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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Omschrijving Prijs 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-stocknr. 484-2763
FabrikantnummerBT137-600,127
€ 0,584
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8A Through Hole TO-220AB 70mA 600V 71A 3 1.5V 600V 20mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
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€ 0,751
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4A Through Hole TO-202 5mA 800V 21A 3 1.3V 800V 5mA 10.1 x 4.5 x 7.3mm 10.1mm 4.5mm 7.3mm
RS-stocknr. 714-0518
FabrikantnummerBTA41-800BRG
€ 5,73
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40A Through Hole TOP3 100mA 800V 420A 3 1.3V 800V 80mA 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
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€ 0,275
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RS-stocknr. 102-3527
FabrikantnummerBTA24-600CWRG
€ 1,914
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25A Through Hole TO-220AB 35mA 600V 260A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS-stocknr. 165-7419
FabrikantnummerACS102-6T1-TR
€ 0,165
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- Surface Mount SOIC - - - 8 - - - 5 x 4 x 1.25mm 5mm 4mm 1.25mm
RS-stocknr. 145-8613
FabrikantnummerBTA26-600BRG
€ 3,086
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€ 0,894
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€ 0,756
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4A Through Hole TO-220AB 10mA 600V 31A 3 1.3V 600V 15mA 10.4 x 4.6 x 9.15mm 10.4mm 4.6mm 9.15mm
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€ 6,622
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40A Through Hole TOP3 100mA 600V 420A 3 1.3V 600V 80mA 15.5 x 4.6 x 21.1mm 15.5mm 4.6mm 21.1mm
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€ 0,536
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€ 0,25
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1A Surface Mount SOT-223 (SC-73) 70mA 600V 11A 4 1.5V 600V 15mA 6.7 x 3.7 x 1.7mm 6.7mm 3.7mm 1.7mm
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FabrikantnummerT810-600B
€ 1,286
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8A Surface Mount DPAK (TO-252) 10mA 600V 84A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
RS-stocknr. 145-9206
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€ 0,575
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8A Through Hole TO-220AB 100mA 800V 84A 3 1.3V 800V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
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€ 1,102
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8A Surface Mount DPAK (TO-252) 10mA 600V 84A 3 1.3V 600V 15mA 6.6 x 6.2 x 2.4mm 6.6mm 6.2mm 2.4mm
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