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Subject:	Re: Floating SMT components?
From:	"Mullet, LaVern" <[log in to unmask]>
Reply To:	(Designers Council Forum)
Date:	Fri, 18 Mar 2005 09:14:24 -0800
Content-Type:	text/plain
Parts/Attachments:	text/plain (52 lines)

We build our Surface Mount footprints with a standard 10mil "solder float" added onto the max component height to cover this issue.

LaVern
--- 
LaVern Mullet, C.I.D.
PCB Design Supervisor
Medtronic Emergency Response Systems



-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]]On Behalf Of Jack
C. Olson
Sent: Friday, March 18, 2005 9:09 AM
To: [log in to unmask]
Subject: [DC] Floating SMT components?


I have been asked a question that I've never read anything about before, so
I'm hoping someone will know this...

We have a mechanical engineer who is trying to predict the distance between
boards after soldering SMT board-to-board connectors. We know the connector
mating height, but the question is:

"If the connector is sitting in solder-paste, how high will it stay above
the surface of the board?"

Common sense tells me the connector will not be flush to the surface, there
will be some solder under there, and I think we are using 6mil paste
screens. Has anyone had to document something like this before?

Jack

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