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October 1998

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Subject:
Re: SMT Assembly on Ceramic substrate?
From:
Enza Hill <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Wed, 28 Oct 1998 15:07:33 -0600
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Rick Thompson wrote:
>
> Hi,
>
> One of our customers has asked us to look at assembling smt components on
> ceramic substrate for them.  This is a process that we have no experience
> with. If anyone can offer information regarding this process, things to
> watch for, etc. it would be greatly appreciated.
>
> TIA
>
>                 Rick Thompson
>                 Ventura Electronics Assembly
>                 2665A Park Center Dr.
>                 Simi Valley, CA 93065
>
>             [log in to unmask]
>
>                 (805) 584-9858 voice
>                 (805) 584-1529 fax
>
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Hi Rick!

Just some thoughts from the equipment aspect...

- Fiducial recognition on some machines may be a problem because there
is not high contrast between the white ceramic and the metal fiducial.
- Depending on the quantities you need to run, if the substrates are run
directly on machine rails, you might see some premature wear on aluminum
rails.  Boards can be fixtured.
- Regarding rail conveyance...what is paste and part clearance on the
edge of the boards?  Will the way your machines convey and secure
substrates interfere with edge clearance?  (Might they chip, snap, or
crack the substrate?)  Again, boards can be fixtured to overcome this
problem.

Good luck!
Enza Hill

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