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June 2007

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Subject:
From:
Paul Edwards <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Paul Edwards <[log in to unmask]>
Date:
Fri, 29 Jun 2007 10:17:44 -0700
Content-Type:
text/plain
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text/plain (117 lines)
I agree in principle with Dewey...

We do reflow-shear testing to determine acceptability of PCBs....  This
technique captures both the as-manufactured condition of the PCB and
design issues as they relate to the solder joint strength...It provides
a relatively direct measure of the ratio of the strength of the solder
joint to the bulk solder strength which is the measure of a good bonded
joint...

A solder and pull has too many additional variables to separate from the
joint shear data and the process typically does not stress the joint in
the same way as BGA ball failures occur...  


Paul Edwards
Process/Quality Engineering
[log in to unmask]
Tel: 408-433-4700
FAX: 408-433-9988
Surface Art Engineering
81Bonaventura Dr.
San Jose, CA 95134
DUNS: 944740570
CAGE/NCAGE: 1XZ48

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
(EHCOE)
Sent: Friday, June 29, 2007 9:47 AM
To: [log in to unmask]
Subject: [TN]

Part of me wants to say that is shear lunacy.
 I would suggest reflowing solder balls to the pads and due a pull/shear
test. There are several test reports and Equipment people that could
help you with this. The goal would be to have a cohesive failure of the
solder ball. All that does is establish, regardless of the undefined
anomaly, that an acceptable adhesion can be attained at the ball/pad
interface.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Kelly
Sent: Friday, June 29, 2007 7:42 AM
To: [log in to unmask]
Subject: [TN]

Good Morning to All,

I have a customer who has asked me to do an on-going test for black pad.
The
test would require me to solder wires onto 624 BGA pads and then pull on
the
wires to determine if there is black pad . They have given me no
criteria in
terms of pull strength or what constitutes pass/fail. I obviously need
some
kind of pull tester to do this. Has anyone done anything similar? Any
thoughts or ideas would be appreciated. Regards Steve Kelly

 

Steve Kelly

(416) 750-8433 (work)

(416) 750-0016 (fax)

(416) 577-8433 (cell)

 


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