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. 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. 714-2603
Mfr. Part No.BTA40-800B
HK$70.88
Each
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. 687-0990
Mfr. Part No.TPDV1225RG
HK$76.63
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. 146-0829
Mfr. Part No.BT134-600E,127
HK$2.608
Each (In a Tube of 50)
units
4A Through Hole SIP 25mA 600V 4A 3 1.5V 600V 15mA 7.8 x 2.8 x 11.1mm 7.8mm 2.8mm 11.1mm
RS Stock No. 145-8700
Mfr. Part No.BTB16-800BWRG
HK$9.247
Each (In a Tube of 50)
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. 727-1120
Mfr. Part No.BT136-600E,127
HK$3.738
Each (In a Pack of 10)
units
4A Through Hole TO-220AB 25mA 600V 27A 3 1.5V 600V 15mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 168-8107
Mfr. Part No.BTA06-600BWRG
HK$4.686
Each (In a Tube of 50)
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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. 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
RS Stock No. 687-0937
Mfr. Part No.T405Q-600B-TR
HK$5.695
Each (In a Pack of 10)
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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. 177-5199
Mfr. Part No.2N6073BG
BrandLittelfuse
HK$3.71
Each (In a Box of 500)
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4A Through Hole TO-225 20mA 400V 30A 3 2.5V 400V 30mA 7.74 x 2.66 x 11.04mm 7.74mm 2.66mm 11.04mm
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. 486-0907
Mfr. Part No.BTA16-600BWRG
HK$12.872
Each (In a Pack of 5)
units
16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 168-9600
Mfr. Part No.BTA212-600B,127
HK$5.055
Each (In a Tube of 50)
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12A Through Hole TO-220AB 50mA 600V 105A 3 1.5V 600V 60mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 657-1873
Mfr. Part No.BT138-800
HK$7.87
Each (In a Pack of 5)
units
12A Through Hole TO-220AB 70mA 800V 105A 3 1.5V 800V 30mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 102-3526
Mfr. Part No.BTA16-600BWRG
HK$9.081
Each (In a Tube of 50)
units
16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 816-7820
Mfr. Part No.BT139-800E
HK$5.156
Each (In a Pack of 10)
units
20A Through Hole TO-220AB 25mA 800V 170A 3 1V 800V 45mA 10.3 x 4.7 x 16mm 10.3mm 4.7mm 16mm
RS Stock No. 145-8699
Mfr. Part No.BTB16-600BRG
HK$9.326
Each (In a Tube of 30)
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. 178-5037
Mfr. Part No.BT134-600
HK$2.57
Each (In a Tube of 120)
units
- - - - - - - - - - - - - -
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. 800-9715
Mfr. Part No.BTA12-600BW3G
BrandLittelfuse
HK$17.235
Each (In a Pack of 10)
units
12A Through Hole TO-220 50mA 600V 105A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm