From: szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983)
Subject: Re: High Density PCB Connectors
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL6]
Date: Tue, 12 Jan 93 07:56:14 GMT

Randy Casciola (rwc@ius4.ius.cs.cmu.edu) wrote:
: 
: Folks,
: 
: I am looking for high density board stacking connectors.
: All of my boards will be identical and be about 2.5 inches
: square.  The idea is to pass the control, data, and address
: busses from one board to the next, indefinitely (at least
: from a mechanical standpoint).  Two possible ways of doing
: this are:
: 
: 1.  Using through-hole technology, where the pins from the
:     receptacle on the top of the board go through the holes 
:     in the board and are soldered to the bottom; the pins
:     continue and are used to mate with the receptacle on the
:     top of the next board.  And so on.  Kind of like the 
:     picture below (Side View).
: 
:                            _____
:     ____BOARD______________|___|_<-- HEADER 
:                             | |
:                             | | <-- PINS  
:                            _____
:     _______________________|___|_
:                             | |
:                             | |   
: 
: 2.  Doing a similar thing, but with surface mount where an
:     SMT receptacle is on the top, and an SMT header on the
:     bottom, and connections are made through the board using
:     vias.
: 
:                     ______
:     ________________|____|_
:                      |__|
:                     ______
:     ________________|____|_
:                      |__|
: 
: The problem with the first method is that I need two rows of 
: 40 pins/row.  Since the connector has to be less than 2.5 inches 
: wide, I need .050" pins and I haven't seen anything designed to
: be stacked like this with .050" centers.
: 
: The problem with the second is that I need twice as many connectors,
: and allignment problems may crop up.  I found some parts from
: Samtec that I could use, but they don't provide enough space between
: boards.
: 
: So, if anyone knows of a connector I can use, or a company that I
: could call to get a catalog, I would appreciate hearing from you.
: Or, if you have a better idea altogether of how to stack these I would
: like to hear it.  It doesn't matter whether you post to this group, or
: mail me at randy@cmu.edu  
: 
: I already have catalogs from:
: 
: Samtec
: Aries
: Mil-Max Preci Dip
: Hirose
: Robinson Nugent
: Hypertronics
: 




Randy-


Did you try AMP or ITT-Canon?  AMP is the largest manufacturer of connectors
in the world, if they don't make what you're looking for noone does.  ITT-
Canon isn't as big but they do make a wide range of connectors that are 
usually used as a second-source to AMP for military purchasing.  I've also 
used Hypertronics before and I'm surprised that they don't have what you're
lookig for(I worked on a project that sounds similar in dimentions to yours
where we piggy-backed five boards together using Hypertronics multi-pin,
high-density connectors).

I hope this helps you.


Jerry


"It riles them to believe that you perceive the web they weave and keep on
thinking free!"  --  Moody Blues



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