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A common emitter transistor is an amplifier. It amplifies its collector to base (icbo) leakage current.
You need to learn about the hFE of a transistor.
Sorry, I do not make transistors. Instead I simply select ones that are already made and use them in circuits that I have designed properly.
None of my many transistor circuits had any proplems caused by icbo or iceo.
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I noticed that this OP called p11 has posted many threads about the very basics of transistors. It is like he is reading a book and looking only at the titles of chapters then is asking questions about them.
Remember Walters (aka Billy Mayo, Danny Davis, Castillovanv, Vancastillo, PrescottDan, davewalker, and haroldbrown)? Him and all these aliases have been banned here and on other electronics forums.
I used 2N3904 and BC547 transistors for thousands of my circuit designs and they work perfectly. Their icbo and iceo are so small that they are not even spec'd on their datasheets. I never leave the base or emitter "open" anyway.
The iceo is listed as 0.3mA (at 25 degrees C) on the datasheet for the TIO31 power transistor but this transistor is used for fairly high currents so the iebo is tiny. but the base of a power transistor is never left open anyway so the iebo will never cause a problem in a circuit.
Did you learn what are alpha and beta of a transistor? I have never used alpha but the wide range of beta of a transistor listed on its datasheet is very important for you to design the circuit (with DC negative feedback) to reduce the effects of the wide range.
Maybe you are reading about the history of old transistors when they were made of germanium instead of modern silicon?
I looked on my Philips 1969 databook at the AC126 germanium transistor and its icbo is a maximum of 800uA when it is at 75 degrees C. Then the base needed a low value resistor to ground or a reverse input bias voltage to reduce it.