Jonathan,
The balls are already attached, this is a component as provided by the
vendor.
Your comments about reliability are what I am looking for, and I am
seeing the same thing that you describe - increased diffusion of the
ball at the SAC/Pb90Sn10 interface when compared to a Sn63Pb37/Pb90Sn10
interface.
The balls have not reached the point of collapsing, likely because we
subjected them only to a Pb reflow profile.
Ben
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of jonathan noquil
Sent: Tuesday, June 24, 2008 11:05 PM
To: [log in to unmask]
Subject: Re: [TN] SAC solder on Pb90Sn10
Hi Ben:
Why not use flux to attach the balls?
If you use solder it could alter somehow your ball diameter and ball
property since SAC solder is Sn rich and your ball is high lead. Pb will
react with Sn and gradually affect the solder joint property between
solderball and SAC solder (This is a reliability risk).
In the past we have tried this and our solder ball collapsed due to Sn
and Pb reaction, but since your BGA solder mask defined, maybe you can
maintain your ball height but i doubt if you can maintain ball
uniformity/planarity
regards
J.Noquil
Senior Member Technical Staff
CSD
On 6/25/08, Stadem, Richard D. <[log in to unmask]> wrote:
>
> Hi, Ben
> Good question. I checked with the Power PC data sheets
> http://ieeexplore.ieee.org/iel3/3906/11336/00514354.pdf?arnumber=51435
> 4 and they do not specify how they attach their 90/10 balls to the
> package, but I suspect some type of high-temp alloy is used. I do not
> believe they reflow the balls directly to the package pads. But I
> never did know what they use to solder the balls to the package with.
> Let me know if you find out.
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Gumpert, Ben
> Sent: Tuesday, June 24, 2008 12:42 PM
> To: [log in to unmask]
> Subject: [TN] SAC solder on Pb90Sn10
>
> Technetters,
>
> Does anyone have any experience (or heard of) using SAC solder to
> attach high-temp (Pb90Sn10) solder balls to a ceramic BGA?
>
> Ben
>
>
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