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. 165-9897
Mfr. Part No.Q6040J7TP
BrandLittelfuse
HK$55.72
Each (In a Tube of 25)
units
40A Through Hole TO-218X 100mA 600V 400A 3 2V 600V 120mA 16 x 4.78 x 21.21mm 16mm 4.78mm 21.21mm
RS Stock No. 829-2721
Mfr. Part No.T1210T-6I
HK$4.656
Each (In a Pack of 5)
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12A Through Hole TO-220AB 10mA - 95A 3 1.3V - 10mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 829-0425
Mfr. Part No.BTA12-800BWRG
HK$11.682
Each (In a Pack of 5)
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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. 920-6370
Mfr. Part No.T405-600H
HK$4.757
Each (In a Tube of 75)
units
4A Through Hole IPAK (TO-251) 5mA 600V 31A 3 1.3V 600V 10mA 6.6 x 2.4 x 6.2mm 6.6mm 2.4mm 6.2mm
RS Stock No. 330-5487
Mfr. Part No.BT137X-600D
HK$5.63
Each
units
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. 165-9919
Mfr. Part No.QK012LH5
BrandLittelfuse
HK$14.334
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. 145-9300
Mfr. Part No.BTB06-600SWRG
HK$6.397
Each (In a Tube of 30)
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6A Through Hole TO-220AB 10mA 600V 63A 3 1.3V 600V 15mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 168-8900
Mfr. Part No.T2535-600G
HK$12.553
Each (In a Tube of 50)
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25A Surface Mount D2PAK (TO-263) 35mA 600V 260A 3 1.3V 600V 80mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 124-2436
Mfr. Part No.Z0103MN,135
HK$1.00
Each (On a Reel of 4000)
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1A Surface Mount SOT-223 (SC-73) 5mA 600V 8.5A 4 1.3V 600V 7mA 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS Stock No. 123-1478
Mfr. Part No.FT0814MH TU
HK$3.67
Each (In a Pack of 20)
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8A Through Hole TO-220AB 35mA 600V - 3 1.3V 600V 35mA 10.36 x 4.67 x 15.35mm 10.36mm 4.67mm 15.35mm
RS Stock No. 800-9755
Mfr. Part No.BTB12-600BW3G
BrandLittelfuse
HK$7.191
Each (In a Pack of 10)
units
12A Through Hole TO-220 50mA 600V 120A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 178-1495
Mfr. Part No.BTA06-800BWRG
HK$6.863
Each (In a Tube of 50)
units
6A Through Hole TO-220AB 50mA 800V 63A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 127-0654
Mfr. Part No.BTA40-600B
HK$63.40
Each
units
40A Panel Mount RD-91 100mA 600V 420A 3 1.3V 600V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 808-3977
Mfr. Part No.MAC8NG
BrandLittelfuse
HK$6.38
Each (In a Pack of 20)
units
8A Through Hole TO-220AB 35mA 800V 80A 3 1.5V 800V 40mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
New
RS Stock No. 188-8307
Mfr. Part No.Z0103NN5AA4
HK$2.176
Each (On a Reel of 1000)
units
1A Surface Mount SOT-223 25mA - 8.5A 4 - 800V 7mA 6.7 x 3.7 x 1.8mm 6.7mm 3.7mm 1.8mm
New
RS Stock No. 192-4974
Mfr. Part No.T3050H-6G
HK$25.226
Each (In a Pack of 5)
units
30A Surface Mount D2PAK 50mA 600V 284A 3 1V - 75mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 714-2568
Mfr. Part No.BTA08-600CRG
HK$11.78
Each (In a Pack of 5)
units
8A Through Hole TO-220AB 50mA - - 3 1.3V 600V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 810-7332
Mfr. Part No.BTA12-600BRG
HK$9.342
Each (In a Pack of 10)
units
12A Through Hole TO-220AB 50 mA, 100 mA 600V 126A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 178-5060
Mfr. Part No.ACS108-6SN-TR
HK$4.721
Each (On a Reel of 1000)
units
- Surface Mount SOT-223 - - - 3+Tab - - - 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
RS Stock No. 878-1656
Mfr. Part No.Q6008L5
BrandLittelfuse
HK$8.383
Each (In a Pack of 500)
units
8A Through Hole TO-220 50mA 600V 100A 3 1.3V - 50mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm