[PCB_FORUM] Re: paste pad on fiducial

The solder paste on the global fiducials is only used to create an
opening used for stencil alignment and the stencil openings are only on
the global fiducials. All other fiducials do not get the stencil
openings. And I agree that the assembly house does not actually paste /
reflow these global fiducials.

Tony Cosentino
Tekelec

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Mike Finczak
Sent: Monday, May 21, 2007 7:39 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: paste pad on fiducial

Ed and Robert,
        
        We code our fiducials with solder paste so that our DFM software
        does not flag them as errors. All surface mount pads are checked
        to make sure that they have a solder mask opening, and a solder
        paste pad. However, I took a look at some assembled boards and 
        noticed that the fiducials do not have any solder paste on them.
        
        This may be a case where two different requirements conflict, 
        and the people making the solder paste stencils quietly change
        them.

Regards,
       Mike Finczak
       CopperCAD Design
       www.CopperCAD.com
       905-488-8958


-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Robert
Szumowicz
Sent: Monday, May 21, 2007 2:58 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: paste pad on fiducial


Below there is a link to SMEA Fiducial Mark Standard, which does not
advice the solder paste on fiducials although different assembly houses
may have different requirements (we use a cross shape covered by ENIG). 
In the past we had fiducials with the paste on  them and we were asked
to change it.

www.smema.org/smema3.1.pdf

cheers,
Robert

Ed Caldwell wrote:
>
> I can't remember why paste pads are on fiducials... can anyone help 
> me.
>
> Thanks,
> Ed

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