lead free solder again

mrdarrett · 2006-07-10T22:02:43+00:00

I saw some pictures of those "tin whiskers", and I didn't know theproblem was so great.So... is Airbus required to go for lead-free solder too, for RoHS andall that...?Hoo-boy... if so, wouldn't want to fly on any Airbus aircraft builtafter 2006, then...Michael

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qrk 20 years ago

[snippage]

Exactly, it is the fear of the unknown. I don't worry about the QC VPs

- that's a big company issue. I worry about the health of small companies. This has the possibility of financially straining small companies if they end up with a couple years worth of failed equipment that's under warranty due to lead-free issues. With all the 0.5mm pitch parts we're using now, you bet I'm fearful of the unknown issues with lead-free in industrial equipment designed to last for >10 years.

Mark

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qrk 20 years ago

This is like saying George Bush does what the 'Merican public wants him to do.

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Eeyore 20 years ago

I was just reading about exemptions and I saw an inference that 'process control' equipment is exempt.

Ought to look into it further.

Graham

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John Popelish 20 years ago

I like this historical summary:

formatting link

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Frank Bemelman 20 years ago

"qrk" schreef in bericht news: snipped-for-privacy@4ax.com...

Is that not true then? He was elected for a 2nd period.

Thanks, Frank. (remove \'q\' and \'.invalid\' when replying by email)

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Frank Bemelman 20 years ago

"qrk" schreef in bericht news: snipped-for-privacy@4ax.com...

the

Is it possible to buy an insurance against such warranty disasters? Make it a book keepers problem.

What about conformal coating? Not a bad idea anyway, for industrial circuit boards.

Thanks, Frank. (remove \'q\' and \'.invalid\' when replying by email)

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Eeyore 20 years ago

I see you're one of those 'cost isn't an issue' guys !

Bloody typical.

Graham

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Ken Smith 20 years ago

In article , Frank Bemelman wrote: [....]

Conformal coating is a horrid idea. Put the circuit boards in a housing that protects them. From what I've seen coating just adds another way to screw up.

-- kensmith@rahul.net forging knowledge

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Ken Smith 20 years ago

In article , Frank Bemelman wrote: [...]

.... but did that lead come from the little bit thats in solder or was it from all that lead paint that was being scraped and the gasoline etc?

-- kensmith@rahul.net forging knowledge

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Robert Baer 20 years ago

Metal whiskers are very crystalline, and are hundreds if not thousands times stronger than even pure metal sheet or rod.

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Rich Grise 20 years ago

This is all very interesting and stuff, but has anybody ever actually made tin whiskers "on purpose", to maybe study them?

Thanks, Rich

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Eeyore 20 years ago

You don't need to. They just spring up anyway .

Graham

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Frank Bemelman 20 years ago

"Eeyore" schreef in bericht news: snipped-for-privacy@REMOVETHIS.hotmail.com...

The

of

shitloads

It's true that costs were never my first priority. But if tin wiskers is what worries you, I though that coating is perhaps something that make you sleep better at night. You can save a few nickles if you only coat the edges of your TQFP's with coating.

Anyway, you have the choice.

Thanks, Frank. (remove \'q\' and \'.invalid\' when replying by email)

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Frank Bemelman 20 years ago

in

They are also hundreds if not thousand times thinner than pure metal sheet or rod. Probably softer than the hairs on your wife's arm ;)

Thanks, Frank. (remove \'q\' and \'.invalid\' when replying by email)

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Robert Latest 20 years ago

On Wed, 12 Jul 2006 18:35:22 GMT, Joerg wrote in Msg.

Do you actually believe that the failures will reach "epidemic proportions"?

The way I see it, whisker growth only affects un-annealed, Sn- electroplated Cu surfaces. Not solder joints. And don't forget the boost the RoHS directive gives to solid state physics research.

robert

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