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. 168-9604
Mfr. Part No.BT138X-600E,127
$1.298
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12A Through Hole TO-220F 25mA 600V 105A 3 1.5V 600V 30mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS Stock No. 165-7490
Mfr. Part No.T1235-600G-TR
$1.288
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12A Surface Mount D2PAK (TO-263) 35mA 600V - 3 1V - 35mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 178-1478
Mfr. Part No.BT138-800
$1.32
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RS Stock No. 166-1461
Mfr. Part No.BT134W-600
$0.447
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1A Surface Mount SOT-223 (SC-73) 70mA 600V 11A 4 1.5V 600V 15mA 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS Stock No. 687-1007
Mfr. Part No.BTA41-600BRG
$10.23
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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. 168-6844
Mfr. Part No.BTB24-800BWRG
$3.586
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25A Through Hole TO-220AB 50mA 800V 260A 3 1.3V 800V 75mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 657-1873
Mfr. Part No.BT138-800
$1.576
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12A Through Hole TO-220AB 70mA 800V 105A 3 1.5V 800V 30mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 102-3582
Mfr. Part No.BTB10-600BWRG
$1.81
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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. 687-0915
Mfr. Part No.T1235-600G-TR
$2.625
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12A Surface Mount D2PAK (TO-263) 35mA 600V 126A 3 1.3V 600V 35mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 795-8690
Mfr. Part No.Z0107MA 1AA2
$0.894
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1A Through Hole TO-92 7mA 600V 8.5A 3 1.3V - 10mA 4.7 x 3.7 x 4.4mm 4.7mm 3.7mm 4.4mm
RS Stock No. 486-3215
Mfr. Part No.T435-600T
$1.224
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4A Through Hole TO-220AB 35mA 600V 31A 3 1.3V 600V 35mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 714-0502
Mfr. Part No.BTA16-600BRG
$2.95
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16A Through Hole TO-220AB 100mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 168-6661
Mfr. Part No.TPDV840RG
$15.774
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40A Through Hole TOP3 200mA 800V 590A 3 1.5V 800V - 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 165-9897
Mfr. Part No.Q6040J7TP
BrandLittelfuse
$12.793
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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
$1.642
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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. 165-9780
Mfr. Part No.BTA204S-800E
$0.644
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4A Surface Mount DPAK (TO-252) 10mA 800V 27A 3 1.5V 800V 12mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
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Mfr. Part No.BTA08-600SWRG
$2.58
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8A Through Hole TO-220AB 10mA 800V 84A 3 1.3V 600V 15mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 330-5487
Mfr. Part No.BT137X-600D
$1.19
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8A Through Hole TO-220F 10mA 600V 71A 3 1.5V 600V 10mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS Stock No. 714-2568
Mfr. Part No.BTA08-600CRG
$2.842
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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. 805-1605
Mfr. Part No.MAC12DG
BrandLittelfuse
$1.467
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12A Through Hole TO-220AB 35mA 400V 100A 3 1.5V 800V 40mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
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