Check the IPC 001 hdbk, section ~8.3 good discussion of ROSE testing
including limitations.

J-std-001 indicates that the limit is 10 micrograms / sq inch but that
value  relates to a manual test method.  You may be able to argue that
14 micrograms is the true specification when dealing with an automated
ROSE test system.  (see the IPC 001 hdbk).

I don't think that you can obtain any positive or negative consideration
whether you dealing with a Sn/Pb or Pb-free assembly.  You still can
compromise the circuit with ionics.  

Rich K / KEJ


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Todd, Richard
Sent: Tuesday, April 15, 2008 10:50 AM
To: [log in to unmask]
Subject: [TN] Ionic Contamination Question

Technet,

I am receiving questions about the allowable limits of ionic
contamination on our finished assemblies.  I believe that J-STD-001D
indicates that the allowable limit is 1.5 ug/cm2.  Is this the same for
both leaded and lead-free assemblies?  Is there any other specification
that details what the maximum acceptable limits for ionic contamination
should be for finished assemblies?

My customer won't take my word for it; I must provide
industry-recognized evidence.

Thank you in advance.

Regards,

Rick Todd
Senior Engineer
Panasonic Automotive Systems


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