TRIACs

A TRIAC (triode for alternating current) is a silicon semiconductor component with three terminals or legs that allow current to flow in either direction when triggered. TRIACs are a development of a similar family member the thyristor. However, unlike the thyristor which is unidirectional, the TRIAC is able to control current over both halves of the sine wave making TRIACs bidirectional.

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. Once the gate current is triggered a TRIAC will continue to conduct even if the supply to the gate is removed.

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.

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 dimmers 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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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. 485-6857
Mfr. Part No.BTA12-600CRG
MYR6.23
Each (In a Pack of 5)
units
12A Through Hole TO-220AB 50mA 600V 126A 3 1.3V 600V 25mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 168-6094
Mfr. Part No.BTA12-600CRG
MYR4.528
Each (In a Tube of 50)
units
12A Through Hole TO-220AB 50mA 600V 126A 3 1.3V 600V 25mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 169-7194
Mfr. Part No.MAC97A8/DG,412
MYR0.599
Each (On a Reel of 5000)
units
0.6A Through Hole TO-92 7mA 600V 8.8A 3 2V 600V 10mA 4.2 x 4.8 x 5.2mm 4.2mm 4.8mm 5.2mm
RS Stock No. 877-2624
Mfr. Part No.BTA26-600BWRG
MYR18.952
Each (In a Pack of 5)
units
25A Through Hole TOP3 50mA 600V 260A 3 1.3V 600V 75mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm
RS Stock No. 168-8857
Mfr. Part No.BTA26-600BWRG
MYR17.50
Each (In a Tube of 30)
units
25A Through Hole TOP3 50mA 600V 260A 3 1.3V 600V 75mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm
RS Stock No. 792-0759
Mfr. Part No.MAC97A8/DG,412
MYR0.708
Each (In a Pack of 40)
units
0.6A Through Hole TO-92 7mA 600V 8.8A 3 2V 600V 10mA 4.2 x 4.8 x 5.2mm 4.2mm 4.8mm 5.2mm
RS Stock No. 829-0633
Mfr. Part No.BTA25-600BW
MYR30.46
Each
units
25A Panel Mount RD-91 50mA 800V 260A 3 1.3V 600V 75mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 169-0638
Mfr. Part No.BT137-600E,127
MYR1.975
Each (In a Tube of 50)
units
8A Through Hole TO-220AB 25mA 600V 71A 3 1.5V 600V 20mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 727-1127
Mfr. Part No.BT137-600E,127
MYR2.426
Each (In a Pack of 5)
units
8A Through Hole TO-220AB 25mA 600V 71A 3 1.5V 600V 20mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 178-1394
Mfr. Part No.BTA25-600BW
MYR24.706
Each (In a Tube of 25)
units
25A Panel Mount RD-91 50mA 800V 260A 3 1.3V 600V 75mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 509-572
Mfr. Part No.BT131-600,412
MYR0.988
Each (In a Pack of 20)
units
1A Through Hole SPT 7mA 600V 13.8A 3 1.5V 600V 5mA 4.8 x 4.2 x 5.2mm 4.8mm 4.2mm 5.2mm
RS Stock No. 166-1298
Mfr. Part No.BT134-800
MYR1.664
Each (In a Tube of 50)
units
4A Through Hole SIP 70mA 800V 27A 3 1.5V 800V 15mA 7.8 x 2.8 x 11.1mm 7.8mm 2.8mm 11.1mm
RS Stock No. 168-6664
Mfr. Part No.BTA41-600BRG
MYR20.116
Each (In a Tube of 30)
units
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 Stock No. 792-0709
Mfr. Part No.BT137S-600D,118
MYR1.969
Each (In a Pack of 10)
units
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 Stock No. 714-0515
Mfr. Part No.BTA26-600BRG
MYR17.10
Each
units
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 Stock No. 166-1423
Mfr. Part No.BT131-600,412
MYR0.488
Each (In a Bag of 1000)
units
1A Through Hole SPT 7mA 600V 13.8A 3 1.5V 600V 5mA 4.8 x 4.2 x 5.2mm 4.8mm 4.2mm 5.2mm
RS Stock No. 687-1007
Mfr. Part No.BTA41-600BRG
MYR25.16
Each
units
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 Stock No. 145-8613
Mfr. Part No.BTA26-600BRG
MYR13.673
Each (In a Tube of 30)
units
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 Stock No. 486-5182
Mfr. Part No.T410-600T
MYR4.21
Each (In a Pack of 5)
units
4A Through Hole TO-220AB 10mA 600V 31A 3 1.3V 600V 15mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 165-9777
Mfr. Part No.BT137S-600D,118
MYR1.989
Each (On a Reel of 2500)
units
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