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Can the 2N2222A be substituted for the 2N2222 — Parallax Forums

Can the 2N2222A be substituted for the 2N2222

NavNav Posts: 23
edited 2007-07-24 12:32 in General Discussion
I see a lot of Stamp related circuits specifying a 2N2222 transistor.· The 2N2222 is very difficult/impossible to find - here in the UK, at least.· The 2N2222A is very easy to obtain and very cheap.· Can the 2N2222A be used instead of the 2N2222 ?

Comments

  • PJAllenPJAllen Banned Posts: 5,065
    edited 2007-07-23 22:07
    2N2222A, PN2222, "it's all good."
    A 2N3904 will "work," too.
    Go for it.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2007-07-23 22:41
    Just be sure of the current rating...The 2N3904 handles slightly less current than a 2N2222. Take care.

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    Parallax Tech Support
  • NavNav Posts: 23
    edited 2007-07-24 08:41
    Those were just the sort of answers I was hoping for ! Thank you PJ and Chris for your prompt replies.
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2007-07-24 12:32
    The 'A' might be related to packaging. I have 2n2222 transistors in metal packages and in black plastic. If it is going to get hot, the metal is better.

    Generally the 2n2222 is more able to handle higher power than the 2n3904, but can replace the 2n3904 in just about any circuit. So don't bother to buy both.

    A lot of transistors are 'swap-able'. You can really struggle to get exactly the same number when there are likely to be a dozen of similar ones that can do the same job.

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  • theenggprojectstheenggprojects Posts: 1
    edited 2017-12-10 15:24
    Hi,

    If you are planning to work on 2n2222, then you must have a look at Introduction to 2n2222. I have shared detailed overview of how it works and have also shared its working Proteus Simulation.

    Thanks.
  • ercoerco Posts: 20,256
    Syed: Welcome to the forum and thanks for the link. At a quick glance, it looks like a great tutorial. Will take a closer look later.

    BTW, this post is 10 years old, so don't let it dampen your enthusiasm to help if the OP is long gone.

    Your site has several other interesting pages, I look forward to checking it out over the break when I have more time.
  • ercoerco Posts: 20,256
    Beware the P2N2222A's reversed pins! This snagged me once too.

    http://www.analogzoo.com/2015/03/beware-the-p2n222a/

    2N2222%2C_PN2222%2C_and_P2N2222_BJT_Pinout.jpg
  • Cluso99Cluso99 Posts: 18,069
    erco wrote: »
    Beware the P2N2222A's reversed pins! This snagged me once too.

    http://www.analogzoo.com/2015/03/beware-the-p2n222a/

    2N2222%2C_PN2222%2C_and_P2N2222_BJT_Pinout.jpg
    +1 ;)
  • quickengprojectsquickengprojects Posts: 2
    Yes, it will work as long as both transistors come with same absolute maximum ratings. Make sure, the project you are working on, must resonate with the ratings of the transistor. However, you can have a look at Introduction to 2n2222 if you are unsure about ratings. They have also given Proteus simulation.
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