David:
Our cam dept prefers the customer give us the bumped up soldermask rather
than 1:1 because they already are burdened with a lot of other design
checks. It seems like the fabricators are taking in a lot more design
issues/responsibilities in the name of helping out the customers. Also one
less step for cam to do hopefully speeding their work especially quick
turns.
Sona
----- Original Message -----
From: "David Hoover" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, November 07, 2003 10:48 AM
Subject: Re: [TN] Soldermask Clearance Question
> Sona,
>
> I guess I wrote the question wrong. I wasn't really interested in your
> capabilities. I was curious as to what your CAM dept preference
> would be. Would you rather get the soldermask features 1:1 and
> let your CAM operators modify to achieve an acceptable product
> or would you rather get your designs coming in the door with
> soldermask features preset (larger some value) than your pad sizes.
>
> I was asked by a CM who designs for many fabricators what
> would be the proper way to do the design. My belief is 1:1 and
> let "us" (fabricators) modify to meet our process. However I have
> others in my staff that believe we should dictate a value coming
> in (it'd be changed anyways).
>
> Regards,
>
> David Hoover (aka. Groovy)
>
> ----- Original Message -----
> From: "Fineline Circuits, Inc." <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, November 05, 2003 8:51 AM
> Subject: Re: [TN] Soldermask Clearance Question
>
>
> > David:
> >
> > For standard technology and screened soldermask we prefer a soldermask
> > clearance of .008mls
> > For higher technology pcb's and liquid photoimageable mask we prefer a
> mask
> > clearance of .004mls although tighter clearances are achieved..
> > A 1:1 will bleed mask on pads and or in the holes.
> > These are general guidelines. Our CAM dept. generally check the design
out
> > for soldemask clearances making sure no adjacent traces/pads are exposed
> > depending upon the thickness of the pcb and soldermask.
> >
> > Sona Sitapara
> > Fineline Circuits Inc.
> >
> >
> >
> > > David Hoover wrote:
> > > > I am in the middle of a discussion/debate with assemblers on one
side
> > and
> > > > designers on the other.
> > > >
> > > > The question is:
> > > > What would your shop prefer to receive from the designer for
> soldermask
> > > > features?
> > > >
> > > > either
> > > > A) 1:1? (Soldermask clearance same as the holesize, padsize,
> > > > surfacemount, or
> > > > clearanced feature size)
> > > > or
> > > > B) Soldermask Clearance set at some value over the pad/feature/SMT
siz
> e?
> > > > (Like 3 mils per side)
> > > >
> > > > Thanks for any and all responses,
> > > >
> > > > David Hoover
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