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April 2008

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Subject:
From:
Richard Kraszewski <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Richard Kraszewski <[log in to unmask]>
Date:
Tue, 15 Apr 2008 17:15:26 -0400
Content-Type:
text/plain
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text/plain (105 lines)
BTW - Remember you report an average value with ROSE testing

Not really known whether this X# of micrograms is under a BGA or a large ground area that poses little risk. 

So the saying "well it depends" seems almost totally appropriate here. 

Rich K / Kimball.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hfjord
Sent: Tuesday, April 15, 2008 2:19 PM
To: [log in to unmask]
Subject: [TN] SV: [TN] Ionic Contamination Question

Do you all really believe in ug/cm2 ?  The limits are said to be arbitrarily
set. Uhhh..I'll get the whole academic world upset. 
/Inge

-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Brian Ellis
Skickat: den 15 april 2008 17:35
Till: [log in to unmask]
Ämne: Re: [TN] Ionic Contamination Question

If you look through all the Technet archives, you may find an answer, 
but the two answers you will certainly find on this subject are:
"It depends!"
"How long is a piece of string?"

I apologise if you think it unhelpful, but this is the best I can do.

Brian

Todd, Richard wrote:
> 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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