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Part ID- analog devices

Discussion in 'Electronic Design' started by amdx, Oct 31, 2007.

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  1. amdx

    amdx Guest

    While doing a clean up, I ran across 3 parts (hybrid/ics) made by Analog
    Devices part number 118A.
    The part is 1" x 1" x 1/2" tall. It has 7 pins, 5 along one side
    of the bottom and 2 along the other side of the bottom.
    It has a date code of 8301.
    Any idea what the function of this part is?
    Thanks, Mike
     
  2. ssylee

    ssylee Guest

    Is there any other information on the chip (complete part number)?

    Stanley
     
  3. Tom Bruhns

    Tom Bruhns Guest

    With that date code, it sounds like a paper weight for small pieces of
    paper to me. Or perhaps filler for small empty spaces in the dust
    bin. To others, it may be an "important" piece of history. Why not
    sent an email to Analog Devices and ask them? If you phrase it as
    idle curiosity and not a need for applications info, they very well
    may answer.

    Cheers,
    Tom
     
  4. amdx

    amdx Guest

    The part has no other info, it just says:
    Analog Devices
    118A
    And then a date code on the side.
     
  5. ssylee

    ssylee Guest

    Do you have the complete part number (something before or after 118A)?

    Stanley
     
  6. I believe that _is_ the complete part number. ADI started out making
    modular op-amps, little boards potted into black epoxy. Some models
    were manufactured well into the 1980s, this sounds like one. I gave
    all my antique catalogs to the worldwide applications group, but their
    library is upstairs in my building, so I'll check when I get to work.

    Steve (ADI employee)

    PS Private email requires that you first remove the 3-letter food item
    from the posting address
     
  7. amdx

    amdx Guest

    I'd appreciate a look, just for the fun of it!
    Thanks, Mike
     
  8. legg

    legg Guest

    Standard op amp, but I'm suprised they were still making them in '83.

    It shares the package of the 'computing amplifiers' originally
    marketed by Teledyne Philbrick. Both terms are searchable, or:

    http://www.philbrickarchive.org/
    http://www.analog.com/library/analogDialogue/archives/philbrick/computing_amplifiers.html
    75M catalogue

    118A is more common.
    +/- 18V
    300KHz GBP
    internally compensated
    Vio 5mV+/- 20uV/C
    Ib 35nA
    Io 3nA
    Iout 4mA
    CMRR 70dB
    PSRR 63dB
    Rin 100K

    RL
     
  9. I finally remembered to look this guy up today. There was a datasheet
    for it in the 1975 catalog, and it was listed as "still available" in
    the 1978 book, though with no data. It's a modular bipolar-input
    op-amp, with specs somewhat better than a 741. It's nothing great
    by today's standards, but for the early '70s it was quite a good piece
    of work. The single-piece price for the "A" version (-25C to 85C)
    was $14 in 1975.

    steve
     
  10. legg

    legg Guest

    In the '75 catalog, does the package info indicate that there is a
    location on the body for a date code marking? I don't think I've ever
    seen one that was date coded.

    RL
     
  11. I'll have to look. I have an old OEI modular amp on my desk with
    no date code, but I don't know ADI's practice. I worked somewhere
    else in the company when they were still making modules. Stay
    tuned...
     

  12. OK,I finally remembered to check the old books when the "library"
    was not being used as a super-secret conference room.

    There's no specific mention of datecode labeling on any of the package
    drawings I checked in either the 1975 or 1978 catalogs, both of which
    still listed a variety of modular products. That doesn't mean ADI
    didn't mark the parts though - coding would have been needed to
    manage warranty returns. I don't know what the warranty period was,
    but I'm sure there was one.

    steve
     
  13. legg

    legg Guest

    I have no Philbrick samples showing datecodes or batch markings before
    '68 (actually Philbrick/Nexus by then), or AD datecodes on potted
    assemblies before '74, including binary D/A converter modules.

    There are also early potted parts from Toshiba without date codes or
    batch markings.

    Film capacitors and trim pots on the same assemblies DO have them as
    early as '67, so go figure.

    Perhaps there were no large volume or military applications for these
    parts.

    RL
     
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