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. 168-6661
Mfr. Part No.TPDV840RG
$10.717
Each (In a Tube of 30)
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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. 177-5178
Mfr. Part No.2N6071ATG
BrandLittelfuse
$0.82
Each (In a Tube of 50)
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4A Through Hole TO-225 10mA 200V 30A 3 2.5V 600V 30mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 330-5487
Mfr. Part No.BT137X-600D
$1.06
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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. 509-421
Mfr. Part No.BT138X-800,127
$1.232
Each (In a Pack of 5)
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12A Through Hole TO-220F 70mA 800V 105A 3 1.5V 800V 30mA 10.3 x 4.6 x 9.3mm 10.3mm 4.6mm 9.3mm
RS Stock No. 877-2605
Mfr. Part No.BTA10-800CWRG
$2.642
Each (In a Pack of 5)
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10A Through Hole TO-220AB 35mA 800V 105A 3 1.3V 800V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 145-9248
Mfr. Part No.BTB12-600BWRG
$0.675
Each (In a Tube of 30)
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12A Through Hole TO-220AB 50mA 800V 126A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 103-8144
Mfr. Part No.BT139-600
$1.128
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16A Through Hole TO-220AB 70mA 600V 170A 3 1.5V 600V 45mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 687-1035
Mfr. Part No.Z0405MF 1AA2
$1.254
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4A Through Hole TO-202 5mA 600V 21A 3 1.3V 600V 5mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS Stock No. 714-2577
Mfr. Part No.BTA08-600TWRG
$2.50
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8A Through Hole TO-220AB 5mA 800V 84A 3 1.3V 800V 10mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 102-3527
Mfr. Part No.BTA24-600CWRG
$2.846
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25A Through Hole TO-220AB 35mA 600V 260A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 687-0919
Mfr. Part No.T410-600B-TR
$1.421
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4A Surface Mount DPAK (TO-252) 10mA 600V 31A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS Stock No. 714-2678
Mfr. Part No.Z0405NF 1AA2
$1.256
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4A Through Hole TO-202 5mA 800V 21A 3 1.3V 800V 5mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS Stock No. 165-9919
Mfr. Part No.QK012LH5
BrandLittelfuse
$2.77
Each (On a Reel of 500)
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12A Through Hole TO-220AB 50mA 1000V 120A 3 1.3V 1000V 50mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS Stock No. 687-0997
Mfr. Part No.TPDV840RG
$9.85
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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. 165-7417
Mfr. Part No.T410-600B-TR
$0.593
Each (On a Reel of 2500)
units
4A Surface Mount DPAK (TO-252) 10mA 600V 31A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS Stock No. 485-6857
Mfr. Part No.BTA12-600CRG
$2.35
Each (In a Pack of 5)
units
12A Through Hole TO-220AB 50mA 600V 126A 3 1.3V 600V 25mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 177-5183
Mfr. Part No.MAC12DG
BrandLittelfuse
$1.327
Each (In a Tube of 50)
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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
RS Stock No. 103-5139
Mfr. Part No.2N6073AG
BrandLittelfuse
$0.568
Each (In a Box of 500)
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4A Through Hole TO-225 30mA 400V 30A 3 2.5V 400V 30mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 800-9184
Mfr. Part No.2N6071ATG
BrandLittelfuse
$0.812
Each (In a Pack of 25)
units
4A Through Hole TO-225 10mA 200V 30A 3 2.5V 600V 30mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
RS Stock No. 792-0728
Mfr. Part No.BTA204S-800E
$0.499
Each (On a Tape of 10)
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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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