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June 2007

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Subject:
From:
Kevin Glidden <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Kevin Glidden <[log in to unmask]>
Date:
Thu, 28 Jun 2007 07:46:54 -0400
Content-Type:
text/plain
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text/plain (66 lines)
If your wires are meant to run perpendicular to the surface (vs in the the
same plane as the PCB surface) then one thing you might consider is
soldering the wires to pads on the opposite side of the PCB you need the
wire on.  Then you can feed the wires through a hole in the PCB to the
opposite side.  There are a multitude of plastic grommets available that you
can place in the hole to aid in strain relief and also prevent chafing of
the wires.  The pass through allows you to leave a little service loop on
the opposite side, and you can further strain relief by covering the hole
and service loop with adhesive.  The 3145 is a good choice, but if you
cannot use silicon (a lot of applications cannot), then also consider
Loctite E-20.

If the wires are in the same plane as the PCB surface, simply place the
terminations in far enough to put a few wire tacks along the length of the
wire before the PCB edge.  Loctite Tak-Pak products work great for this
(instant hardening).

Kevin Glidden
Manufacturing Engineer
Luminescent Systems Inc.
 

-----Original Message-----
From: Lenny Carter [mailto:[log in to unmask]] 
Sent: Wednesday, June 27, 2007 5:50 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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