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The Print did not specify SMOBC. But it also didn't specify SOS (Soldermask
over solder) either! The implication is that the order of the notes IMPLIES
that we want soldermask after the solder coating process. Don't all PCB vendors
know that the solder under the soldermask will reflow, wrinkle and damage
the soldermask in assembly? If we have soldermask on a thru hole technology
board.... we are going to wave solder the board. Why would a vendor interpret
the drawing in such a way as to compromise the performance of the board?
I can't believe this is still happening in 2002.
I thought we learned our lesson back in 1980.....the first time I ever saw
anyone DO that...
Doesn't IPC have a spec that tells us not to do it that way?
Bill Brooks
Hi Bill!
Was that called out on the fab drawing? I've ran across a few boards here
that still call that out on the drawing, and TRY and get that changed before
the boards are fabbed...most of the time I've been lucky, but there's been
a few that slipped by me.
Bottomline, if it's called out on the drawing, you don't have much recourse...
-Steve Gregory-
Anyone aware of a spec that sets the accept/reject criteria for boards
that
come in with solder UNDER the soldermask? Is this actually done as a
legitimate practice? WHY would a vendor make the boards this way? Shouldn't
we be making all boards to be SMOBC when there is a soldermask?
Bill Brooks
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