This question has been asked several times but most answers are outdated. In looking over spec's and considering availability, I am considering that the BC550 is a very good choice, even though pin-outs are different, and I don't have to source unknowns on E-Wish...(they wish they could sell at that price.) Does any have a better choice to suggest to source from vendors like Mouser?
Best Regards!
Tom.
Best Regards!
Tom.
The BC550 should still be available, but the PNP (BC560) is unavailable so you can't get a complementary pair. However, if the circuit voltage is low, then the lower-voltage BC549/BC559 seems to be available still.
Mouser shows On's as obsolete, but do offer a TSMC version of the device. Probably close enough.
No they show the older Onsemi bulk version as obsolete. The current bulk and taped versions (BC550CBU/CTA) are still available. They are probably going as well, but for now there is still stock.
Thanks for all the replies. At the lower voltages, BC549 is good as well. Also from my own testing, 15v @ @2 ma, a 2n3904 is extremely low noise also. And while older is still readily available, as is a 3906. As with any transistor higher voltage and higher current means higher noise. At least no one has found anything different. Thanks to all.