Can anyone help me find equivalent components to the transistor BC548? I've been searching since days ago, no luck.
Please help me find SMD equivalents to BC548
- Thread starter spikespiegelbebop
- Start date
BC848
. . . buy why do you need equivalents when you can easily buy BC548s?
https://www.rapidonline.com/Catalogue/Search?Query=BC548
and BC546 and BC547 are the same thing graded for higher voltage.
I want to build a board the smaller as possible.
Thanks, I'll look into it.
I've checked the SMD equivalents from that article, all of them have way smaller power and frequency. Is it ok to use them anyway?
DickCappels
- Joined Aug 21, 2008
- 10,187
What can you tell us about the circuit(s) they will be used in?
Yes - if you don't need the extra power dissipation. The ft value will probably vary with the mid-band hfe, which can vary from 110 to 800 over the different grades, so the difference between the two datasheets is irrelevant.
Power dissipation of SM devices will vary according to how much track it is soldered to.
It's for this project.
Well didn't you work out how much power dissipation you needed?
If you need to save space, you can get double versions (BCM848)
You mean BC848?
https://assets.nexperia.com/documents/data-sheet/BCM847DS.pdf
(but it's only available as the higher voltage version)
A higher voltage shouldn't be a problem, right? I mean, isn't a higher voltage just an indicative that the component can support a higher voltage, instead of always working at a higher voltage?
It just indicates that it will withstand a higher voltage.
Fairchild datasheets used to tell you the "process" that the transistors came from. BC546, BC547, BC548 and BC549 all came from the same process. Maybe they came from the same dice, and are just selected for voltage, or maybe they use higher resistivity silicon for the higher voltage devices. (Someone on this forum will know).
If it is higher resistivity silicon, then it means that the saturation voltage is likely to be slightly higher.
How about this one from Digikey
https://assets.nexperia.com/documents/data-sheet/BC856-Q_BC857-Q_BC858-Q.pdf
https://assets.nexperia.com/documents/data-sheet/BC856-Q_BC857-Q_BC858-Q.pdf
I don't know, the original BC548 has a frequency of 300mhz, that one has a frequency of 100mhz, 3 times lower.
:emojithinking:
Why is that parameter important to you in your application?
https://diotec.com/request/datasheet/bc846.pdf
You want the BC849C
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I'm checking that one, but there's also a list that I created and would like to consider.
First the non-SMD ones with the original values:
https://alltransistors.com/adv/pdfview.php?doc=bc546_bc547_bc548.pdf&dire=_motorola
Now the list of the SMD versions:
https://alltransistors.com/transistor.php?transistor=23613
https://alltransistors.com/transistor.php?transistor=70670
https://alltransistors.com/transistor.php?transistor=23606
https://alltransistors.com/transistor.php?transistor=64821
https://alltransistors.com/transistor.php?transistor=23615
https://alltransistors.com/pdfview-s.php?doc=bc846alt&dire=05
https://alltransistors.com/pdfview-s.php?doc=bc846w&dire=05
https://alltransistors.com/pdfview-s.php?doc=bc846t_847t_series_3&dire=05
https://alltransistors.com/pdfview-s.php?doc=bc846awt&dire=05
https://alltransistors.com/pdfview-s.php?doc=bc846_847_3&dire=05
https://alltransistors.com/pdfview-s.php?doc=bc846_sam&dire=05
https://alltransistors.com/transistor.php?transistor=23407
https://alltransistors.com/transistor.php?transistor=23674
Which ones have closer values to the BC546 (or BC548)?
You've done the hard part, now you tell us.
Hey, just remembered something. In that article is saying:
"Equivalents: if no BC548 then use BC549, PN100, 2N3904 or 2SC1815 (i.e. pretty much any general purpose NPN transistor with a beta > 100)."
So it means that I should only consider that value? But what is this beta value anyway? Because I can't find anything like that in datasheets.
"Equivalents: if no BC548 then use BC549, PN100, 2N3904 or 2SC1815 (i.e. pretty much any general purpose NPN transistor with a beta > 100)."
So it means that I should only consider that value? But what is this beta value anyway? Because I can't find anything like that in datasheets.
