TOPT16-800C0,127

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Thyristors - TRIACs

TRIACs are a type of thyristor, which is a three-terminal power semiconductor switch normally used in AC applications. They are commonly used to control the amount of current being sent to a certain device, such as a motor. The acronym TRIAC stands for Triode for Alternating Current. These thyristors are triggered into conduction mode using a positive or negative gate signal. The device is available in various current ratings, and the most common one is TOPT16-800C0,127.

Application Field

The TOPT16-800C0,127 is a popular TRIAC thyristor device, and due to its relatively high current rating and low package size it is suitable for a wide range of applications. In AC single-phase and three-phase circuits, the device is commonly used to control the amount of current being sent to a motor or any other devices. Additionally, the device can be used in power controllers, dimmers, lighting fixtures, and home appliances.

Working Principle

TRIACs, including the TOPT16-800C0,127 device, work on the principle of unipolar current control in AC circuits. Unlike BJTs, which are field-effect transistors that are controlled by the current flow through the base terminal, TRIACs are controlled by the gate terminal. Thus, in the simplest terms, when a gate voltage is applied to the TRIAC gate terminal, the gate-to-cathode path is conductive, and the TRIAC is switched ON as a result.

In an AC circuit, the TRIAC, and specifically the TOPT16-800C0,127, is triggered into conduction mode when a positive or negative voltage is applied to the gate terminal. This happens for both half cycles of the waveform, and the current will keep flowing through the device until the current drops below the holding current of the device, which is around 8 mA.

When the triggering voltage is removed, the device is switched OFF as the internal resistance increases significantly. Depending on the current rating, the device must be mounted to a heat sink so that it doesn’t overheat when in conduction mode.

Conclusion

The TOPT16-800C0,127 is a popular TRIAC thyristor device used to control the current flow in AC applications. It is commonly used in power controllers, dimmers, lighting fixtures, and home appliances. The device is triggered into conduction mode by applying a positive or negative voltage to the gate terminal, and it stays in conduction mode until the current drops below a certain level.

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