[PCB_FORUM] Re: Design For Assembly (DFA) Audits

Steve,
I never saw an answer in all the mess that came through recently
so here goes.
In talking to our assembler he likes at least 20 mils between
parts so I make the place outline 10 mils outside the largest
piece on the component. For bgas I put a 100 mil no place around
it to allow for rework. This allows me to set my comp to comp
drc to 0.
I suggest you just look through the DFM guide that the assembler
seems to have sent and try to derive rules that you can live with.
It is always a good idea to please the assembler. They can give you
back a better product if you do!

Good luck to you,
Kevin McCowan
Sr. PCB Designer
TSI Telsys


Mariani, Stephen wrote:

Is there anyone currently using the DFA tool? I would like to know if you would share some information with me on how you define your library components (placement boundary) and just how you exercise the tool itself. I have a document Performing DFA Audits but it isn't the easiest document to understand.

Thanks
Steve


Stephen Mariani
Mercury Computer Systems, Inc.
199 Riverneck Road
Chelmsford, MA 02194
Phone: (978) 967-1855
Fax: (978) 244-0520
_mailto:smariani@xxxxxxx




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