BC546/547/548/549/550 is made from the same process (the same silicon die) but just different screening based on different parameters.
BC546 is unique for high voltage applications.
You can use BC546 to replace BC547 and BC548, but cannot replace BC549 and BC550 which are screened for low noise applications.
Vceo rating of a transistor process is made by design, therefore, technically, BC546/547/548/549/550 should all have a minimum value of 65V !
The author was the global business manager of the Discrete division of National Semiconductor in Silicon Valley in the late ’80s.
To buy BC546/547/548/549/550 at a low price and good quality, you can go to 1N4148.com
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