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    TRIACs

    A TRIAC (triode for alternating current, also known as bidirectional triode thyristor or a bilateral triode thyristor) is a silicon semiconductor component with three terminals or legs that allow current to flow in either direction when triggered. TRIACs are a subset of thyristors Thyristor guide and are similar to SCRs (silicon controlled rectifiers). However, unlike SCRs and other thyristors, which are unidirectional, the TRIAC is able to control current over both halves of the sine wave, making TRIACs bidirectional. A TRIAC is a 4-layer silicon 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 of electronics applications and circuits.RS have a curated range of TRIACs from a multitude of trusted brands, including Littelfuse, STMicroelectronics, WeEn Semiconductors Co., and many more.

    How does a TRIAC work?

    In basic terms, a TRIAC is a low-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, and TRIACs can be triggered by either negative or positive voltages, whereas SCRs require a positive voltage. Once the gate current is triggered, a TRIAC will continue to conduct even if the supply to the gate is removed.

    On a TRIAC symbol, there are three terminals. These terminals are:

    • MT1 Anode 1 (Main Terminal 1)
    • MT2 Anode 2 (Main Terminal 2)
    • Gate Terminal

    What are TRIACs used for?

    TRIACs are widely used for switching and power control of AC systems. TRIACS are particularly useful in applications such as lighting dimmer switches, 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

    667 Products showing for TRIACs

    WeEn Semiconductors Co., Ltd
    0.6A
    Through Hole
    TO-92
    7mA
    600V
    8.8A
    3
    2V
    600V
    10mA
    4.2 x 4.8 x 5.2mm
    4.2mm
    4.8mm
    5.2mm
    STMicroelectronics
    20A
    Through Hole
    TO-220AB
    35mA
    800V
    -
    3
    1.3V
    -
    -
    -
    -
    -
    -
    STMicroelectronics
    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
    Littelfuse
    4A
    Through Hole
    TO-225
    10mA
    600V
    30A
    3
    2.5V
    600V
    15mA
    7.74 x 2.66 x 11.04mm
    7.74mm
    2.66mm
    11.04mm
    WeEn Semiconductors Co., Ltd
    0.6A
    Through Hole
    SPT
    7mA
    400V
    8.8A
    3
    2V
    400V
    10mA
    4.8 x 4.2 x 5.2mm
    4.8mm
    4.2mm
    5.2mm
    WeEn Semiconductors Co., Ltd
    0.6A
    Through Hole
    TO-92
    7mA
    600V
    8.8A
    3
    2V
    600V
    10mA
    4.2 x 4.8 x 5.2mm
    4.2mm
    4.8mm
    5.2mm
    STMicroelectronics
    40A
    Panel Mount
    RD-91
    100mA
    600V
    420A
    3
    1.3V
    600V
    80mA
    40 x 27 x 14mm
    40mm
    27mm
    14mm
    WeEn Semiconductors Co., Ltd
    16A
    Through Hole
    TO-220AB
    70mA
    600V
    170A
    3
    1.5V
    600V
    45mA
    10.3 x 4.7 x 9.4mm
    10.3mm
    4.7mm
    9.4mm
    STMicroelectronics
    40A
    Panel Mount
    RD-91
    100mA
    800V
    420A
    3
    1.3V
    800V
    80mA
    40 x 27 x 14mm
    40mm
    27mm
    14mm
    WeEn Semiconductors Co., Ltd
    4A
    Through Hole
    TO-220AB
    10mA
    600V
    27A
    3
    1.5V
    600V
    10mA
    10.3 x 4.7 x 9.4mm
    10.3mm
    4.7mm
    9.4mm
    STMicroelectronics
    0.8A
    Through Hole
    TO-92
    7mA
    600V
    9.5A
    3
    1.3V
    600V
    5mA
    4.7 x 3.7 x 4.4mm
    4.7mm
    3.7mm
    4.4mm
    STMicroelectronics
    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
    STMicroelectronics
    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
    WeEn Semiconductors Co., Ltd
    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
    STMicroelectronics
    30A
    Surface Mount
    D2PAK
    35mA
    600V
    284A
    2 + Tab
    1V
    -
    75mA
    10.28 x 9.35 x 4.6mm
    10.28mm
    9.35mm
    4.6mm
    STMicroelectronics
    25A
    Through Hole
    TOP3
    100mA
    600V
    260A
    3
    1.3V
    600V
    80mA
    15.5 x 4.6 x 12.85mm
    15.5mm
    4.6mm
    12.85mm
    Littelfuse
    15A
    Through Hole
    TO-220AB
    50mA
    600V
    200A
    3
    2V
    -
    70mA
    10.67 x 4.78 x 15.75mm
    10.67mm
    4.78mm
    15.75mm
    STMicroelectronics
    25A
    Panel Mount
    RD-91
    100mA
    800V
    260A
    3
    1.3V
    600V
    80mA
    40 x 27 x 14mm
    40mm
    27mm
    14mm
    STMicroelectronics
    16A
    Through Hole
    TO-220AB
    50mA
    800V
    168A
    3
    1.3V
    800V
    50mA
    10.4 x 4.6 x 9.3mm
    10.4mm
    4.6mm
    9.3mm
    STMicroelectronics
    40A
    Through Hole
    TOP3
    200mA
    1200V
    590A
    3
    1.5V
    1200V
    -
    15.5 x 4.6 x 12.85mm
    15.5mm
    4.6mm
    12.85mm
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