BTA201-800ER,112

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Thyristors - TRIACs

Thyristors are usually identified based on their type and configuration, such as thyristor-triacs. A Triac, a three-terminal device, is an integrated version of a thyristor. It is mainly used as a switch in AC loads, as its switching characteristics are superior to those with SCRs. The BTA201-800ER,112 is a Triac device.

Application Field

The BTA201-800ER,112 Triac device is mainly used for power switches and rectifiers in electronic ballasts for discharge lamps, such as gas discharge lamps, in the industrial equipments and consumer applications. It can also be used as a current measuring device, over-current protection device, and/or as a part of UART or other communication systems.

Working Principle

The BTA201-800ER,112 is a Triac device that operates on the principle of a thyristor (gate-controlled turn-on) and a rectifier (reverse-bias protection of the device). The gate of the Triac is controlled by an external signal sent to it. When the external signal is equal to or higher than the predetermined level, the Triac device type BTA201-800ER,112 gets activated, and the AC load can be switched ON. Conversely, when the external signal is lower than the predetermined level, the Triac device turns OFF and the load gets switched OFF.

Once it has been powered ON, the Triac device maintains its ON state until the AC line voltage passes through the zero volt line. This is done with the help of the latching circuitry of the Triac. This is because the latching circuitry helps the Triac to remember the gate voltage values of the device and thus the Triac does not have to be reset for each switching cycle.

Advantages over SCRs

Apart from the superior switching characteristics, Triac devices offer the advantage of being able to be used as a simple two-terminal device, whereas an SCR needs a minimum of three terminals. Since Triacs are gate-controlled devices, they can be controlled with a small signal that is sent to their gates. This simplifies the control circuit greatly, since no bulky power circuit is needed.

Also, due to their compact size and integration of thyristor and rectifier circuits, they require less space than SCRs. This makes them ideal for use in small devices. The Triac devices are also more resistant to transient surges and higher temperature, which makes them more reliable for use than SCRs.

Conclusion

The BTA201-800ER,112 is a Triac device which provides superior switching characteristics compared to SCRs. This device is mainly used as a switch in AC loads, as its switching characteristics are superior. Its latching circuitry enables it to maintain the ON state even after the AC line voltage passes through the zero volt line. Finally, it is more resistant to transient surges and higher temperature than SCRs.

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