PUT, DIAC and TRIAC Flashcards
is an electronic semiconductor device that can have their switching parameters set by external resistors.
Programmable UJT (PUT)
What are some most common PUTs
2N6027 and 2N6028
How many layers does a PUT have?
4 layers
What are the terminals of a PUT?
Anode, Cathode, Gate
What parameters of PUTs can be programmed?
intrinsic standoff ratio and peak voltage
The only manufacturer of PUT
ON Semiconductor
The particular level where the anode voltage is reduced to for the device to become fully saturated and no more decrease in this voltage is possible.
Valley Point
It is the anode to cathode voltage after which the PUT jumps into the negative resistance region.
Peak Voltage
What is the formula for the intrinsic standoff ratio of a PUT?
R1/(R1+R2)
Most common application of a PUT.
Relaxation Oscillators
What kind of waves are formed in a relaxation oscillator?
Sawtooth Waveforms
Is a diode that conducts electrical current only after its breakover voltage has been reached.
DIAC
What does DIAC mean?
Diode for Alternating Current
How many electrodes does a DIAC have?
2 electrodes
Main application of a DIAC
TRIAC triggering circuit
What are the terminals of a DIAC?
MT1, MT2
A three terminal AC switch which is different from the other silicon controlled rectifiers in the sense that it can conduct in both directions
TRIAC
What are the terminals of a TRIAC?
MT1, MT2, Gate
Voltage at terminal 2 of a TRIAC is positive with respect to terminal 1 and gate voltage is also positive
First Quadrant Operation of TRIAC
Voltage at terminal 2 of a TRIAC is positive with respect to terminal 1 and gate voltage is negative
Second Quadrant Operation of TRIAC
Voltage of terminal 1 is positive with respect to terminal 2 and gate voltage is negative
Third Quadrant Operation of TRIAC
Voltage of terminal 1 is positive with respect to terminal 2 and gate voltage is positive
Fourth Quadrant Operation of TRIAC
