Hi Genny!
Pictures are posted:
http://stevezeva.homestead.com/files/copperballs.pdf
http://stevezeva.homestead.com/files/copperballs2.pdf
Sure looks a lot like what Bob Willis showed...
Steve
-----Original Message-----
From: Genny Gibbard [mailto:[log in to unmask]]
Sent: Thursday, September 18, 2008 10:23 AM
To: TechNet E-Mail Forum
Cc: Steve Gregory
Subject: RE: [TN] Copper BGA balls
We are in the process of contacting the manufacturer, but thought I would see what technetters have to say.
Steve, can you post a couple of pics? These are X-Rays of the parts right off the reel, before any assembly/reflow.
I'd say it looks like voids but...
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: September 18, 2008 7:32 AM
To: [log in to unmask]
Subject: Re: [TN] Copper BGA balls
I would second Richard, I don't believe the Cu balls are formed the same way as solder, so it would be impossible they contain voids. Could you check with the manufacturer if the ball forming is prone to voiding?
Ioan
-----Message d'origine-----
De : Stadem, Richard D. [mailto:[log in to unmask]]
Envoyé : 18 septembre 2008 09:12
À : [log in to unmask]
Objet : Re: [TN] Copper BGA balls
On those types of components, the copper ball shows up like a void. If you have a good X-ray and you turn up the magnification, the "void" is actually a light shade of gray, but not as white as a real void.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: Wednesday, September 17, 2008 6:01 PM
To: [log in to unmask]
Subject: [TN] Copper BGA balls
Anyone have experience with components using a tinned copper ball instead of a SAC alloy solder ball?
Have you ever X-rayed one?
We are seeing voiding that does not meet the IPC-7095B spec for incoming inspection with a transmission x-ray. However, we don't know if this is a concern for this type of ball, or if this spec even applies to this type of ball. I don't think these are meant to collapse and mix with the solder on the board, like a normal solder alloy ball might.
Once again, thanks in advance for sharing your knowledge.
Genny
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