[PCB_FORUM] Re: pastemask reliefs over shapes
- From: "Gene Carman" <gcarman@xxxxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Fri, 27 May 2005 10:14:04 -0700
The pins idea gets real old when you have a chip with a large slug in the
center and you really need a bunch of small shapes to control the amount of
solder paste deposited in that area. If we add enough paste to totally cover
the entire slug, the chip will "float." So we use another subclass and add
hole patterns to lay down paste. Works very well.
-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx]On Behalf Of Dave Smyser
Sent: Friday, May 27, 2005 8:48 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: pastemask reliefs over shapes
Another recommendation would be to add pins in this area to function as
vias to make the internal plane connection, and then add a via keepout
area equal to the pastemask opening. A stray via in the pastemask area
will be shorted to the thermal shape through the solderpaste, and the DRC
check will not catch it.
Regards, David - dsmyser@xxxxxxxxxx
>
> We make a new subclass under Package Geometry to handle this issue.
> Either Pastemask_Top or Pastemask_Bottom as need be.
>
> westfeldt wrote:
>
> > How do people handle pastemask patterns over the csp thermal/mech shapes in
> > the middle of the chip?. Use existing subclass, make new subclass using
> > _top and _bottom?
> >
> > Patrick Westfeldt, Jr.
>
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