Hi Carl-

That's how SMT started! You don't want the caps on the bottom to be smaller
than 0603. Larger is preferred, but those will work. You put the parts down
in "SMT Adhesive", which is a high temperature low modulus material. This
holds the part in place while it goes through the wave. You want to be
careful about any parts going longitudinally through the wave because of
the large thermal transient during travel--design the caps so both ends hit
the wave at the same time, and you want to go through the wave relatively
slowly.

But even without that---Why solder 200+ pins instead of wave solder the
pins and place the caps manually? For that method you would deposit the
paste with a syringe and place the caps in the paste, then send through
reflow with the connectors on there. If the connectors can't take the heat,
then the caps must be reflowed using hot air rework station.

Wayne

On Mon, Mar 12, 2018 at 2:22 PM, Carl Van Wormer <[log in to unmask]
> wrote:

> Our new version PC board has a few bottom-side mounted capacitors that
> were not on our previous design.  Both designs are low-quantity builds of
> about 100 per year.  Our assembly house says they can’t run the board
> through their solder wave because of these parts and is planning to charge
> a significant fee to hand-solder the 200+ pins for the connectors.  I
> thought there was some sort of mask that could be placed over the bottom
> side parts, like the pink stuff they add to avoid filling the plated holes
> for mounting screws.  Are there any good methods that I should research to
> help them run our boards through the solder wave?
>
> Also, I tried to find the TechNet archive to search for answers, but I was
> unable to use the search function.  Is there a help file on searching the
> TechNet archive?
>
> Thanks,
> Carl
>
>
> ​​​​​
>
> Carl B. Van Wormer, P.E., AE7GD
> Senior Hardware Engineer
> Cipher Engineering LLC
>     21195 NW Evergreen Pkwy Ste 209
>     Hillsboro, OR  97124-7167
>     503-617-7447x303
>     [log in to unmask]<mailto:[log in to unmask]>
> http://cipherengineering.com<http://cipherengineering.com/>
>
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