TM BTE. Sensitive Gate Triacs. Passivated, sensitive gate triacs in a plastic envelope, intended for use in general purpose. T2 T1. Simplified outline.
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Note: Complete Technical Details can be found in the datasheet present at the end of this page. The gate threshold voltage of the BT is also very less so can be driven by digital circuits. So if you looking to switch of control dim, speed control an AC load which consumes less than 6A with a digital device like microcontroller or microprocessor then BT might be the right for you.
You can read this article if you want to know more about the switching modes. For this to happen, the gate pin of the TRIAC should receive a voltage greater than the threshold gate voltage and should also get a current that is greater than gate trigger current.
We need special type of circuit called commutation circuit to turn of the SCR again. This commutation is normally done by reducing the load current forced commutation less than the holding current.
Other than controlling through switch the BT can also be controlled through a microcontroller or a microprocessor. This way the Load can not only be switched but also the output coltage can be controlled by using PWM signals for fast switching. Subscribe to stay updated with industry's latest Electronics components and news. It can be avoided by using a snubber circuit.
Similarly there is another effect called backlash effect. This problem can be solved by providing a resistance in series for the capacitance to discharge. When controlling the output AC voltage for dimmer or speed control applications a Zero crossing method is always recommended to be used. There is chance of backward current when the TRIAC is switching inductive loads, so an alternate discharge path has to be provided for the load to drain the inrush current.
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BT139-600 level. Datasheet pdf. Equivalent
BT139 Series E Triacs; Sensitive Gate