TRIACs

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.
Terminals
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
Applications
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. 687-1079
Mfr. Part No.ACS120-7SB-TR
R 16.664
Each (In a Pack of 5)
units
- Surface Mount DPAK (TO-252) - - - 3 - - - 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS stock no. 168-6678
Mfr. Part No.ACS120-7SB-TR
R 5.468
Each (On a Reel of 2500)
units
- Surface Mount DPAK (TO-252) - - - 3 - - - 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS stock no. 168-6664
Mfr. Part No.BTA41-600BRG
R 88.901
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. 687-1007
Mfr. Part No.BTA41-600BRG
R 93.90
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. 127-0654
Mfr. Part No.BTA40-600B
R 146.43
Each
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. 102-3531
Mfr. Part No.BTA40-600B
R 116.664
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. 687-1081
Mfr. Part No.ACS108-6SN-TR
R 17.807
Each (In a Pack of 10)
units
- Surface Mount SOT-223 - - - 3+Tab - - - 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS stock no. 178-5060
Mfr. Part No.ACS108-6SN-TR
R 8.549
Each (On a Reel of 1000)
units
- Surface Mount SOT-223 - - - 3+Tab - - - 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS stock no. 714-0518
Mfr. Part No.BTA41-800BRG
R 92.98
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. 829-2711
Mfr. Part No.BTA20-600CWRG
R 34.362
Each (In a Pack of 5)
units
20A Through Hole TO-220AB 35mA 700V 210A 3 1.5V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS stock no. 168-8094
Mfr. Part No.BTA20-600CWRG
R 26.805
Each (In a Tube of 50)
units
20A Through Hole TO-220AB 35mA 700V 210A 3 1.5V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS stock no. 168-6787
Mfr. Part No.BTA41-800BRG
R 76.14
Each (In a Tube of 30)
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. 714-2603
Mfr. Part No.BTA40-800B
R 169.67
Each
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. 102-4086
Mfr. Part No.BTA40-800B
R 141.398
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. 145-8696
Mfr. Part No.ACS108-8SUN-TR
R 2.828
Each (On a Reel of 1000)
units
0.8A Surface Mount SMBflat 10mA 800V - 3 1V 800V 10mA 4.6 x 3.95 x 1.1mm 4.6mm 3.95mm 1.1mm
RS stock no. 876-5601
Mfr. Part No.ACS108-8SUN-TR
R 2.877
Each (In a Pack of 20)
units
0.8A Surface Mount SMBflat 10mA 800V - 3 1V 800V 10mA 4.6 x 3.95 x 1.1mm 4.6mm 3.95mm 1.1mm
RS stock no. 145-8613
Mfr. Part No.BTA26-600BRG
R 47.485
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. 714-0515
Mfr. Part No.BTA26-600BRG
R 63.30
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. 165-6857
Mfr. Part No.Z0103MA 1AA2
R 1.131
Each (On a Reel of 2500)
units
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. 793-1327
Mfr. Part No.BTA24-800BWRG
R 41.45
Each (In a Pack of 5)
units
25A Through Hole TO-220AB 100mA 800V 260A 3 1.3V 600V 80mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm