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It is clear from the figure that positive voltage is applied to the anode and cathode is set to ground. The junction of two external resistor is connected to gate which constructs a voltage divider circuit. Values of two resisters help in determining the peak voltage and intrinsic standoff voltage. Anode to cathode voltage is directly proportional to the anode current i.
The point at which anode to cathode Va voltage cannot be increased in called the saturation region. In this region maximum number of charges will be injected in the junction.
Beyond this point anode voltage decreases and anode current increases. This also represents the negative resistance region and this characteristic can be used in the Oscillators.
The point at which anode voltage cannot be reduced below minimum value, is called valley point. At this point, device will be fully saturated and junction will act like a saturated P-N junction.
The point at which anode to cathode voltage enters the negative resistance region is called peak voltage. Peak voltage can be represented in the following equation. Intrinsic standoff ration is the ration between R1 and the sum of R1 and R2. It will determine how much voltage will drop across cathode and gate terminal of PUT.
It is important to note that values given above are standard values. If values are exceeded from given value it can damage the device at large. If stresses are extended from the given operations conditions, they can harm the device reliability.
2N6027 Central Semiconductor, 2N6027 Datasheet
PDF 2N6027 Datasheet ( Hoja de datos )