Hi Gaby!
 
Just got it up on my site now. I've been buried with my head in our VCD
all day pulling all the tooling out out to do an annual PM. But go to:
 
http://stevezeva.homestead.com/files/ImAG_from_2_vendors.doc
 
Steve

________________________________

From: Gabriela Bogdan [mailto:[log in to unmask]] 
Sent: Monday, February 04, 2008 1:55 PM
To: [log in to unmask]; [log in to unmask]; [log in to unmask];
Gabriela Bogdan; Lee parker
Cc: Steve Gregory; stephen gregory
Subject: Re: [TN] Microvoids immersion silver


Finished my "investigation". Attached word doc,  Steve, could you put it
on your site?
Can anybody comment or give an advice?
Thanks,
Gaby

	----- Original Message ----- 
	From: Gabriela Bogdan <mailto:[log in to unmask]>  
	To: [log in to unmask] ; [log in to unmask] 
	Sent: Tuesday, January 29, 2008 8:49 PM
	Subject: Re: [TN] Microvoids immersion silver

	Decided to investigate further to qualify our vendors.
	4BGA + 2 circuits and assembly.
	Will cross section bare, after paste+reflow, after BGA assembly
and also X-ray and dye and pry.
	At least I will have fun.
	Gaby

		----- Original Message ----- 
		From: [log in to unmask] 
		To: [log in to unmask] ; [log in to unmask] 
		Sent: Tuesday, January 29, 2008 8:35 PM
		Subject: Re: [TN] Microvoids immersion silver

		Hi Gaby,
		I take it what you are seeing are 'champagne voids.'
		Voids like these are 'encouraged by rough topography
copper, excessive Ag thickness, some solder paste choices and rapid
cool-down after reflow. But as Donald Cullen says in his comprehensive
paper, it "requires the "Perfect Storm" of a rather contrived
combination of parameters" to produce planar micro-voiding.
		Well Gaby, now you know it-you are "Perfect." ;-)
		
		
		
		Werner
		
		
		
		**************
		Start the year off right. Easy ways to stay in shape.
	
http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489 


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