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Eurocard Format PCB

Discussion in 'Electronic Design' started by [email protected], Jun 23, 2006.

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  1. Guest

    I've been looking at some various PCB formats and found something I
    don't understand.

    The original VME Bus format was called the Eurocard 6U and 3U formats.
    The 6U is 234mm X 160mm and the 3U is 100mm X 160mm. The 3U mechanical
    format was then adopted by Compact PCI (and some others).

    As everything kept getting smaller some applications used a "Half
    Eurocard" format which should be 100mm X 80mm. However in looking for
    some cases to fit this board size I ran across several SBC's that were
    "Half Eurocard" but were 100mm X 71mm. Other boards use Half Eurocard
    to mean 100mm X 80mm. I'm very curious as to why?

    I was under the impression that all the extension pieces for VME cards
    came in 60mm increments. So saying a half Eurocard was 100mm X 100mm
    would make more sense (at least to me) but a 9mm discrepency seems odd.

    In any case, I did not find any cases for either of these sizes. (lots
    of stuff slightly bigger and smaller but nothing that you would just be
    able to drop a board into.)

    Thanks for helping settle my curiosity.

    Kevin

    ***************************************************************

    Kevin C. Castner
    kccnospam at glenevin dot com

    "Good ideas are not adopted automatically.
    They must be driven into practice with courageous patience."
    -- Adm. Hyman Rickover, USN
    ****************************************************************
     
  2. Kryten

    Kryten Guest

    Well, their manufacturers are wrong then.
    It is not a half Eurocard.
    Because they are right. That _is_ half a Eurocard.
    That would be a 5/8ths Eurocard, but it is more practically known as a
    square Eurocard. It is a legitimate Eurocard size, but not widely used.

    It is a shame the PC104 standard did not chose this size, as gives a bit
    more room for I/O connectors and fits in Euroracks.
    Just how many manufacturers use that size?
    If more than a few, there may be a good reason.
    Well, Fischer (German, very good) and Hammond (Canadian, almost as good)
    make aluminium extrusions for 100 mm cards to slot into. Usually comes in
    160/220 mm lengths but if you want more than a few I'm sure they will sell
    you it in any length you want. If you just one a few then any light machine
    shop with a mechanical saw could cut it down to the size you want.

    Don't forget that the PCB may be 80, 100, 120, 160, 220 mm but you may need
    to allow a few mm for connector overhang. I've seen Eurocard cases 5 mm
    bigger than Eurocard sizes to allow clearance front and back.
     
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