HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
News
Electronics & Test

Tin Whiskers Again Cited as Potential Problem for Toyotas

NO RATINGS
View Comments: Newest First|Oldest First|Threaded View
<<  <  Page 2/6  >  >>
Chris PE
User Rank
Gold
Re: Bring lead back to electronics.
Chris PE   7/31/2012 4:05:49 PM
NO RATINGS
Exactly!

oldbikefixr
User Rank
Silver
Re: Bring lead back to electronics.
oldbikefixr   7/27/2012 5:37:59 PM
BigEd....lead was added to tin solder in the early 1900's to prevent the formation of tin whiskers.

Leaded solder connections do corrode when exposed to active elements, but that is not the same as tin whiskers. This corrosion can be reduced/prevented with the use of conformal coatings.

Tests with lead content vs whisker formation indicates that as little as 3% lead will prevent the formation of tin whiskers.

 

Tom Drechsler
User Rank
Silver
Re: We all make mistakes
Tom Drechsler   7/27/2012 11:29:32 AM
If the recylcing rate on consumer electronics approached that of car batteries, none of this would be necessary. All we have to do is implement a $15 core charge on every consumer electronics item, maybe $150 on every commercial electronics good. Instead, we ship it all to Nigeria ( or China or Vietnam) & let them extract the metals.

Chris PE
User Rank
Gold
We all make mistakes
Chris PE   7/27/2012 9:24:29 AM
We all make mistakes.ROHS was one of them. It cost billions of dollars in losses, equipment and defective products.As for military , I cannot give the name of a document, but in April this year all of military products have been taken off the ROHS requirement. There may be some electro - mechanical assemblies of high power  ,that still "linger" , but are on the way out.Car batteries are the highest concentration of lead in the environment, so stupid solder on PC board does not even matter.Needle in a stack! We all have to be realistic about this and Toyota cover-up was just a lie.

robatnorcross
User Rank
Gold
Re: Bring lead back to electronics.
robatnorcross   7/26/2012 8:58:47 PM
"Several Years" doesn't quite cut it. Many military systems have to last for decades and have life or death consequences. Military systems must also endure really "bad" environments i.e. salt water, jungle humidity and heat among others.

I find it ironic that Grassley and his cohorts pretend to know about EVERYTHING. They allow Brussels (the EU) to dictate what the world does and then get all upset when things go to hell. They then start demanding explanations from people that they forced to comply to their previous bad decisions.

studleylee
User Rank
Gold
Re: Bring lead back to electronics.
studleylee   7/26/2012 6:46:09 PM
Agreed and good viewpoints to know. I don't really like the idea of not having a 'hard key' ignition. When I run my current rides to death, I will install a manual kill on whatever I get. I usually get 200K+ out of a car though, an EStop if you will :-)

BigEdRetired
User Rank
Iron
Re: Bring lead back to electronics.
BigEdRetired   7/26/2012 6:31:02 PM
"Tin Whiskers" were trouble makers before "Lead-Free".  Advoidance approaches are well known- cleanliness, use of conformal coatings, physical seperation of critical points, etc.  In addition, the method of using two sensors with different outputs on the petal and using logic in the receiving device gives additional assurance of being able to detect a failure and taking corrective action.

If all of the trouble advoidance procedures generally used with critical electronic controls are implemented, the failure is more probably a result of operator error or physical hardware failure.

Last but not least is the very high probability that the driver may have pressed the brake and the accelerator simultaneously.  Todays cars have the foot area so compact that drivers like myself (14EEE shoes) and women wearing heals cannot insure that they activate only the brake pedal. 

Note: Lead-Free electronics are generally banned from aircraft/spacecraft applications because of the supposedly possibility of tin whiskers.  LeadFree is not generally banned for other military applications and has been used for several years very sucessfully.

studleylee
User Rank
Gold
Re: Bring lead back to electronics.
studleylee   7/26/2012 5:50:04 PM
That mostly occurred AFAIK in stannous tin plating of surfaces. The cure was to up the lead content. I may be wrong but thanks for adding. Related: I purchased an industrial PlasmaCutter a few years back and found it was DOA due to HyperTherm switching the assembly line over to rohs solder and components. The higher solder temps warped assemblies. They fixed it under warranty and it works fine. thx -Lee

Tom Drechsler
User Rank
Silver
Re: Bring lead back to electronics.
Tom Drechsler   7/26/2012 4:31:46 PM
NO RATINGS
I think you will find that tin whiskers long preceeded the implementation of RoHS processes. That is a red herring.

mario.herrera
User Rank
Iron
Re: More information
mario.herrera   7/26/2012 3:40:10 PM
Unfortunately the RoHS regulations were only the beginning. Please read up on the EU's REACH laws. Conveniently located here: http://ec.europa.eu/environment/chemicals/reach/reach_intro.htm

My interpretation: If you can first prove that a substance in not harmful in any way to anything, you may be allowed to continue using it.

<<  <  Page 2/6  >  >>
Partner Zone
Latest Analysis
It's been two years since the Mac Mini's last appearance on iFixit's teardown table, but a newly revised version joins Apple's lineup this week.
More often than not, with the purchase of a sports car comes the sacrifice of any sort of utility. In other words, you can forget about a large trunk, extra seats for the kids, and more importantly driving in snowy (or inclement) weather. But what if there was a vehicle that offered the best of both worlds; great handling and practicality?
Kevin Gautier of Formlabs describes the making of a carbon fiber mold for an intake manifold, using a $3,300 3D printer, during Medical Design & Manufacturing Midwest.
Science fiction author Isaac Asimov may have the best rules for effective brainstorming and creativity. His never-before-published essay, "On Creativity," recently made it to the Web pages of MIT Technology Review.
Much has been made over the potentially dangerous flammability of lithium-ion batteries after major companies like Boeing, Sony, and Tesla have grappled with well-publicized battery fires. Researchers at Stanford University may have come up with a solution to this problem with a smart sensor for lithium-ion batteries that provides a warning if the battery is about to overheat or catch fire.
More:Blogs|News
Design News Webinar Series
10/7/2014 8:00 a.m. California / 11:00 a.m. New York
9/25/2014 11:00 a.m. California / 2:00 p.m. New York
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Oct 20 - 24, How to Design & Build an Embedded Web Server: An Embedded TCP/IP Tutorial
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: 10/28-10/30 11:00 AM
Sponsored by Stratasys
Next Class: 10/28-10/30 2:00 PM
Sponsored by Gates Corporation
Next Class: 11/11-11/13 2:00 PM
Sponsored by Littelfuse
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service