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. 168-6648
Mfr. Part No.T1235-800G-TR
HK$5.738
Each (On a Reel of 1000)
units
12A Surface Mount D2PAK (TO-263) 35mA 800V 126A 3 1.3V 800V 35mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 165-7592
Mfr. Part No.BTB16-800CWRG
HK$4.746
Each (In a Tube of 50)
units
16A Through Hole TO-220AB 35mA 800V 168A 3 1.3V 800V 35mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 178-1386
Mfr. Part No.BTA25-600B
HK$51.02
Each (In a Bag of 25)
units
25A Panel Mount RD-91 100mA 800V 260A 3 1.3V 600V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 829-0618
Mfr. Part No.T2035H-6T
HK$23.122
Each (In a Pack of 5)
units
20A Through Hole TO-220AB 35mA 600V 210A 3 1V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 124-3657
Mfr. Part No.BCR3AM-14B#B00
HK$9.336
Each (In a Pack of 5)
units
3A Through Hole TO-92 30mA - 30A 3 1.5V 800V - 5 x 3.6 x 5mm 5mm 3.6mm 5mm
RS Stock No. 165-9917
Mfr. Part No.Q6030LH5
BrandLittelfuse
HK$20.262
Each (On a Reel of 500)
units
30A Through Hole TO-220AB 50mA 600V 350A 3 2.75V 600V 75mA 10.67 x 4.78 x 15.75mm 10.67mm 4.78mm 15.75mm
RS Stock No. 877-2643
Mfr. Part No.BTB24-800CWRG
HK$14.988
Each (In a Pack of 5)
units
25A Through Hole TO-220AB 35mA 800V 260A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 177-5182
Mfr. Part No.BTB16-800CW3G
BrandLittelfuse
HK$8.068
Each (In a Tube of 50)
units
16A Through Hole TO-220 35mA 800V 170A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 145-9666
Mfr. Part No.BTA16-600SWRG
HK$9.882
Each (In a Tube of 50)
units
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. 486-1023
Mfr. Part No.BTB12-600B
HK$8.95
Each (In a Pack of 5)
units
12A Through Hole TO-220AB 100mA 600V 126A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 714-2615
Mfr. Part No.BTB06-600CWRG
HK$7.158
Each (In a Pack of 5)
units
6A Through Hole TO-220AB 35mA 600V 63A 3 1.3V 600V 35mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
RS Stock No. 102-3531
Mfr. Part No.BTA40-600B
HK$54.629
Each (In a Bag of 25)
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. 714-2653
Mfr. Part No.T410-600B
HK$2.573
Each (In a Pack of 10)
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
New
RS Stock No. 188-8299
Mfr. Part No.T3050H-6T
HK$24.603
Each (In a Tube of 50)
units
30A Through Hole TO-220AB - - 284A 3 - 600V 75mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 178-1484
Mfr. Part No.BTA16-600CWRG
HK$8.224
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
RS Stock No. 123-1475
Mfr. Part No.FT0808MD TR
HK$3.422
Each (In a Pack of 20)
units
8A Surface Mount DPAK (TO-252) 10mA 600V - 3 1.3V 600V 10mA 6.73 x 6.22 x 2.39mm 6.73mm 6.22mm 2.39mm
RS Stock No. 178-1385
Mfr. Part No.BTA25-800BW
HK$51.00
Each (In a Bag of 25)
units
25A Through Hole RD-91 50mA 800V 260A 3 1.3V 600V 75mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
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. 829-3948
Mfr. Part No.ACS108-6SA
HK$7.335
Each (In a Pack of 10)
units
- Through Hole TO-92 - - - 3 - - - 4.7 x 4.4 x 3.7mm 4.7mm 4.4mm 3.7mm
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
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