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May 2004

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Subject:
From:
Francois Monette <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 28 May 2004 08:55:29 -0400
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Hi Grant,

As some other suggested, a datalogger is a useful equipment but the bottom
line is that MSDs have a limited floor life, no matter what is the ambient
condition in your factory (Ref : J-STD-033A, Table 7-1).

The approach that you are using right now represents a significant overkill.
Systematic baking can actually be detrimental to your components due to the
lead oxidation and intermetallic growth that can result in solderability
problems. This is why the IPC/JEDEC standard specifies a maximum cumulative
bake time of 48 hours at 125C. The proper method defined by the industry
standard is to minimize exposure time and properly track your MSDs once they
are removed from their dry bags to insure that they are assembled within
their specified floor life.

There are automated MSD Control systems available that will accomplish
exactly what you require. Using barcode labels or RFID tags attached
directly to the trays and reels, feeding material movement to an expert
software system that will monitor the total exposure time of each batch of
MSDs throughout different environments, i.e. in and out of dry bags, dry
cabinets, bake ovens, placement machines, etc. The system automatically
applies all the rules and tables provided in J-STD-033A to calculate the
remaining floor life and to provide advance warnings and alarms in real
time.

All of the MSD transactions and process information can be stored in a
historical database to provide documented evidence that each MSD was
assembled within its specified floor life. This data can be tied to
serialized PCBs to provide complete MSD product traceability. The above
solution has been widely accepted by major OEM because you can actually
demonstrate full compliance with the industry standard.

Do not hesitate to contact me directly if you would like additional
information on this subject.

Best Regards,

Francois Monette
Cogiscan Inc.
Tel : 450-534-2644
Fax : 450-534-0092
[log in to unmask]
www.cogiscan.com


Date:    Thu, 27 May 2004 09:27:50 +0200
From:    Grant Emandien <[log in to unmask]>
Subject: Baking of MSD traceability - evidence thereof

Hi All,

Customers are getting more concerned with the need to bake components - some
even want all MSD material to be baked whether the humidity card indicates
otherwise ot not. We currently bake as requested however but it seems that
just baking for the required temp/time and logging in a register is not good
enough. Does anyone use a good traceable method which cannot be disputed by
customers e.g. time/temp stickers whch can placed in trays?

TIA
Grant

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