Note that the latest rev. of IPC-SM-840 (Rev C) does not list Class 1, 2, or
3, but lists Class H and Class T soldermasks. Class H corresponds to Class
3.
Tim Reeves
|-----Original Message-----
|From: Ian Hanna [mailto:[log in to unmask]]
|Sent: Tuesday, October 31, 2000 6:35 AM
|Subject: Re: Plugging (not tenting) of via fab notes
|
|
|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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