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. 484-2741
Mfr. Part No.BT136-600D,127
PHP32.13
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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. 168-9601
Mfr. Part No.BTA140-800,127
PHP62.383
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25A Through Hole TO-220AB 70mA 800V 209A 3 1.5V 800V 30mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 198-4319
Mfr. Part No.BTA140-800,127
PHP73.22
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25A Through Hole TO-220AB 70mA 800V 209A 3 1.5V 800V 30mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 816-7827
Mfr. Part No.BTA225-800B
PHP58.052
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25A Through Hole TO-220AB 50mA 800V 209A 3 1.5V 800V 60mA 10.3 x 4.5 x 15.8mm 10.3mm 4.5mm 15.8mm
RS Stock No. 165-8513
Mfr. Part No.BTA225-800B
PHP49.711
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25A Through Hole TO-220AB 50mA 800V 209A 3 1.5V 800V 60mA 10.3 x 4.5 x 15.8mm 10.3mm 4.5mm 15.8mm
RS Stock No. 146-0359
Mfr. Part No.BT134-600D,127
PHP23.97
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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. 727-1111
Mfr. Part No.BT134-600D,127
PHP24.898
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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. 168-6664
Mfr. Part No.BTA41-600BRG
PHP253.674
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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. 687-1007
Mfr. Part No.BTA41-600BRG
PHP310.59
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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. 714-2564
Mfr. Part No.BTA08-600BRG
PHP70.636
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8A Through Hole TO-220AB 100mA 800V 84A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 145-8613
Mfr. Part No.BTA26-600BRG
PHP172.727
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25A Through Hole TOP3 100mA 600V 260A 3 1.3V 600V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 714-0515
Mfr. Part No.BTA26-600BRG
PHP203.14
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25A Through Hole TOP3 100mA 600V 260A 3 1.3V 600V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 829-0642
Mfr. Part No.BTA16-600SWRG
PHP94.35
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16A Through Hole TO-220AB 10mA 800V 168A 3 1.3V 600V 15mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 145-9666
Mfr. Part No.BTA16-600SWRG
PHP83.008
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16A Through Hole TO-220AB 10mA 800V 168A 3 1.3V 600V 15mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 168-6667
Mfr. Part No.T2035H-6I
PHP72.828
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20A Through Hole TO-220AB 35mA 600V 210A 3 1V 600V 35mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 168-6787
Mfr. Part No.BTA41-800BRG
PHP281.00
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40A Through Hole TOP3 100mA 800V 420A 3 1.3V 800V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 165-5057
Mfr. Part No.FT0408MD TR
PHP15.224
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4A Surface Mount DPAK (TO-252) 10mA 600V - 3 1.3V 600V 15mA 6.73 x 6.22 x 2.39mm 6.73mm 6.22mm 2.39mm
RS Stock No. 178-5060
Mfr. Part No.ACS108-6SN-TR
PHP23.409
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- Surface Mount SOT-223 - - - 3+Tab - - - 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS Stock No. 123-1473
Mfr. Part No.FT0408MD TR
PHP17.68
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4A Surface Mount DPAK (TO-252) 10mA 600V - 3 1.3V 600V 15mA 6.73 x 6.22 x 2.39mm 6.73mm 6.22mm 2.39mm
RS Stock No. 714-0518
Mfr. Part No.BTA41-800BRG
PHP331.01
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40A Through Hole TOP3 100mA 800V 420A 3 1.3V 800V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
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