60A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 800-9730
Mfr. Part No.BTA16-800BW3G
BrandLittelfuse
MYR7.959
Each (In a Pack of 10)
units
16A Through Hole TO-220 50mA 800V 170A 3 1.7V 800V 60mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 294-3993
Mfr. Part No.BT137B-800F,118
MYR3.59
Each
units
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 Stock No. 102-3531
Mfr. Part No.BTA40-600B
MYR31.09
Each (In a Bag of 25)
units
40A Panel Mount RD-91 100mA 600V 420A 3 1.3V 600V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 168-6190
Mfr. Part No.BTB04-600SL
MYR3.119
Each (In a Tube of 50)
units
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 Stock No. 714-0518
Mfr. Part No.BTA41-800BRG
MYR27.68
Each
units
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 Stock No. 829-0438
Mfr. Part No.BTA08-600CWRG
MYR5.97
Each (In a Pack of 5)
units
8A Through Hole TO-220AB 35mA 800V 84A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 714-2609
Mfr. Part No.BTA26-800CWRG
MYR18.96
Each
units
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 Stock No. 877-2589
Mfr. Part No.AVS10CB
MYR7.864
Each (In a Pack of 5)
units
- Through Hole TO-220 - - - 3 - - - 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 509-415
Mfr. Part No.BT138X-600,127
MYR4.378
Each (In a Pack of 5)
units
12A Through Hole TO-220F 70mA 600V 105A 3 1.5V 600V 30mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS Stock No. 920-6370
Mfr. Part No.T405-600H
MYR3.297
Each (In a Tube of 75)
units
4A Through Hole IPAK (TO-251) 5mA 600V 31A 3 1.3V 600V 10mA 6.6 x 2.4 x 6.2mm 6.6mm 2.4mm 6.2mm
RS Stock No. 168-6668
Mfr. Part No.BTA24-600BWRG
MYR9.891
Each (In a Tube of 50)
units
25A Through Hole TO-220AB 50mA 600V 260A 3 1.3V 600V 75mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 463-331
Mfr. Part No.2N6075BG
BrandLittelfuse
MYR2.342
Each (In a Pack of 20)
units
4A Through Hole TO-225 5mA 600V 30A 3 2.5V 600V 15mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 687-1041
Mfr. Part No.BTB16-600BWRG
MYR7.046
Each (In a Pack of 5)
units
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 Stock No. 877-2630
Mfr. Part No.BTB08-600CWRG
MYR4.25
Each (In a Pack of 10)
units
8A Through Hole TO-220AB 35mA 600V 84A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm