Mark, I have done many single sided boards. They are routine for Power
Supply, and Consumer electronic devices... CEM1 or CEM 3 would probably be
the choice for material in a high volume application, where punching or
blanking was the method for trimming the boards out of the panel. If not,
you can still use FR4 material single sided.... The design challenge for
this board would be in manufacturing, the surface mount components would
need to be able to go through the wave solder process and be on the farside
of the board on the same side that you would wavesolder the thru hole
components. This would mean glue dots for the surface mount parts and would
restrict the size of the parts you could use that were surface mount. Most
discrete components that are surface mountable are capable of surviving the
solder wave process. Pad sizes for the surface mount parts will need to be
larger and you will need to pay close attention to component orientation
relative to the direction that the board will encounter the wave. Otherwise
there will be touchup needed due to shadowing of the parts through the wave
solder where they don't make good solder joints. (This, of course, adds
touch labor to the part which adds cost to the manufacturing process...) It
is 'do-able' though....

Hope that helps your decision making process a little...


Bill Brooks
Senior PCB Designer - [log in to unmask] <mailto:[log in to unmask]>

Zoneworx, Inc.
40925 County Center Drive, STE 200
Temecula, CA 92591
http://www.zoneworx.com    <http://www.zoneworx.com>
Tel: (909) 296-1226 x 1037
Co-Director / Education Officer / Webmaster
for the San Diego Chapter of the IPC Designers Council
http://www.ipc.org/SanDiego/index.html
<http://www.ipc.org/SanDiego/index.html>







-----Original Message-----
From: Mark Mainland [mailto:[log in to unmask]]
Sent: Wednesday, July 26, 2000 3:47 PM
To: [log in to unmask]
Subject: [DC]


A customer of mine wants a design done with a single
side board (copper on one side). This design has both
SMT and PTH parts, The SMT parts can't fit on the bottom
side with the PTH pads, I guess I don't feel right about
putting PTH parts on the same side as the pads? Has anyone
ever did that? Thanks for any input.

Mark