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Can two back to back diode serve as transistor?
But is case two discrete back-to-back diodes, there are four doped region instead of three. Hence two diodes connected back-to-back can never work as a transistor.
Can two pn junction diode placed back to back work as PNP transistor?
No, because in this case n-region will be too thick and so most of the majority charge carriers rushing from emitter to collector will be neutralized in the base. As a result the transistor will not work.
Can diode be used as transistor?
Since a bipolar transistor is essentially two diodes, it can function as such. However, since bipolar transistors are not designed to be used as diodes, using them as diodes might cause a problem in terms of current and other ratings. Use dedicated diodes for typical diode applications instead of bipolar transistors.
Why are two back to back diodes not a transistor?
Once a metal introduced in this path (which is what two back-to-back diodes represent) , no BJT functionality is possible. No. Two back to back diodes is NOT a transistor. The special property that makes a PNP or NPN sandwich a transistor rather than just two diodes is that the base layer is very thin.
Why are two PN diodes not a BJT?
Two back-to-back PN diodes can’t function as a single BJT because transistor’s functionality requires semiconductor only Base region. Once a metal introduced in this path (which is what two back-to-back diodes represent) , no BJT functionality is possible.
Can a PNP sandwich be a transistor?
No. Two back to back diodes is NOT a transistor. The special property that makes a PNP or NPN sandwich a transistor rather than just two diodes is that the base layer is very thin. In semiconductor physics terms, there aren’t two separate depletions regions in the base.
Why are NPN transistors reverse biased and reverse biased?
Because transistor operation relies on the Base region being very thin and the Collector region near the Base being lightly doped. This creates a very strong electric field across a short distance. In an NPN transistor, the CB (collector-base) junction is reverse biased and has a strong electric field across it.