If the wire terminations can be lap-soldered to electrical pads,
additional non-electrical pads can be used to solder wire constraints at
the end of the board that will provide routing guides and still provide
strain relief. Think ferrules similar to what is on your fishing rod,
but much smaller. You can fill them with epoxy if necessary.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lenny Carter
Sent: Wednesday, June 27, 2007 4:50 PM
To: [log in to unmask]
Subject: [TN] soldering wires to SMT pads

We have a pcb that is powered through a harness and the bottom of the
pcb must be perfectly flat with no 'lead-protrusions" so we are
soldering harness wires into blind holes.  the pcbs are very expensive
and difficult to make.
we wonder about soldering harness wires directly to SMT pads on top of
the pcb?  What pad designs?  and a big concern over strain relieving the
harness by attaching it to the pcb, but have really no room on the end
of the pcb for other than dots of adhesive, etc...
Can anyone point me in the right direction for information?
Thanks,
Lenny Carter
Design Engineer
ERG, Inc.


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