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Thyristors - TRIACs

A TRIAC (Triode for Alternating Current) is a type of thyristor that allows current flow in both directions. It is the most important type of thyristor and is used in various applications including power switching, dimming and motor control. The TIC263M-S is a TRIAC produced by STMicroelectronics, and is an ultra-sensitive gate, bidirectional, general purpose, triac with a specific gate trigger current. It is commonly used for AC switching, lighting control, mains control and low power AC switching.

Applications for the TIC263M-S

The TIC263M-S is a general purpose TRIAC and can be used in a variety of applications. These applications include controlling the speed of small electric motors, relays, light dimmers, fluorescent lighting ballasts and home appliance controls. Low power AC switching is also possible, such as controlling the power of USB devices, laptop computer power supplies, consumer audio and home theatre systems, LED lighting and LED multi-colour lighting.

Working Principle of the TIC263M-S

The TIC263M-S is a thyristor with three ‘regions’ inside the device, namely The Anode Region, The Gate Region and The Cathode Region. The Anode Region provides the connection to the power source and the Cathode Region connects the circuit to the load. When the Gate Region is energized, electrical current can flow through the device from Anode Region to the cathode region. This is known as ‘forward conduction.’

When the Gate Region is not energized, the device will not conduct in the forward direction and electricity will be unable to pass through the device until the Gate Region is energized again. This state of operation is known as ‘reverse blocking’. When the Gate Region is energized and the anode region is connected to a negative potential, current will flow through the device in the opposite direction, known as ‘reverse conduction.’ Finally, when the Gate Region is not energized and the anode region is connected to a negative potential, no current will be able to flow through the device, known as ‘reverse blocking.’

The TIC263M-S is an ultra-sensitive gate, bidirectional, general purpose, triac with a specific gate trigger current. This means that the current needed in order to turn the device on is quite low and so the device can be used in low power switching applications as mentioned earlier.

Conclusion

The TIC263M-S is a general purpose TRIAC produced by STMicroelectronics. It can be used in a variety of applications such as controlling the speed of small electric motors, relays, and light dimmers. The device is ultra-sensitive and requires a low gate trigger current, making it suitable for low power AC switching.

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