In most cases you could. BC547 and BC548 are essentially the same but BC547 has a higher breakdown voltage whereas BC548 has low noise. These are the most general purpose NPN silicon transistors and changing one with the other does not noticably (or otherwise) affect the circuit. I once used one BC547 and one BC548 for the basic astable multivibrator circuit and there were no problems. There, I gave you a hands-on example!Quora.com Navin Kumar Oct. 4th, 2017
You will be fine with BC548, BC547 or 2N3904 your application is not demanding.Stackexchange Nov27th, 2015
According to semiconductor physics gain and breakdown voltage are interchangeable. High voltage transistors tend to have lower gain and low voltage transistors tend to have higher gain. The gain differences are not huge when comparing the 547 & 548.
BC546/547/548/549/550 is made from the same process (the same silicon die) but just different screening based on different parameters. It just like screening eggs with different sizes.
You can definitely use BC547 instead of BC548 as everything are the same and BC547 has a better VCEO rating of 45V.
However, the manufacturer will probably sell BC547 at a high price than BC548 because for better rating and maybe lower yield rate (number of units per silicon wafer).
The author was the global business manager of the Discrete division of National Semiconductor in Silicon Valley in the late ’80s.
To buy BC547 or BC548 at a low price and good quality, you can go to 1N4148.com
1N4148 vs 1N914 or 1N4448 Many young engineers having trouble with so many part numbers of general-purpose switching diodes and don’t know how to make the selection. “1N914 and 1N4148 diodes can be used interchangeably. 1N4148 is considered as advanced version of 1N914 but technically there is not much difference. Only difference is that 1n4148...
BC546 vs BC547/BC549 Fairchild Datasheet tells you all about BC54x family of transistors High Voltage: BC546, VCEO=65V Low Noise: BC549, BC550 VCEO Collector-Emitter Voltage : BC546 : 65V BC547/550 : 45V BC548/549: 30V 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...