BT169 DATASHEET PDF

The UTC BT is glass passivated, sensitive gate thyristors in a plastic envelope, intended for use in general purpose switching and phase control applications. These devices are intended to be interfaced directly to microcontrollers, logic integrated circuits and other low power gate trigger circuits. MAX B. MAX D. MAX E. MAX G.

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The PCR is a Logic Level Thyristor which is commonly used with microcontrollers and other low voltage systems for switching applications. The Thyristor has an on-state current of mA with a reverse blocking voltage of V.

Note: Complete Technical Details can be found at the datasheet given at the end of this page. BT, PCR This is because these types of SCR require very low gate voltage and gate current to turn them on.

As we know SCR is a current controlled device, hence the amount of current applied to gate depends on the voltage and current value that has to be switched. The below graph from datasheet can be used to determine the gate current. Initially, the switch S1 and S2 remains in normally-open state. When the supply ON, Thyristor remain reversed biased until the gate pulse provided. For providing gate pulse we have used Push Button S2.

As the S2 switch close, thyristor turns ON and latch even we release the push button S2. When the Thyristor has self-latched into the ON state, the only way to stop the Thyristor from conducting in this circuit is to interrupt the supply across the Thyristor.

For that, we use switch S1, which short-circuit the anode and cathode, due to which the holding current get decreased to its threshold value. Therefore, Thyristor gets reset or turns OFF. Resistance R1 used to provide sufficient gate current to turn ON the thyristor. Therefore, it prevents Thyristor from false triggering. If you are designing a PCD or Perf board with this component then the following picture from the Datasheet will be useful to know its package type and dimensions.

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