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Subject:	C4 attach to organic laminate material
From:	"Thayer, Wayne" <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Thayer, Wayne
Date:	Tue, 27 Jan 2009 10:26:21 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (24 lines)

I've been provided with a C4 bumped die, peripheral contact pads, 200 micron pitch, and the alloy is Sn5Pb95 (classic C4, melting point approx 290C). Someone suggested attaching this to a BGA carrier substrate (core with low elastic modulus SLC layers to absorb the CTE mismatch) using Sn63 solder paste. Tough printing job, but possible. However, I don't believe we can get this laminate material up to 290C, so the alloy mix will be incomplete, meaning a likely brittle zone in the attach.

Only thought I have is using LTCC or HTCC instead of the organic laminate.

Any other ideas out there? Anyone do reliability studies with this type of attach? Any input would be appreciated!

Wayne Thayer

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