Normally, when dicing die, PWB's, and such, we would use a [warm] water
soluble wax to bond the board to a sacrificial glass plate. The
alternative, cleaner, approach is to use conventional dicing [eg - Nitto]
tapes, if the board topography allows. The dicing operation is performed
using water for cooling and lubrication of the blade, as well as debris
removal.
If the water is ultra-pure, this leads to aluminum bonding pad corrosion [on
IC's], so it is doped a bit to make it slightly conductive.
The actual dicing operation itself would appear to be quite ESD-benign.
Those operations leading up to, or after should be carefully looked at as
well.
I wonder it an eximer or UV laser was used for the singulation?
Steve C
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Tuesday, December 31, 2013 11:21 AM
To: [log in to unmask]
Subject: Re: [TN] super fine score cuts
A dicing saw sounds like a good idea, but be sure it is grounded; consider
the potential ESD aspect (FMEA).
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ahmad, Syed
Sent: Tuesday, December 31, 2013 8:52 AM
To: [log in to unmask]
Subject: Re: [TN] super fine score cuts
At our center, we regularly use the dicing saw to cut all kind of materials
including flex and rigid boards. Dicing blade suppliers supply appropriate
blades to cut from a plastic sheet to a sapphire wafer. Our own initiative
and our customers have challenged us in many ways over the years.
Syed Sajid Ahmad, Manager of Engineering Services Center for Nanoscale
Science and Engineering (CNSE) NORTH DAKOTA STATE UNIVERSITY Research 2,
1805 NDSU Research Park, Fargo ND 58102 Phone 701 231 5880 Fax 701 231 5306
www.ndsu.edu/cnse
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer
Sent: Tuesday, December 31, 2013 8:42 AM
To: [log in to unmask]
Subject: Re: [TN] super fine score cuts
If one side is flat, it should be pretty simple to get it done on a
semiconductor dicing saw. This will minimize stress to the components, and
a typical kerf is less than 0.01". They use visual targeting. Service
houses are available for doing this work.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Tuesday, December 31, 2013 8:57 AM
To: [log in to unmask]
Subject: Re: [TN] super fine score cuts
Use a Fiskars rolling paper cutter, like this one. Do not use the fixed
blade unit, as it will tear the PWB:
http://www.messageinafold.com/trimmers.htm#rotarytrimmer
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
Sent: Tuesday, December 31, 2013 7:31 AM
To: [log in to unmask]
Subject: [TN] super fine score cuts
Hi Steve,
We have a 3 inch square panel of 144 little boards. They have the finest
little score cuts I have ever seen.
Each one has a tiny embedded device. I am afraid to break them apart.
Wondering if you can post the pictures, and if you or anyone on Technet has
a good idea for how to singlulate the boards.
Thanks,
Guy
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