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1mm pins -- through-hole or SMT?

Discussion in 'Electronic Design' started by [email protected], Oct 22, 2007.

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  1. Guest

    The company I work for will not be going to SMT until 2008, believe it
    or not. In trying to track down a through-hole version of an SO-
    DIMM-200 connector, I found one at
    http://www.adexelec.com/connectors.htm

    called "CONN-DDR-SOD-200-STD" with the description "DDR SO DIMM, 200
    pins, through hole". However, I requested the data sheet, which you
    can view here:
    http://www.michaelmalak.com/conn-ddr-sod-200-std.pdf

    and it says that the pins are only 1mm long. Since most PCBs are at
    least 1.6mm, how does this work? Are these parts really intended for
    some kind of hybrid SMT/through-hole process whereby the short pins
    allow for reflow soldering? Can these parts be used in a pure through-
    hole process?
     
  2. Sure looks like an SMT part to me.


    Best regards,
    Spehro Pefhany
     
  3. Guest

    Can SMT parts have vertical pins on the bottom?
     
  4. I see two locating pins (non electrical) and solder tabs to hold it
    mechanically. The memory card is held parallel to, and a few mm above,
    the PCB.

    Best regards,
    Spehro Pefhany
     
  5. Guest

    I assumed from the diagram in the lower-left corner that the bottom
    1mm -- consisting of the 200 pins (1mm height at 0.6mm spacing) and
    two pieces of plastic approx. 3 mm wide each on the ends -- would be
    below the top surface of the PCB, and everything else would be above
    it.

    This part is a socket/carrier for a memory card, so of course the
    memory card itself would be held a few mm above the PCB -- namely at
    the dense array of contacts shown in the middle of that same diagram
    in the lower-left corner.

    I'm not sure what the label "solder tab" means in the bottom middle
    diagram -- I'm guessing maybe it's an extra grounding point.

    If my assumption is correct about the pins intruding into the top of
    the PCB a distance of 1mm, then I'm wondering if this part can be used
    in a 1.6mm-thick through-hole PCB.
     
  6. Rich Grise

    Rich Grise Guest

    No, unless you cut rectangular holes for those foot-like projections
    on the ears. The pins would just touch the pads, and your solder paste
    would make nice little trumpet-shaped fillets. :)

    Cheers!
    Rich
     
  7. There are two rows of 100 pins, not one row of 200 pins. Look at the
    A-A cross-section detail
    ....and PARALLEL to it.
    ...tt is not
    It can be a meter thick if you like.

    Best regards,
    Spehro Pefhany
     
  8. Ben Jackson

    Ben Jackson Guest

    I don't know if such a thing is even available, but you might do better
    with the keyword "press-fit" instead of through-hole. That's common on
    high-density leaded sockets like that.
     
  9. Guest

    The answer from adexelec.com is that it was mislabeled as a through-
    hole part. It is really a surface mount part.
     
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