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May 2007

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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Mon, 7 May 2007 11:16:01 -0500
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Hi, Phil
Like any other design change, something like this should be qualified to
ensure it is not going to be an issue.
I have been using D-subs in SMT designs for military hardware, and have
not seen any major issues. The D-subs we use have a bifurcated alignment
post that snaps into the board and is soldered by depositing a small
amount of paste on the annular ring. This provides mechanical strength
so the connector can withstand the mating/demating forces. The ribbon
connectors may be more of an issue, as they usually require more force
to mate, depending on the number of pins. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Monday, May 07, 2007 11:05 AM
To: [log in to unmask]
Subject: [TN] SMT connectors

Hi Techies,

What choices have you made regarding SMT connectors?

We are designing some new SMT boards and could put SMT connectors on to
reduce or eliminate a wave or hand solder step.  I am looking at
D-subminiature connectors and 0.100 on center ribbon connectors.  Each
are available in SMT.  My concern is that the SMT is less durable in a
high usage or high vibration/shock environment.  Saving a step isn't
worth it if it created more long term failures.

Thanks in advance.

Phil

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