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. 169-0641
Mfr. Part No.MAC97A6,412
$0.154
Each (In a Bag of 1000)
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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. 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. 146-0359
Mfr. Part No.BT134-600D,127
$0.782
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4A Through Hole SIP 10mA 600V 27A 3 1.5V 600V 10mA 7.8 x 2.8 x 11.1mm 7.8mm 2.8mm 11.1mm
RS Stock No. 714-2625
Mfr. Part No.BTB10-600BWRG
$2.156
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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. 168-6240
Mfr. Part No.T435-600T
$1.32
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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. 178-1497
Mfr. Part No.BTA16-600CRG
$2.72
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16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 168-7905
Mfr. Part No.T1235-600G
$2.453
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12A Surface Mount D2PAK (TO-263) 35mA 600V 3.9mA 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. 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. 811-1111
Mfr. Part No.T1235-600G
$3.00
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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. 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. 714-2631
Mfr. Part No.BTB24-800BWRG
$4.41
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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. 168-5856
Mfr. Part No.ACST310-8FP
$1.188
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3A Through Hole TO-220ABFP 10mA 800V 21A 3 1.1V 800V 20mA 10.4 x 4.6 x 16.4mm 10.4mm 4.6mm 16.4mm
RS Stock No. 714-2637
Mfr. Part No.BTB24-600CWRG
$3.952
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25A Through Hole TO-220AB 35mA 600V 260A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 727-1120
Mfr. Part No.BT136-600E,127
$0.873
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4A Through Hole TO-220AB 25mA 600V 27A 3 1.5V 600V 15mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 110-6576
Mfr. Part No.ACST310-8FP
$1.188
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3A Through Hole TO-220ABFP 10mA 800V 21A 3 1.1V 800V 20mA 10.4 x 4.6 x 16.4mm 10.4mm 4.6mm 16.4mm
RS Stock No. 714-0512
Mfr. Part No.BTB24-600BWRG
$3.83
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25A Through Hole TO-220AB 50mA 600V 260A 3 1.3V 600V 75mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 102-4082
Mfr. Part No.BTA12-700BRG
$2.607
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12A Through Hole TO-220AB 100mA 700V 125A 3 1.5V 700V 50mA - - - -
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. 177-7329
Mfr. Part No.BTA216-600B
$1.80
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16A Through Hole TO-220AB 50mA 600V 150A 3 1.5V 600V 60mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
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