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November 2006

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Subject:
From:
Vladimir Igoshev <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Vladimir Igoshev <[log in to unmask]>
Date:
Tue, 28 Nov 2006 14:13:33 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (174 lines)
Hi Gaby,

If it's a true case of Black Pad failure, then a simple cross-section
will confirm it. Neither the type of solder, nor the component finish
has anything to do with the failure. The root cause is in the plating
process.

One should keep in mind, though that VERY often Black Pad is confused
with Brittle Fracture, which is a completely different phenomenon.
Brittle Fracture doers occur more often/easier with Pb-free solders.

Regards,

Vladimir

AMD 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gabriela Bogdan
Sent: Tuesday, November 28, 2006 1:52 PM
To: [log in to unmask]
Subject: Re: [TN] Ultimate PCB assembly books (and more)

Just wanted you all to know that this book can be dowloaded on
E-mule.....
It is really great, sorry for the author...
And a question:
Did anyone encounter black pad failure on LF MicroBGA's solderd with LF
solder paste and with a profile according to the manufacturer's
indication?
We had such an occurrence and it was batch related. If yes, did you
involve
the component manufacturer in this failure?
How did you prove that it is not a failure due to your process?
Is it true that the failures due to black pad or others related to ENIG
are
more frequent with LF?
Gaby
----- Original Message -----
From: "Christopher Nash" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, November 27, 2006 11:29 PM
Subject: Re: [TN] Ultimate PCB assembly books


> Ioan, The one book that I felt helped me out more than any other was
> "Reflow
> Soldering Processes and Troubleshooting"  by Dr. Ning-Cheng Lee.  It
may
> not
> have what you are looking for as far as lead-free but it is a good
Basic
> book that explains soldering in plain English.
>
> Christopher Nash
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
> Sent: Monday, November 27, 2006 3:15 PM
> To: [log in to unmask]
> Subject: [TN] Ultimate PCB assembly books
>
> Hi Technos,
>
> I know this has already been discussed on TN, but times are a changin'
and
> you never know what gems have been published lately.
>
> Except for Wassink which I have (12.50$ on e-Bay, lucky me), what
would be
> the ultimate books for PCB Assembly? Should it be Hwang or Prasad, or
what
> else? I mean books that lay the fundamentals of SMT and TH, books that
I
> could use to teach laymen what electronics assembly is. Besides that,
what
> would be the ultimate book that adds lead-free on top of the basics?
>
> Thanks,
>
> Ioan
>
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