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. 103-5139
Mfr. Part No.2N6073AG
BrandLittelfuse
£0.258
Each (In a Box of 500)
Units
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. 792-0709
Mfr. Part No.BT137S-600D,118
£0.328
Each (In a Pack of 10)
Units
8A Surface Mount DPAK (TO-252) 5mA 600V 71A 3 1V 600V 10mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 165-9777
Mfr. Part No.BT137S-600D,118
£0.298
Each (On a Reel of 2500)
Units
8A Surface Mount DPAK (TO-252) 5mA 600V 71A 3 1V 600V 10mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 124-2292
Mfr. Part No.BT136-600D,127
£0.369
Each (In a Tube of 50)
Units
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. 178-1432
Mfr. Part No.BTA140-600,127
£0.899
Each (In a Tube of 50)
Units
- - - - - - - - - - - - - -
RS Stock No. 198-4303
Mfr. Part No.BTA140-600,127
£1.06
Each
Units
25A Through Hole TO-220AB 70mA 600V 209A 3 1.5V 600V 60mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 829-0481
Mfr. Part No.BTB24-600BRG
£1.734
Each (In a Pack of 5)
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25A Through Hole TO-220AB 100mA 800V 260A 3 1.3V 600V 80mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 171-0138
Mfr. Part No.MAC4DLMT4G
BrandLittelfuse
£0.437
Each (On a Reel of 2500)
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4A Surface Mount DPAK (TO-252) 5mA 600V 40A 3 1.3V 600V 15mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 145-9251
Mfr. Part No.BTB24-600BRG
£1.469
Each (In a Tube of 50)
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25A Through Hole TO-220AB 100mA 800V 260A 3 1.3V 600V 80mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 807-9934
Mfr. Part No.MAC4DLMT4G
BrandLittelfuse
£0.449
Each (In a Pack of 50)
Units
4A Surface Mount DPAK (TO-252) 5mA 600V 40A 3 1.3V 600V 15mA 6.73 x 6.22 x 2.38mm 6.73mm 6.22mm 2.38mm
RS Stock No. 168-6660
Mfr. Part No.TPDV1225RG
£6.579
Each (In a Tube of 30)
Units
25A Through Hole TOP3 150mA 1200V 390A 3 1.5V 1200V - 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 168-8899
Mfr. Part No.T2050H-6T
£1.087
Each (In a Tube of 50)
Units
20A Through Hole TO-220AB 50mA 600V 210A 3 1V 600V 75mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 877-3024
Mfr. Part No.T2050H-6T
£1.282
Each (In a Pack of 5)
Units
20A Through Hole TO-220AB 50mA 600V 210A 3 1V 600V 75mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 687-0990
Mfr. Part No.TPDV1225RG
£7.65
Each
Units
25A Through Hole TOP3 150mA 1200V 390A 3 1.5V 1200V - 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 168-9624
Mfr. Part No.BT136-600,127
£0.369
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. 103-1576
Mfr. Part No.BTA26-800CWRG
£3.07
Each (In a Tube of 30)
Units
25A Through Hole TOP3 35mA 800V 260A 3 1.3V 800V 50mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 484-2735
Mfr. Part No.BT136-600,127
£0.448
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. 687-1047
Mfr. Part No.BTA16-600CWRG
£1.36
Each (In a Pack of 5)
Units
16A Through Hole TO-220AB 35mA 600V 168A 3 1.3V 600V 35mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 714-2609
Mfr. Part No.BTA26-800CWRG
£3.61
Each
Units
25A Through Hole TOP3 35mA 800V 260A 3 1.3V 800V 50mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 178-1484
Mfr. Part No.BTA16-600CWRG
£1.155
Each (In a Tube of 50)
Units
16A Through Hole TO-220AB 35mA 600V 168A 3 1.3V 600V 35mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
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