Ah Joyce - you will start a discussion on what caliber.......8-)
John Burke
(408) 515 4992
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Friday, July 31, 2009 10:06 AM
To: [log in to unmask]
Subject: Re: [TN] AW: [TN] AW: [TN] FORMULA FOR DETERMINING GOLD PERCENTAGE
IN A SOLDER JOINT
Who ever made doc and approved it should get shot at... seriously. Not a
Friday joke.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeremias, Michael
Sent: Friday, July 31, 2009 12:17 PM
To: [log in to unmask]
Subject: [TN] AW: [TN] AW: [TN] FORMULA FOR DETERMINING GOLD PERCENTAGE IN A
SOLDER JOINT
Unfortunately it is not (!) a typo from me . The document DIN EN 61191-1
contains this value 2,5 µm . But I am not confident, that this is low
enough for any process cases so we use for PTH the same rule as above as
mentioned below
Sincerely
Michael Jeremias
-----Ursprüngliche Nachricht-----
Von: TechNet [mailto:[log in to unmask]] Im Auftrag von Joyce Koo
Gesendet: Donnerstag, 30. Juli 2009 12:22
An: [log in to unmask]
Betreff: Re: [TN] AW: [TN] FORMULA FOR DETERMINING GOLD PERCENTAGE IN A
SOLDER JOINT
Must be a typo. Should be 0.25 micron? 10 micro-inches?
--------------------------
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----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Thu Jul 30 04:26:14 2009
Subject: [TN] AW: [TN] FORMULA FOR DETERMINING GOLD PERCENTAGE IN A SOLDER
JOINT
IEC 61191-1
chapter 6.2.2 contains the rules
< 1,4% Volume Au, < 3% Wt Au in the final solder interconnection
< 2,5 µm for PTH Wave soldering (I am not confident, that this is low
enough for any process cases so we use for PTH the same rule as above)
You have to take into consideration solder paste volume(stencil-thickness),
wetted Au-surface, wetted Au thickness
Own investigations show, that Au brittelness may occure from 1,6% Vol and
really will occure from 2,3% Vol.
Sincerly
Michael Jeremias
Industrial Engineering (OPPI41)
Electronics Production
((( Defence Electronics
EADS Deutschland GmbH
89077 Ulm
Tel.: +49 (0) 7 31.3 92-5533
Fax: +49 (0) 7 31.3 92-73 15
E-Fax: +49 (0) 7 31.3 92-20 5533
P Before printing, think about the environment !
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