Agree with Chris. If you are doing flip chip attach, (line width and
spacing much narrow than normal application), you might need different spec.
As for class 2, it is environmental only... not include consideration of
line spacing and electrical field strength, which may also impact your ionic
migration path.
My 1.7 cents.
jk
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Schaefer, Chris
Sent: Thursday, August 10, 2006 12:42 PM
To: [log in to unmask]
Subject: Re: [TN] Ionic/Chloride contamination levels
Well Francis if you have customers then they may be a source of what is
considered clean or not. If not you can choose the standard IPC 10.06Mg or
come up with what you believe to be clean. Determine how clean is clean for
your business and go with it. We are considering changing ours once again,
but for some customers that want a very specific cleanliness level while
others basically state 'get it clean'. It depends on the type of customers
you have (military, aerospace, commercial, etc...). If you have hi-rel
customers than you need to get them really clean (relative of course), while
consumer stuff not so clean...
Just a few cents worth...
CAS
Chris Schaefer
Suntron Corporation
Process Engineer
540 N. Rogers Road
Olathe, Kansas 66062
913.393.5878
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Francis Sun
Sent: Thursday, August 10, 2006 11:11 AM
To: [log in to unmask]
Subject: [TN] Ionic/Chloride contamination levels
Hi Forum,
Can anyone tell me what is the general industry acceptance level for
chloride contamination on a assembled board for a class 2 product please.
I am getting conflicting statements from 2 evaluation labs.
One says 6.5ug/in2 is acceptable in the industry.
Another says 3ug/in2 is the industry standard or will/should be the
industry standard.
Is there an IPC committee looking at update the acceptable levels?
Thanks in advance for all inputs, opinions and facts
Regards;
Francis Sun
MARK IV Industries
(905) 624-3025 ext. 1235
Fax: (905) 624-4572
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