Can the 2N2222A be substituted for the 2N2222

NavNav Posts: 23
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

  • 8 Comments sorted by Date Added Votes
  • PJAllenPJAllen Banned Posts: 5,065
    edited July 2007 Vote Up0Vote Down
    2N2222A, PN2222, "it's all good."
    A 2N3904 will "work," too.
    Go for it.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited July 2007 Vote Up0Vote Down
    Just be sure of the current rating...The 2N3904 handles slightly less current than a 2N2222. Take care.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Chris Savage
    Parallax Tech Support
    Chris Savage | Engineering Tech | Main Office: (916) 624-8333 | Direct to Tech Support: (888) 997-8267 | Website | Twitter | Google+
  • NavNav Posts: 23
    edited July 2007 Vote Up0Vote Down
    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 July 2007 Vote Up0Vote Down
    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.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "Everything in the world is purchased by labour; and our passions are the only causes of labor." -- David·Hume (1711-76)········
    ···················· Tropically,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
    Hwang Xian Shen, Puddleby-on-the-Marsh.
    All things considered, I can live and thrive without Microsoft products. LINUX is just fine.
  • theenggprojectstheenggprojects Posts: 1
    edited December 10 Vote Up1Vote Down
    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.
  • 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.
    "When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."

    - Pablo Picasso
  • 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
    "When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."

    - Pablo Picasso
  • 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 ;)
    My Prop boards: P8XBlade2, RamBlade, CpuBlade, TriBlade
    Prop OS (also see Sphinx, PropDos, PropCmd, Spinix)
    Website: www.clusos.com
    Prop Tools (Index) , Emulators (Index) , ZiCog (Z80)
Sign In or Register to comment.