how to find equivalent transistor

Discussion in 'Hobby Electronics' started by TonyS, Sep 25, 2008.

  1. TonyS

    TonyS Guest

    Hi,

    I need to replace a 8050 transistor.
    I found the data sheet on the web but no source to buy one.
    (NPN TO92 IC 800mA 30V switching/audio, drives a siren pieco)
    What's a proper way to find an equivalent transistor that's actually available?

    Cheers

    Tony
    TonyS, Sep 25, 2008
    #1
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  2. TonyS

    Franc Zabkar Guest

    On Thu, 25 Sep 2008 13:53:40 +0800, TonyS <>
    put finger to keyboard and composed:

    >Hi,
    >
    >I need to replace a 8050 transistor.
    >I found the data sheet on the web but no source to buy one.
    >(NPN TO92 IC 800mA 30V switching/audio, drives a siren pieco)
    >What's a proper way to find an equivalent transistor that's actually available?
    >
    >Cheers
    >
    >Tony


    These are just "jelly bean" general purpose transistors:
    http://www.datasheetarchive.com/pdf-datasheets/Datasheets-5/DSA-87957.pdf

    A BC337A looks like it might substitute for it:
    http://www.datasheetarchive.com/pdf-datasheets/Datasheets-12/DSA-228097.pdf

    Just be careful of the pinout. One is EBC, the other is CBE.

    - Franc Zabkar
    --
    Please remove one 'i' from my address when replying by email.
    Franc Zabkar, Sep 25, 2008
    #2
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  3. TonyS

    TonyS Guest

    Franc Zabkar wrote:
    > On Thu, 25 Sep 2008 13:53:40 +0800, TonyS <>
    > put finger to keyboard and composed:
    >
    >> Hi,
    >>
    >> I need to replace a 8050 transistor.
    >> I found the data sheet on the web but no source to buy one.
    >> (NPN TO92 IC 800mA 30V switching/audio, drives a siren pieco)
    >> What's a proper way to find an equivalent transistor that's actually available?
    >>
    >> Cheers
    >>
    >> Tony

    >
    > These are just "jelly bean" general purpose transistors:
    > http://www.datasheetarchive.com/pdf-datasheets/Datasheets-5/DSA-87957.pdf
    >


    Using some random NPNs from my junk box produced a lot of dead bodies though:)

    > A BC337A looks like it might substitute for it:
    > http://www.datasheetarchive.com/pdf-datasheets/Datasheets-12/DSA-228097.pdf
    >
    > Just be careful of the pinout. One is EBC, the other is CBE.
    >
    > - Franc Zabkar



    I can get a BC337 from Altronics. Will watch pinout:)
    Easier than I thought!

    Thanks!

    Tony
    TonyS, Sep 25, 2008
    #3
  4. TonyS

    Phil Allison Guest

    "TonyS"

    >
    > What's a proper way to find an equivalent transistor that's actually
    > available?
    >



    ** There is no simple procedure for such a complex task - anyone who
    tells you there is a fool or a damn liar.




    ..... Phil
    Phil Allison, Sep 25, 2008
    #4
  5. TonyS

    TonyS Guest

    Phil Allison wrote:
    > "TonyS"
    >
    >> What's a proper way to find an equivalent transistor that's actually
    >> available?
    >>

    >
    >
    > ** There is no simple procedure for such a complex task - anyone who
    > tells you there is a fool or a damn liar.
    >
    >
    >
    >
    > .... Phil
    >
    >
    >
    >
    >

    You are right.
    When data sheets where still in books I used to have a book with tables that
    showed equivalent devices by different manufacturers. I was hoping that the web
    has something like this to offer.
    In this case hFE is important. The driving circuit is just 2*4069 inverters in
    parallel over 100 Ohms. The load is an unknown transformer.

