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. 829-0633
Mfr. Part No.BTA25-600BW
$11.13
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25A Panel Mount RD-91 50mA 800V 260A 3 1.3V 600V 75mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 687-0934
Mfr. Part No.T810-600G-TR
$1.836
Each (In a Pack of 5)
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8A Surface Mount D2PAK (TO-263) 10mA 600V 84A 3 1.3V 600V 15mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 180-7056
Mfr. Part No.VO3062
BrandVishay
$1.232
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- Through Hole DIP 10mA 6V 1 (Non-Reptitive)A 6 22V 600V - 9 x 6.4 x 3.5mm 9mm 6.4mm 3.5mm
RS Stock No. 792-0695
Mfr. Part No.BT134W-600D
$0.485
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1A Surface Mount SOT-223 10mA 600V 11A 3+Tab 0.4V 600V 10mA 6.7 x 3.7 x 1.8mm 6.7mm 3.7mm 1.8mm
RS Stock No. 168-8079
Mfr. Part No.T2550-12G
$6.093
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25A Surface Mount D2PAK (TO-263) 50mA 1200V 252A 3 1.3V 1200V 60mA 10.28 x 9.35 x 4.6mm 10.28mm 9.35mm 4.6mm
RS Stock No. 168-7888
Mfr. Part No.T1635H-6I
$2.429
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16A Through Hole TO-220AB 35mA 600V 168A 3 1V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 791-7983
Mfr. Part No.T1635T-8T
$1.634
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16A Through Hole TO-220AB 35mA 800V 126A 3 1.3V 800V 40mA 10.4 x 4.6 x 15.75mm 10.4mm 4.6mm 15.75mm
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