We have spent 12 months researching the compliance status of original IC
manufacturers and all the evidence to date suggests there are no backward
compatible issues apart from perhaps tin whiskers, which I am not qualified
to comment on.

Moreover, it is quite possible that OEM's have already used Pb-free devices
in traditional Sn Pb solder processes without realising.  Texas Instruments
have been shipping lead free product since 1989 (Ni Pd finish) and claim to
have more than 30 billion Pb-free device in the field.  Linear Technology
used a matte-tin terminal finish on surface mount SOIC packages between 1983
and 1988 with "excellent quality and reliability performance in the field".

It is worth noting that early, and many current lead free devices are not
necessarily RoHS compliant.  Some contain other banned substances from the
directive (notably PBB and PBDEs), while much of Texas Instruments Pb-free
offerings have a maximum temperature rating of 220 /c.

I hope this helps.

Paul


Paul Chinery
Dionics plc
T : +44 (0)2476 713366
F : +44 (0)2476 714488
E : [log in to unmask]


-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of H. Molema
Sent: 10 June 2003 11:38
To: [log in to unmask]
Subject: [LF] article and research request


Hello,

I have been asked to do research on the following subject. At this moment
we are still wave soldering and reflow soldering with sn/pb. I would like
to know what could happen with the solder reliability when we get one
component on a board that is lead free while all the other components and
the PCB are sn/pb and we are going to solder the board with sn/pb using a
solder profile for sn/pb. Is the reliability of the solderjoint an issue?
Can anybody tell me were I can find any articles or research on this
subject, I wasn't able to find much on this specific issue.
Any help is appreciated.

Kind regards,

H. Molema

VariAss Electronics BV
Supplier of Industrial Electronics

E-mail   : [log in to unmask]
Tel.     : +31 (0)598 619475
Fax      : +31 (0)598 613538
Website : www.variass.nl

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