A TRIAC (triode for alternating current) is a silicone 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 it work?
In basic terms a TRIAC is a low power 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 silicone 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 electronics applications and circuits.
On the TRIAC symbol there are three terminals. These terminals are,
MT1 Anode 1 (Main Terminal 1)
MT2 Anode 2 (Main Terminal 2)
Gate Terminal
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. 145-9608
Mfr. Part No.BTB08-600BWRG
Each (In a Tube of 30)
8A Through Hole TO-220AB 50mA 600V 84A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 714-2586
Mfr. Part No.BTA12-600SWRG
Each (In a Pack of 5)
12A Through Hole TO-220AB 10mA 800V 126A 3 1.3V 600V 15mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 165-6857
Mfr. Part No.Z0103MA 1AA2
Each (On a Reel of 2500)
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 Stock No. 145-9704
Mfr. Part No.BTB08-600CWRG
Each (In a Tube of 30)
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
RS Stock No. 198-4319
Mfr. Part No.BTA140-800,127
25A Through Hole TO-220AB 70mA 800V 209A 3 1.5V 800V 30mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 829-3806
Mfr. Part No.BTA06-600BWRG
Each (In a Pack of 10)
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 Stock No. 169-0641
Mfr. Part No.MAC97A6,412
Each (In a Bag of 1000)
0.6A Through Hole SPT 7mA 400V 8.8A 3 2V 400V 10mA 4.8 x 4.2 x 5.2mm 4.8mm 4.2mm 5.2mm
RS Stock No. 829-3948
Mfr. Part No.ACS108-6SA
Each (In a Pack of 10)
- Through Hole TO-92 - - - 3 - - - 4.7 x 4.4 x 3.7mm 4.7mm 4.4mm 3.7mm
RS Stock No. 168-8858
Mfr. Part No.BTB24-800CWRG
Each (In a Tube of 50)
25A Through Hole TO-220AB 35mA 800V 260A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 2508962580
Mfr. Part No.NTE56022
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RS Stock No. 2508958676
Mfr. Part No.NTE56026
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