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Substitute for 2N2222

Discussion in 'General Electronics Chat' started by ashfaqueahmadbari, Jul 4, 2008.

  1. ashfaqueahmadbari

    ashfaqueahmadbari New Member

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    I have seen many circuits using the 2N2222 transistor (correct me if it isn't one). one of them uses it to control electrical appliances. It says it can be substituted by a BC148. So I just wanted to know can the BC148 be used as a general substitute for 2N2222 or is it just the case in this one?

    Here's the schematic

    http://www.electronic-circuits-diagrams.com/computersimages/1.gif

    Any help would be appreciated.

    Thanks in advance
     
  2. ericgibbs

    ericgibbs Well-Known Member Most Helpful Member

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    hi,
    You can get both datasheets from DatasheetArchive :: Free Datasheet Search Engine :: Electronic Components
    and compare the specification.

    Check the Ic's max rating, 100mA BC148 and 600mA for the 2N2222
     
    Last edited: Jul 4, 2008
  3. Boncuk

    Boncuk New Member

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    The 2N2222 can be replaced without problems by the BC337. The 2N2222 has a TO18A package (similar to TO92, but metal can) and the BC337 has a TO92 package. That one can handle up to 800mA.
     
  4. dave

    Dave New Member

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  5. mvs sarma

    mvs sarma Well-Known Member

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    @ashfaqueahmadbari

    You may use 2N3904
     
  6. audioguru

    audioguru Well-Known Member Most Helpful Member

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    The BC148 was used 44 years ago. I have some. It has discontinued about 34 years ago.
    The latest one is the BC548 in a TO-92 case.
    The 2N3904 is the same but its collector and emitter are reversed.
    Use a 2N4401 if you want the same high output current of an old 2N2222.
     
  7. gramo

    gramo New Member

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    Im a big fan of the 2N4401!

    Also, just incase your ever wondering, the 2N4403 is a good pnp solution with similar specs
     
  8. mneary

    mneary New Member

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    In the OP's circuit this is true because it only needs to pass 60 mA. However the 2N3904 is not a universal replacement for 2N2222 because of a lower current rating.
     
  9. Krumlink

    Krumlink New Member

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    If you need to drive lots of current, use a ZTX649, but I would not reccomend it as it is very expensive.
     
  10. Hero999

    Hero999 Banned

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    It also has a slightly lower GBWP but this isn't important here.
     
  11. Gayan Soyza

    Gayan Soyza Active Member

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    I wonder where you live? If you cannot find 2N series there then you never cannot find a BC148 series out there.

    The BC148 is very old as Audio mentioned but 2N series is commonly available.
     
    Last edited: Jul 7, 2008
  12. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    They may be commonly available where you are, but BC series transistors are commonly available in Europe, which is where they come from - far easier than non-European 2N series.
     
  13. mvs sarma

    mvs sarma Well-Known Member

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    BC 148/158 were also manufactured in India and now a days, we get BC547/BC557 and BC548/BC558- in local make as well as Philips, in TO92 case.
    the 2N2222 and likes are also made In India and from Taiwan.
    Industrial usage, they prefer metal can and for commercial, TO92.
     
  14. Gayan Soyza

    Gayan Soyza Active Member

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    Nothing to worry where the transistors came from.Job,price & availability is more important.

    2N series more common than some BC series (BC148) including OP has "seen many circuits using the 2N2222 transistor"
     
  15. ashfaqueahmadbari

    ashfaqueahmadbari New Member

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  16. Boncuk

    Boncuk New Member

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    :):) It's a transistor!
     
  17. Torben

    Torben Well-Known Member

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    That's almost like saying "That's not a dog, that's a German Shepherd". Most opto-isolators come in an IC package.


    Torben
     
  18. AllVol

    AllVol New Member

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    I thought the Ic Eric was talking about was collector current. Alas.
     
  19. Torben

    Torben Well-Known Member

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    He was. :) I was just responding to the other post.


    Torben
     
  20. ashfaqueahmadbari

    ashfaqueahmadbari New Member

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    hmmm... i didn't realise that's what was meant. thanx for updating me.

    :)now i'll remember a german shepherd's a dog:p
     
    Last edited: Jul 19, 2008

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