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. 486-0957
Mfr. Part No.BTB04-600SL
TWD31.80
Each (In a Pack of 5)
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. 168-6190
Mfr. Part No.BTB04-600SL
TWD26.20
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. 102-3526
Mfr. Part No.BTA16-600BWRG
TWD49.20
Each (In a Tube of 50)
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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. 102-3532
Mfr. Part No.BTA40-700B
TWD280.70
Each (In a Bag of 25)
units
40A Panel Mount RD-91 100mA 700V 315A 3 1.5V 700V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 486-0907
Mfr. Part No.BTA16-600BWRG
TWD58.20
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. 169-3287
Mfr. Part No.BTA40-700B
TWD326.00
Each
units
40A Panel Mount RD-91 100mA 700V 315A 3 1.5V 700V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 484-2741
Mfr. Part No.BT136-600D,127
TWD21.00
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. 168-6669
Mfr. Part No.T810-600B
TWD42.90
Each (In a Tube of 75)
units
8A Surface Mount DPAK (TO-252) 10mA 600V 84A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS Stock No. 166-1580
Mfr. Part No.BT136S-800
TWD12.50
Each (On a Reel of 2500)
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4A Surface Mount DPAK (TO-252) 70mA 800V 27A 3 1.5V 800V 15mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 687-1031
Mfr. Part No.T810-600B
TWD50.60
Each (In a Pack of 5)
units
8A Surface Mount DPAK (TO-252) 10mA 600V 84A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS Stock No. 168-6837
Mfr. Part No.BTA06-600CRG
TWD41.90
Each (In a Tube of 50)
units
6A Through Hole TO-220AB 25mA 800V 63A 3 1.3V 800V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 714-2558
Mfr. Part No.BTA06-600CRG
TWD48.80
Each (In a Pack of 5)
units
6A Through Hole TO-220AB 25mA 800V 63A 3 1.3V 800V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 508-816
Mfr. Part No.BT136S-800
TWD9.70
Each (In a Pack of 10)
units
4A Surface Mount DPAK (TO-252) 70mA 800V 27A 3 1.5V 800V 15mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 509-504
Mfr. Part No.BT136X-600,127
TWD17.30
Each (In a Pack of 10)
units
4A Through Hole TO-220F 70mA 600V 27A 3 1.5V 600V 15mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS Stock No. 862-4926
Mfr. Part No.MAC15A8G
BrandLittelfuse
TWD48.20
Each (In a Pack of 10)
units
15A Through Hole TO-220AB 75mA 600V 150A 3 2.5V 600V 40mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 165-9777
Mfr. Part No.BT137S-600D
TWD13.40
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
RS Stock No. 146-0398
Mfr. Part No.BT139X-600F
TWD26.00
Each (On a Reel of 50)
units
16A Through Hole TO-220F 70mA 600V 170A 3 1.5V 600V 45mA 10.3 x 4.6 x 15.8mm 10.3mm 4.6mm 15.8 (With Tab)mm
RS Stock No. 166-1234
Mfr. Part No.BT131-800
TWD3.90
Each (On a Reel of 5000)
units
1A Through Hole SPT 7mA 800V 13.8A 3 1.5V 800V 5mA 4.8 x 4.2 x 5.2mm 4.8mm 4.2mm 5.2mm
RS Stock No. 145-9207
Mfr. Part No.BTA08-600CRG
TWD47.50
Each (In a Tube of 50)
units
8A Through Hole TO-220AB 50mA - - 3 1.3V 600V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 165-5580
Mfr. Part No.T835-600B-TR
TWD18.70
Each (On a Reel of 2500)
units
8A Surface Mount DPAK (TO-252) 35mA 600V 80A 3 1.3V 600V 35mA 6.73 x 7.49 x 2.4mm 6.73mm 7.49mm 2.4mm