    Tony
    TonyS, Sep 25, 2008
    #5
  6. TonyS

    ian field Guest

    "TonyS" <> wrote in message
    news:48db2768$0$16041$...
    > Hi,
    >
    > I need to replace a 8050 transistor.
    > I found the data sheet on the web but no source to buy one.
    > (NPN TO92 IC 800mA 30V switching/audio, drives a siren pieco)
    > What's a proper way to find an equivalent transistor that's actually
    > available?
    >
    > Cheers
    >
    > Tony


    The 8050 is a fairly good spec for a TO92 device, if a TO126 part will fit
    the available space it would be much easier to find a device that meets or
    exceeds the most important parameters.
    ian field, Sep 25, 2008
    #6
  7. TonyS

    TonyS Guest

    Franc Zabkar wrote:
    > On Thu, 25 Sep 2008 13:53:40 +0800, TonyS <>
    > put finger to keyboard and composed:
    >
    >> Hi,
    >>
    >> I need to replace a 8050 transistor.
    >> I found the data sheet on the web but no source to buy one.
    >> (NPN TO92 IC 800mA 30V switching/audio, drives a siren pieco)
    >> What's a proper way to find an equivalent transistor that's actually available?
    >>
    >> Cheers
    >>
    >> Tony

    >
    > These are just "jelly bean" general purpose transistors:
    > http://www.datasheetarchive.com/pdf-datasheets/Datasheets-5/DSA-87957.pdf
    >
    > A BC337A looks like it might substitute for it:
    > http://www.datasheetarchive.com/pdf-datasheets/Datasheets-12/DSA-228097.pdf
    >
    > Just be careful of the pinout. One is EBC, the other is CBE.
    >
    > - Franc Zabkar


    Tried the BC337.
    Blew up after 20 seconds:)
    Was worth a try for $0.35

    Tony
    TonyS, Sep 27, 2008
    #7
  8. TonyS

    TonyS Guest

    ian field wrote:
    > "TonyS" <> wrote in message
    > news:48db2768$0$16041$...
    >> Hi,
    >>
    >> I need to replace a 8050 transistor.
    >> I found the data sheet on the web but no source to buy one.
    >> (NPN TO92 IC 800mA 30V switching/audio, drives a siren pieco)
    >> What's a proper way to find an equivalent transistor that's actually
    >> available?
    >>
    >> Cheers
    >>
    >> Tony

    >
    > The 8050 is a fairly good spec for a TO92 device, if a TO126 part will fit
    > the available space it would be much easier to find a device that meets or
    > exceeds the most important parameters.
    >
    >

    Found a good one in TO92, 2STX1360.
    http://www.st.com/stonline/products/literature/ds/11763.pdf
    Vce sat 150mV typ @ 2A.
    Don't know where to get it, apart from Digikey...
    There would be space for a larger package though, any suggestions?
    Already feeling a bit silly trying to fix the thing;-(

    Tony
    TonyS, Sep 27, 2008
    #8
  9. TonyS

    ian field Guest

    "TonyS" <> wrote in message
    news:48ddc4ee$0$16025$...
    > ian field wrote:
    >> "TonyS" <> wrote in message
    >> news:48db2768$0$16041$...
    >>> Hi,
    >>>
    >>> I need to replace a 8050 transistor.
    >>> I found the data sheet on the web but no source to buy one.
    >>> (NPN TO92 IC 800mA 30V switching/audio, drives a siren pieco)
    >>> What's a proper way to find an equivalent transistor that's actually
    >>> available?
    >>>
    >>> Cheers
    >>>
    >>> Tony

    >>
    >> The 8050 is a fairly good spec for a TO92 device, if a TO126 part will
    >> fit the available space it would be much easier to find a device that
    >> meets or exceeds the most important parameters.

    > Found a good one in TO92, 2STX1360.
    > http://www.st.com/stonline/products/literature/ds/11763.pdf
    > Vce sat 150mV typ @ 2A.
    > Don't know where to get it, apart from Digikey...
    > There would be space for a larger package though, any suggestions?
    > Already feeling a bit silly trying to fix the thing;-(
    >
    > Tony


    One thing to watch is the pin-out, the datasheet I found for the 8050
    (SS8050) shows centre pin base, the ST part and also the TO126 option I
    suggested both have centre pin collector, The TO92 or TO92L would be easier
    to bend the pins to fit than a TO126 but if you're never going to have to
    change the transistor again it might be worth cutting and patching the
    tracks.
    ian field, Sep 27, 2008
    #9
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