Karla,
Talk to your wave soldering machine manufacturer.  Several have
turbulent solder waves that should reduce your problem considerably.

Bev Christian
Nortel

>----------
>From:  KARLA DUGGAN[SMTP:[log in to unmask]]
>Sent:  Wednesday, November 12, 1997 11:00 AM
>To:    [log in to unmask]
>Subject:       [TN] SOT23 problems
>
>We are currently having problems soldering SOT23 parts on
>the bottom side of a board.  We glue the bottom side surface
>mount components and then run through the reflow oven to
>cure the glue.  We then run the boards through the wave
>using both a chip and lambda wave.
>
>All the SMT components solder except the SOT23.  The
>SOT23 is randomly soldered.  Sometimes 2 leads,
>sometimes 1 lead, sometimes all leads, sometimes no
>leads.  The shadowing can be accounted for but not all the
>missing solder is due to shadowing.
>
>Has anyone experienced such problems.
>
>Any help is greatly appreciated,
>Karla Duggan
>APACTS
>
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