What is inside of a NPN and PNP transistor

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01:40:24

Inside of every transistor is basically 2 Diodes. In a NPN (left) the diodes are pointing away from each other. In a PNP (right) they are pointing towards each other.

published 7 years ago

rezz

7 years ago

One small noted issue is that you have both diodes as equal. Actual transistors have a diffrence in saturation and doping between the collector and emitter.

hurz

7 years ago

@darkphoenix2711, you think this is inside a transistor, but this is a little to simple and does not work as transistor. E.g. for an NPN you model NP copper wire PN, but between P and P layer there is no physical contact which is the Base. Your model does not have current gain. So a transistor is much more then just two diodes.

darkphoenix2711

7 years ago

Thank you for your comments. I know the transistor doesn't actually contain 2 diodes.I just thought that it may be Educational to imagine it as diodes because more people knows how diodes work and it is easier to conceptualize the properties of the PNP and NPN polarity this way.

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