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. 486-0907
Mfr. Part No.BTA16-600BWRG
kr 14,158
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. 102-3526
Mfr. Part No.BTA16-600BWRG
kr 12,058
Each (In a Tube of 50)
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. 509-415
Mfr. Part No.BT138X-600,127
kr 7,676
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. 146-0400
Mfr. Part No.BTA208X-600E,127
kr 7,832
Each (On a Reel of 50)
Units
8A Through Hole TO-220F 10mA 600V 71A 3 1.5V 600V 12mA 10.3 x 4.6 x 15.8mm 10.3mm 4.6mm 15.8 (With Tab)mm
RS Stock No. 792-0730
Mfr. Part No.BTA208X-600E,127
kr 8,614
Each (In a Pack of 10)
Units
8A Through Hole TO-220F 10mA 600V 71A 3 1.5V 600V 12mA 10.3 x 4.6 x 15.8mm 10.3mm 4.6mm 15.8 (With Tab)mm
RS Stock No. 103-5705
Mfr. Part No.BT139-800,127
kr 7,055
Each (In a Tube of 50)
Units
16A Through Hole TO-220AB 70mA 800V 170A 3 1.5V 800V 45mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 484-2814
Mfr. Part No.BT139-800,127
kr 8,076
Each (In a Pack of 5)
Units
16A Through Hole TO-220AB 70mA 800V 170A 3 1.5V 800V 45mA 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
kr 5,064
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. 168-9624
Mfr. Part No.BT136-600,127
kr 4,169
Each (In a Tube of 50)
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. 800-9727
Mfr. Part No.BTA12-800BW3G
BrandLittelfuse
kr 11,28
Each (In a Pack of 10)
Units
12A Through Hole TO-220 50mA 800V 105A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 178-1386
Mfr. Part No.BTA25-600B
kr 53,28
Each (In a Bag of 25)
Units
25A Panel Mount RD-91 100mA 800V 260A 3 1.3V 600V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 177-5198
Mfr. Part No.2N6075AG
BrandLittelfuse
kr 2,909
Each (In a Box of 500)
Units
4A Through Hole TO-225 10mA 600V 30A 3 2.5V 600V 15mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 165-7646
Mfr. Part No.Z0410MF 1AA2
kr 4,325
Each (In a Bag of 250)
Units
4A Through Hole TO-202 25mA 600V 21A 3 1.3V 600V 25mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS Stock No. 165-9897
Mfr. Part No.Q6040J7TP
BrandLittelfuse
kr 69,738
Each (In a Tube of 25)
Units
40A Through Hole TO-218X 100mA 600V 400A 3 2V 600V 120mA 16 x 4.78 x 21.21mm 16mm 4.78mm 21.21mm
RS Stock No. 484-2820
Mfr. Part No.BT139X-800,127
kr 7,836
Each (In a Pack of 5)
Units
16A Through Hole TO-220F 70mA 800V 170A 3 1.5V 800V 45mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS Stock No. 877-3028
Mfr. Part No.T2535-600G
kr 7,722
Each (In a Pack of 5)
Units
25A Surface Mount D2PAK (TO-263) 35mA 600V 260A 3 1.3V 600V 80mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 714-2625
Mfr. Part No.BTB10-600BWRG
kr 9,99
Each (In a Pack of 5)
Units
10A Through Hole TO-220AB 50mA 600V 105A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 687-0909
Mfr. Part No.T2535-600G-TR
kr 7,26
Each (In a Pack of 2)
Units
25A Surface Mount D2PAK (TO-263) 35mA 600V 260A 3 1.3V 600V 50mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 165-7489
Mfr. Part No.T2535-600G-TR
kr 7,163
Each (On a Reel of 1000)
Units
25A Surface Mount D2PAK (TO-263) 35mA 600V 260A 3 1.3V 600V 80mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 124-9963
Mfr. Part No.BTA12-600CW3G
BrandLittelfuse
kr 13,607
Each (In a Tube of 50)
Units
12A Through Hole TO-220 35mA 600V 105A 3 1.7V 800V 45mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
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