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. 127-0654
Mfr. Part No.BTA40-600B
$14.56
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. 102-3531
Mfr. Part No.BTA40-600B
$11.712
Each (In a Bag of 25)
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40A Panel Mount RD-91 100mA 600V 420A 3 1.3V 600V 80mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 877-2633
Mfr. Part No.BTB12-600CWRG
$2.04
Each (In a Pack of 10)
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12A Through Hole TO-220AB 35mA 600V 126A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 145-8698
Mfr. Part No.BTB12-600CWRG
$1.965
Each (In a Tube of 30)
units
12A Through Hole TO-220AB 35mA 600V 126A 3 1.3V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 829-4014
Mfr. Part No.BTA25-600B
$10.625
Each (In a Pack of 2)
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. 178-1386
Mfr. Part No.BTA25-600B
$10.23
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. 102-3526
Mfr. Part No.BTA16-600BWRG
$2.33
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. 486-0907
Mfr. Part No.BTA16-600BWRG
$2.954
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. 687-1029
Mfr. Part No.BTA24-600BWRG
$4.465
Each (In a Pack of 2)
units
25A Through Hole TO-220AB 50mA 600V 260A 3 1.3V 600V 75mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 168-6668
Mfr. Part No.BTA24-600BWRG
$3.54
Each (In a Tube of 50)
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25A Through Hole TO-220AB 50mA 600V 260A 3 1.3V 600V 75mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 714-2671
Mfr. Part No.Z0409MF 1AA2
$1.238
Each (In a Pack of 10)
units
4A Through Hole TO-202 10mA 600V 21A 3 1.3V 600V 10mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS Stock No. 168-7877
Mfr. Part No.BTA12-600BRG
$2.28
Each (In a Tube of 50)
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. 687-1088
Mfr. Part No.ACS102-6T1-TR
$0.791
Each (In a Pack of 10)
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- Surface Mount SOIC - - - 8 - - - 5 x 4 x 1.25mm 5mm 4mm 1.25mm
RS Stock No. 810-7332
Mfr. Part No.BTA12-600BRG
$2.456
Each (In a Pack of 10)
units
12A Through Hole TO-220AB 100 mA, 50 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. 145-9437
Mfr. Part No.Z0409MF 1AA2
$0.841
Each (In a Bag of 250)
units
4A Through Hole TO-202 10mA 600V 21A 3 1.3V 600V 10mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS Stock No. 165-7419
Mfr. Part No.ACS102-6T1-TR
$0.286
Each (On a Reel of 2500)
units
- Surface Mount SOIC - - - 8 - - - 5 x 4 x 1.25mm 5mm 4mm 1.25mm
RS Stock No. 829-2715
Mfr. Part No.BTA10-600CRG
$2.22
Each (In a Pack of 10)
units
10A Through Hole TO-220AB 50mA 800V 105A 3 1.3V 600V 25mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 110-6576
Mfr. Part No.ACST310-8FP
$1.17
Each (In a Pack of 10)
units
3A Through Hole TO-220ABFP 10mA 800V 21A 3 1.1V 800V 20mA 10.4 x 4.6 x 16.4mm 10.4mm 4.6mm 16.4mm
RS Stock No. 102-4082
Mfr. Part No.BTA12-700BRG
$2.56
Each (In a Tube of 50)
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12A Through Hole TO-220AB 100mA 700V 125A 3 1.5V 700V 50mA - - - -
RS Stock No. 486-3215
Mfr. Part No.T435-600T
$1.224
Each (In a Pack of 5)
units
4A Through Hole TO-220AB 35mA 600V 31A 3 1.3V 600V 35mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm