laurie wrote: ↑Sun Dec 04, 2022 1:17 am
With sincere apologies for not letting go of this subject... this is not the right description of a transistor.
A diode is like a non-return valve. Current will flow "unimpeded" in one direction, and not at all in the other.
A BJT is like a faucet - the amount of current flowing between Collector and Emitter is controlled by the current injected (or removed) at the Base. Two diodes back-to-back simply would not behave like that.
The "large signal" Ebers–Moll model looks like two diodes back-to-back, but that isn't what it is implying.
This diagram gives a good visual:
https://en.wikipedia.org/wiki/Bipolar_j ... %20regions.
No problem to not let it go, I appreciate your will to share your knowledge.
Again, I should had being more specific, sorry, but I wasn't describing the transistor's function/works as the same as of 2 diodes.
I was talking about physical construction.
If you ask google : "is a bipolar transistor 2 diodes?", the answer will be:
"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."
Another answer, this time for a BJT:
"BJTs can be thought of as two diodes (P–N junctions) sharing a common region that minority carriers can move through. A PNP BJT will function like two diodes that share an N-type cathode region, and the NPN like two diodes sharing a P-type anode region."
As I said, physical construction, and
in the context of being affected by temperature, not that they works the same way.
P.S.: I edited the original post to make it more clear and to mean what I really wanted to say, sorry for the misunderstanding.