The note makes perfect sense from a fabrication point of view.  I would also
note which side to be plugged as you mentioned.  You should supply a
'via-plug' artwork (gerber layer) as the fab shop will have no clue as to
which are 'test-vias'.    The associated pads note is also clear and makes
sense.  You may want to consider making the pads for the test vias a
slightly different size than the others, this will further emphasize the
difference to the fab-house in their front-end tooling.

Regards,

Ian Hanna
Quality Manager
Lazer-Tech Ltd.
Voice: 416.291.7727.233
FAX:   416.291.0325
[log in to unmask]


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Franklin D Asbell
Sent: Monday, October 30, 2000 6:36 PM
To: [log in to unmask]
Subject: Re: [TN] Plugging (not tenting) of via fab notes

It's a little confusing...but then I'm not the expert.

In regards to exposed vias...the artwork will dictate what vias are to
be exposed and/or plugged so the mention of that in the notes may
confuse the issue. Stating Green LPI IAW SM-840 should be enough in most
cases I would suspect. Your comment on 'associated vias'...what exactly
are 'associated vias? Is this all vias on a commen net?

Hope the critique helps some.

Franklin



Ken Patel wrote:
>
>         Fab Expert,
>         Is the following fab note make sense to you or should I also
mention
> the plugging side as I do not want higher surface on fine-pitch side.
Also,
> comment on use of SR1000 epoxy in my fab note.
>
>         SOLDERMASK: GREEN PHOTOIMAGEABLE, BOTH SIDES PER IPC-SM-840, CLASS
> 3. ALL TEST-VIAS AND ASSOCIATED PADS ARE TO BE FREE OF SOLDERMASK. ALL
> NON-TEST VIA HOLES TO BE PLUGGED WITH SR1000 OR EQUIVALENT EPOXY.
>
> re,
> ken patel
>
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