Indeed it is.
Some time back I gave a workshop where I had people from an auto parts supplier. They made the same electronics for a Detroit out fit and Toyota and were required the same acceptance test. The big difference was 600 cycles for Detroit, 4,000 cycles for Toyota.
Werner
-----Original Message-----
From: Lee parker <[log in to unmask]>
To: TechNet E-Mail Forum <[log in to unmask]>; [log in to unmask]
Sent: Thu, 19 Mar 2009 8:26 am
Subject: Re: [TN] Using CEM-1 in Pb-free Wave Solder?
I suppose this is one of the reasons that many years ago I began buying
Japanese automobiles and never looked back!
Best regards
Lee
JLP Consultants LLC
804 779
3389
----- Original Message -----
From: Werner Engelmaier /*
To: [log in to unmask]
Sent: Wednesday, March 18, 2009 8:33
PM
Subject: Re: [TN] Using CEM-1 in Pb-free
Wave Solder?
Hi Lee,
The 4+ million recall was forced by NHTSA—what
happened was that the windshield wipers stopped working---sometimes in less
than one year.
In terms of technical documentation; I use it as a case
study in my 'Root Cause Analysis' workshop.
No preproduction
certification that I know of; and if they did they obviously did not know what
they were doing---but that, of course, is not unique to
GM.
Werner
-----Original Message-----
From:
Lee parker=2
0<[log in to unmask]>
To: [log in to unmask]
Sent: Wed, 18 Mar 2009
8:21 pm
Subject: Re: [TN] Using CEM-1 in Pb-free Wave
Solder?
Werner
Has this GM
issue been documented anywhere.
Also, I am wondering why the laminate
manufactures have not responded to this
inquiry.
I have worked with
many customers who have had CEM-1 boards built in Asia and I
am not aware
of any adverse effects although none were automotive. Generally, we
were
careful to be sure that the material was compatible with the specified
environment. Was any preproduction certification performed in the case you
mentioned below?
Best regards
Lee
JLP Consultants LLC
804
779 3389
----- Original Message -----
From: Werner
Engelmaier /*<mailto:[log in to unmask]>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Wednesday, March 18, 2009 3:08 PM
Subject: Re: [TN]
Using CEM-1 in Pb-free Wave Solder?
Hi Eric,
IPC
has quality Classes 1 through 3; CEM-1 with unsupported holes is Class
-1.
This is the same material
/design combination that resulted
in GM having to
recall over 4 million SUVs and trucks.
CEM-1 not
only has a high CTE, but also is hygroscopic and swells
significantly when
absorbing moisture—bad combination for Pb-free T's and
automotive
application.
Werner
0A
-----Original Message-----
From: Honsowetz, Eric <[log in to unmask]<mailto:[log in to unmask]>>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Wed, 18 Mar 2009 2:59 pm
Subject: [TN] Using CEM-1 in Pb-free
Wave Solder?
Good Afternoon
Technetters;
So having been googling through this question for a
couple of days off
an on I am turning to that one definite source of
knowledge, you all...
What are the ideas regarding using CEM-1
material in a Pb-free (SAC)
wave soldering process for a high
reliability product (Automotive - 15
year life without
failure). This would be a copper on one side board
with
through-hole parts only.
BTW googling provides the best of both
worlds...people saying "yes" and
others saying "no" so whatever your
answer you can't be wrong. :)
Best Regards,
eric
248-447-1038 (desk)
734-223-5599 (cell)
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