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February 2005

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Subject:
From:
"Ingemar Hernefjord (KC/EMW)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ingemar Hernefjord (KC/EMW)
Date:
Thu, 17 Feb 2005 09:05:39 +0100
Content-Type:
text/plain
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text/plain (60 lines)
It struck me that I never sent pics on 'normal' IMC layer to Steve's gallery as promised.
In case someone is still interested, I'll send photos to the Master again. Thanks.
Ingemar

-----Original Message-----
From: Ingemar Hernefjord (KC/EMW)
Sent: den 2 februari 2005 08:57
To: 'TechNet E-Mail Forum'; 'Zweigart, Siegmund'
Subject: RE: [TN] ENIG - Failures


Interesting. Why just few nanometers? We found that 0.5 to 1.5 um seemed to be quite normal.
I'll ask Mountain Jack to hang a skin on the wall. Not perfect a pic, but quite readable. In
this case, Xilinx helped me, their specialists are VERY skilled.
Ingemar Hernefjord
Ericsson Microwave Systems
PS. Steve, ready?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Zweigart, Siegmund
Sent: den 1 februari 2005 15:12
To: [log in to unmask]
Subject: [TN] ENIG - Failures


Hello all

We see the following issue on an ENIG coated PCB (soldered with SnPb):
After reflow solder joint is ok but cross section shows a quite irregular
IMC phase (about 3 mikrometer thick, not homogenous, looks more like stones
on a plane)
After the following wave process (component is on the top side) solder joint
is very fragile and in the cross section some fractures are seen.
Has somebody any picture how a perfect IMC on ENIG should look like? I would
expect a homogeous layer just a few nm thick.

Any ideas?

Siggi

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