Connect with us

Identification of transistors

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

Scroll to continue with content
  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?
     
  2. 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
     
  3. 1853 and 1854 look like Hewlett Packard Numbers. the 4-892 is probably as
    well.
    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).
     
  4. Jim Adney

    Jim Adney Guest

    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.
    Not on my list
    not on my list

    -
     
  5. Franc Zabkar

    Franc Zabkar Guest

    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
     
  6. 1853 and 1854 look like Hewlett Packard Numbers. the 4-892 is probably
    as well.
    Thanks for the help guys. Yes the circuit drove the X and Y axis motors and
    the pen up and down.
    Pier
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-