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. 805-1609
Mfr. Part No.MAC12HCMG
BrandLittelfuse
HK$9.782
Each (In a Pack of 10)
units
12A Through Hole TO-220AB 50mA 600V 100A 3 1.5V 800V 60mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 878-3908
Mfr. Part No.Q4008R4
BrandLittelfuse
HK$7.32
Each (In a Pack of 500)
units
8A Through Hole TO-220 25mA 400V 100A 3 1.3V - 50mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS Stock No. 177-5184
Mfr. Part No.MAC12HCMG
BrandLittelfuse
HK$9.361
Each (In a Tube of 50)
units
12A Through Hole TO-220AB 50mA 600V 100A 3 1.5V 800V 60mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 168-8917
Mfr. Part No.BTA06-600CWRG
HK$7.318
Each (In a Tube of 50)
units
6A Through Hole TO-220AB 35mA 600V 60A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 829-0343
Mfr. Part No.BTA08-600BWRG
HK$11.176
Each (In a Pack of 5)
units
8A Through Hole TO-220AB 50mA 800V 84A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 509-380
Mfr. Part No.BT134-800
HK$3.51
Each (In a Pack of 10)
units
4A Through Hole SIP 70mA 800V 27A 3 1.5V 800V 15mA 7.8 x 2.8 x 11.1mm 7.8mm 2.8mm 11.1mm
RS Stock No. 877-2624
Mfr. Part No.BTA26-600BWRG
HK$36.164
Each (In a Pack of 5)
units
25A Through Hole TOP3 50mA 600V 260A 3 1.3V 600V 75mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm
RS Stock No. 484-2741
Mfr. Part No.BT136-600D,127
HK$4.336
Each (In a Pack of 5)
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. 714-2592
Mfr. Part No.BTA16-800BRG
HK$14.225
Each (In a Pack of 2)
units
16A Through Hole TO-220AB 100mA 800V 168A 3 1.3V 800V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 727-1111
Mfr. Part No.BT134-600D,127
HK$3.233
Each (In a Pack of 10)
units
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. 877-2646
Mfr. Part No.BTB16-600BRG
HK$9.812
Each (In a Pack of 10)
units
16A Through Hole TO-220AB 100mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 829-3806
Mfr. Part No.BTA06-600BWRG
HK$8.85
Each (In a Pack of 10)
units
6A Through Hole TO-220AB 50mA 800V 63A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 687-0937
Mfr. Part No.T405Q-600B-TR
HK$5.695
Each (In a Pack of 10)
units
4A Surface Mount DPAK (TO-252) 10mA 600V 38A 3 1.5V 600V 10mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS Stock No. 102-4086
Mfr. Part No.BTA40-800B
HK$61.72
Each (In a Bag of 25)
units
40A Panel Mount RD-91 100mA 800V 420A 3 1.3V 800V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 284-905
Mfr. Part No.BT134-600
HK$4.21
Each
units
25A Through Hole SOT-82 70mA 600V 27A 3 1.5V 600V 15mA 7.8 x 2.8 x 11.1mm 7.8mm 2.8mm 11.1mm
RS Stock No. 877-2649
Mfr. Part No.BTB16-800BWRG
HK$9.996
Each (In a Pack of 5)
units
16A Through Hole TO-220AB 50mA 800V 168A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 262-494
Mfr. Part No.BT139-600
HK$7.42
Each
units
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. 145-9251
Mfr. Part No.BTB24-600BRG
HK$13.171
Each (In a Tube of 50)
units
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. 178-5154
Mfr. Part No.T405Q-600B-TR
HK$3.18
Each (On a Reel of 2500)
units
4A Surface Mount DPAK (TO-252) 10mA 600V 38A 3 1.5V 600V 10mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS Stock No. 829-0481
Mfr. Part No.BTB24-600BRG
HK$15.818
Each (In a Pack of 5)
units
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
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