Put Brakes on EMI ‘Conclusions’

I know and respect the team at Circuitnet, but it seems like they made a pretty serious goof the other today.  Their top story  had headlines stating, “Tin Whiskers Behind Toyota Recall.”  The link to this story takes us an article with the title “Electronic Tin Whiskers may be behind Toyota recalls.”

So we start with a headline telling us that tin whiskers are behind the recall and when we go to the main article we see that tin whiskers may be behind the recalls.  The person that the article is quoting is Keith Armstrong an EMI (electromagnetic interference) expert.  In this article Armstrong states that EMI may be the culprit in Toyota brake malfunction.

From what I see in the article, Armstrong has no data, and has not looked at a failed Toyota brake system.  He is just arguing that EMI may be the culprit.  Who knows?

Armstrong is then quoted as saying that tin whiskers, in the lead-free solder, may be to blame for the recalls and he then references work by John Barnes.  Barnes’ exhaustive summary has nothing to say about tin whiskers in Toyota braking systems, just a bit about tin whiskers in general in the over 1,000 pages about lead-free issues.  Armstrong is then quoted as saying that the tin whisker problem, “has caused serious problems in the computer industry previously.”  The article at this link is dated Nov. 12, 2002, and is simply a call for papers on tin whiskers at a conference.  Strong suggestions for having no data!

I don’t want to minimize the concern for tin whiskers, but the headline in Circuitnet and the article it links to have nothing factual to do with tin whiskers in the Toyota recall situation.  Given the seriousness of this situation, this misleading reporting is troubling indeed.

Cheers,
Dr. Ron

P.S.: One commenter to the main article points out that Toyota uses leaded solder in the brake electronics.  I don’t know if this is true, but given the RoHS exemption that auto electronics has for lead, it would not surprise me.

In summary: Double yikes!!

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About Dr. Ron

Materials expert Dr. Ron Lasky is a professor of engineering and senior lecturer at Dartmouth, and senior technologist at Indium Corp. He has a Ph.D. in materials science from Cornell University, and is a prolific author and lecturer, having published more than 40 papers. He received the SMTA Founders Award in 2003.

1 thought on “Put Brakes on EMI ‘Conclusions’

  1. Pingback: Sans Data, Toyota ‘Whiskers’ Claims Razor Thin at Circuits Assembly blog

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