[tinwhiskers] Re: [LF] A Change in Paradigm: Maximum Whisker Length Just Got Longer
- From: "Bob Landman" <rlandman@xxxxxxxxxxxxxxxxx>
- To: "'\(Leadfree Electronics Assembly Forum\)'" <Leadfree@xxxxxxx>, <tinwhiskers@xxxxxxxxxxxxx>
- Date: Fri, 5 Feb 2010 15:49:53 -0500
And there's even more.
There's a lawsuit in Michigan. A 77 yr old lady driving a 2005 Camry (that is
not part of the recall) died in 2008 when her car suddenly accelerated to 80
mph, leap into the air and hit a tree. The story is in the NY Times and it's
very detailed. Apparently Toyota and the NHTSA agreed not to count as failures
any vehicles that suddenly accelerated if the brake had been applied.
http://www.nytimes.com/2010/02/05/business/05recall.html?th&emc=th
I had a similar problem years ago in our 1990 Merc Sable. Had to have a
diagnostic recorder attached to the car and then we drove it for many days
pushing a button when the car suddenly accelerated then taking it to the dealer
to have the record downloaded for analysis. The dealer finally traced the
problem to a bad throttle position sensor. Replaced it and it happened again.
It took THREE replacements before they got us a replacement that did not cause
sudden acceleration. We nicknamed the car "killer". Not so funny now.
Fortunately for us, if we pressed hard on the brake (caught it quick enough) we
could stop the car. We'd be driving along and all of a sudden you'd hear the
engine roar. The first time it did it, I was so surprised I didn't know what
to do and then slammed on the brakes. Good thing we wear seatbelts!
This issue with Toyota more and more smells of a coverup.
Bob
-----Original Message-----
From: Leadfree [mailto:Leadfree@xxxxxxx] On Behalf Of Whittaker, Dewey (EHCOE)
Sent: Friday, February 05, 2010 1:15 PM
To: Leadfree@xxxxxxx
Subject: Re: [LF] A Change in Paradigm: Maximum Whisker Length Just Got Longer
John, Chris and Werner,
I would have hoped my alternative for a finish would have been more than just a
term to describe the view of you circling.
Dewey
-----Original Message-----
From: Leadfree [mailto:Leadfree@xxxxxxx] On Behalf Of John Burke
Sent: Friday, February 05, 2010 11:03 AM
To: Leadfree@xxxxxxx
Subject: Re: [LF] A Change in Paradigm: Maximum Whisker Length Just Got Longer
Of course if Dewey were on line he would probably state that the American
consumer takes a dim view of auto reliability problems.....8-)
John Burke
(408) 515 4992
-----Original Message-----
From: Leadfree [mailto:Leadfree@xxxxxxx] On Behalf Of Mike Buetow
Sent: Friday, February 05, 2010 9:04 AM
To: Leadfree@xxxxxxx
Subject: Re: [LF] A Change in Paradigm: Maximum Whisker Length Just Got Longer
More on Toyota. Now they are questioning if the electronics problems extend to
the headlights.
http://seattletimes.nwsource.com/html/nationworld/2010986931_toyota05.ht
ml
Mike Buetow
Circuits Assembly
w/m 617-327-4702
>>> REGISTER FOR VIRTUAL PCB -- MARCH 2-4 www.virtual-pcb.com <<<
-----Original Message-----
From: Leadfree [mailto:Leadfree@xxxxxxx] On Behalf Of Bob Landman
Sent: Thursday, February 04, 2010 4:29 PM
To: Leadfree@xxxxxxx
Subject: [LF] A Change in Paradigm: Maximum Whisker Length Just Got Longer
Have you read this article ?
Tin whisker induced field failures of medical equipment using flexible film
connector (FFC) contact receptacle that is ("matte" <-- supplier's
terminology) tin plating over 1.5 microns nickel over copper alloy
http://www.dfrsolutions.com/uploads/white-papers/Maximum_Whisker_Length2
.pdf
Tin Whisker Mitigation
Current, DfR advises companies that mitigation of components with lead spacings
greater than 500 microns may not be necessary if the plating is matte tin and
the manufacturer demonstrates some evidence of control (either through process
control or periodic testing). Leads with welding operations or pressure
contacts do not fall under that recommendation.
DfR is now modifying our approach and we now recommend that NO tin-plated
connectors be used unless physical barriers are present between leads/pins or
the spacing between leads is at least 1000 to 2000 microns (driven by degree of
risk aversion).
===================
That's quite a recommendation!
Bob Landman
H&L Instruments, LLC
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