BTA208X-600E,127

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Thyristors - TRIACs

TRIAC/thyristors are a group of three layer, three terminal semi-conductor devices used for controlling current and power. The BTA208X-600E,127 is a thyristor of the TRIAC family that is suitable for both switch and AC load control applications. This article will explore the field of applications and working principles that the BTA208X-600E,127 is utilized in.

Applications for BTA208X-600E,127

Owing to their ability to handle higher currents, TRIACs/thyristors are often used in AC load control applications such as dimmers, phase-control circuits and motor control. The application of the BTA208X-600E,127 can be tailored towards AC phase-control applications, as it is designed to handle high currents while withstanding transients effectively.

For speed regulation applications, the BTA208X-600E,127 comes with trigger current and a minimum holding current for its triggering pin, which allows for consistent and reliable operation. As a result, the motor’s speed can be controlled precisely.

Due to its high thermal dissipation rating and low holding current, BTA208X-600E,127 can also be applied to switch applications where it allows for fast and aggressive triggering, which is required by certain applications such as HVDC links.

Working Principles of BTA208X-600E,127

Unlike BJT/MOSFET transistors, thyristors/TRIACs operates in both conduction and blocking states. With the BTA208X-600E,127, the gate current must exceed a certain threshold for the device to be switched on. The device then passes the current that flows through it when the polarity of current is deemed favourable.

When the current decreases to a certain minimum value known as the holding current, the switch will not turn off. With BTA208X-600E,127, the holding current is optimized for AC load control applications.

Upon applying a negative gate pulse (negative cycle of AC mains) after the positive pulse, the device is switched off. This negative gate pulse must exceed a certain minimum current and must be shorter than a certain minimum duration.

The BTA208X-600E,127 also caters to switch applications that require aggressive triggering. This can be achieved by bypassing the regular triac driver circuit and driving the gate directly. The gate Pin of the BTA208X-600E,127 must be configured in Flyback/Body-dioed mode before connecting to the mains. The BTA208X-600E,127 can also be configured in trigger reactive/Series-dioed mode.

Conclusion

The BTA208X-600E,127 is a versatile, high-current TRIAC/thyristor for a number of applications such as AC load control, switch applications and motor speed regulation. A variety of different triggering modes can be utilized for these applications, enabling the user to switch and control devices more precisely than with BJT/MOSFET transistors.

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