Identification of transistors

Discussion in 'Electronic Components' started by Pier Federici, Jul 2, 2005.

  1. TIA.

    I have three transistors that I have been unable to identify.

    I understand that the 185 prefix identifies the chips as Motorola and I
    think that the MEX means that they are made in Mexico.

    All of the markings on chip 1 (T03 package)
    1853-0511
    MEX
    8535

    All of the markings on chip 2 (T03 package)
    1854-0774
    MEX
    8533

    All of the markings on chip 3
    4-892
    HP
    RCA 523

    Can anyone help?
    Pier Federici, Jul 2, 2005
    #1
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  2. "Pier Federici" <> wrote in message
    news:42c63f09$0$20026$...
    > TIA.
    >
    > I have three transistors that I have been unable to identify.
    >
    > I understand that the 185 prefix identifies the chips as Motorola and I
    > think that the MEX means that they are made in Mexico.
    >
    > All of the markings on chip 1 (T03 package)
    > 1853-0511
    > MEX
    > 8535
    >
    > All of the markings on chip 2 (T03 package)
    > 1854-0774
    > MEX
    > 8533
    >
    > All of the markings on chip 3
    > 4-892
    > HP
    > RCA 523
    >
    > Can anyone help?


    1853 and 1854 look like Hewlett Packard Numbers. the 4-892 is probably as well.
    My cross reference list does not have the 1853-0511.
    and the 1854-0774 I can't read. it looks like 2N6056. Sorry Colin
    Colin Horsley, Jul 2, 2005
    #2
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  3. > 1853 and 1854 look like Hewlett Packard Numbers. the 4-892 is probably as
    well.
    > My cross reference list does not have the 1853-0511.
    > and the 1854-0774 I can't read. it looks like 2N6056. Sorry

    Colin
    >
    >

    Thanks Colin.
    OK I forgot to tell you that I grabbed the components out of an old HP pen
    plotter.
    The 4 on the 1854-0774 and the 11 on the 1853-0511 look like they were added
    after the other numbers (type spacing and thickness of font).
    Pier Federici, Jul 2, 2005
    #3
  4. Pier Federici

    Jim Adney Guest

    On Sat, 2 Jul 2005 17:17:21 +1000 "Pier Federici" <> wrote:

    >I have three transistors that I have been unable to identify.


    These are all HP part #s. 4-892 is probably shorthand for 1854-0892,
    which is what they did when the part was too small for the whole
    number.

    >All of the markings on chip 1 (T03 package)
    >1853-0511


    Not on my list

    >All of the markings on chip 2 (T03 package)
    >1854-0774


    2N6056

    >All of the markings on chip 3
    >4-892


    not on my list

    -
    -----------------------------------------------
    Jim Adney
    Madison, WI 53711 USA
    -----------------------------------------------
    Jim Adney, Jul 4, 2005
    #4
  5. Pier Federici

    Franc Zabkar Guest

    On Sat, 2 Jul 2005 20:36:16 +1000, "Pier Federici" <> put finger
    to keyboard and composed:

    >> 1853 and 1854 look like Hewlett Packard Numbers. the 4-892 is probably as

    >well.
    >> My cross reference list does not have the 1853-0511.
    >> and the 1854-0774 I can't read. it looks like 2N6056. Sorry

    >Colin
    >>
    >>

    >Thanks Colin.
    >OK I forgot to tell you that I grabbed the components out of an old HP pen
    >plotter.
    >The 4 on the 1854-0774 and the 11 on the 1853-0511 look like they were added
    >after the other numbers (type spacing and thickness of font).


    Could 1853-0511 be the PNP complement to the 2N6056, ie a 2N6054? Does
    it test as a PNP Darlington? Were these transistors driving the XY
    motors?


    - Franc Zabkar
    --
    Please remove one 's' from my address when replying by email.
    Franc Zabkar, Jul 5, 2005
    #5
  6. > >> 1853 and 1854 look like Hewlett Packard Numbers. the 4-892 is probably
    as well.
    > >> My cross reference list does not have the 1853-0511.
    > >> and the 1854-0774 I can't read. it looks like 2N6056. Sorry

    > >Colin
    > >>
    > >>

    > >Thanks Colin.
    > >OK I forgot to tell you that I grabbed the components out of an old HP

    pen
    > >plotter.
    > >The 4 on the 1854-0774 and the 11 on the 1853-0511 look like they were

    added
    > >after the other numbers (type spacing and thickness of font).

    >
    > Could 1853-0511 be the PNP complement to the 2N6056, ie a 2N6054? Does
    > it test as a PNP Darlington? Were these transistors driving the XY
    > motors?
    >


    Thanks for the help guys. Yes the circuit drove the X and Y axis motors and
    the pen up and down.
    Pier
    Pier Federici, Jul 7, 2005
    #6
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