ROHS compliance ... application problems

ashok · 29th July 2007, 02:15 AM

have you guys seen this write up about ROHS problems

http://www.cinemag.biz/rohs/RoHS-AN-105.pdf

or

http://www.cinemag.biz/rohs.html

Conrad Hoffman · 29th July 2007, 04:02 AM

This is fairly old news to people in the biz, and whisker growth has been a problem in some power op-amps long before rohs. It's also one of the things that kills old NiCd batteries. Fortunately, modern processor based electronic products go obsolete about 48 minutes after purchase, so it shouldn't be a problem.

ashok · 29th July 2007, 04:23 AM

".............electronic products go obsolete about 48 minutes after purchase..............."

That's a great one !

Anyway , you just reminded me of the Nicad problems . You can clearly see the power cells in my brain are also shorting out !
Memory seems to be fading fast !

Pjotr · 29th July 2007, 01:45 PM

And already ages ago organ pipes fell apart due to “tin-rot”

jneutron · 30th July 2007, 01:09 PM

Tin whiskers are a problem with PURE TIN.

Plated, dipped, whatever. Pure tin grows whiskers.

I have not seen any reports anywhere on whiskers on a tin/silver alloy of any mix. Either in industry, or in my work.

Tin pest is the degradation of pure tin as a result of cold.

Again, there have not been any reports of tin pest occuring on any tin solder alloys. I have not seen a tin alloy do this. Again, either in industry, or in work.

I have used tin/silver for 14 years, have purchased and consumed several thousand pounds, and the vast bulk of those tons of lead free solder is either at 77 Kelvin, or 4.5 Kelvin. Rather cold.

And no whiskers, no pest. Tens of thousands of solder joints, and only one failure. (human error).

Cheers, John

ps..but whadda I know...

Pjotr · 30th July 2007, 04:45 PM

Hi jneutron,

That’s a relief. Was afraid not to leave ROHS’s compliant electronic equipment outdoors in wintertime

But I have the same experience as you with lead-free production during the last year. In contrary to that, tin-lead joints degrade when exposed to mechanical stress and can become loose. E.g. wrong mounted power semiconductors exposed to thermal cycling. Lead-free solder is much more resistant to mechanical stress.

Cheers

29th July 2007, 02:15 AM	#1
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	ROHS compliance ... application problems have you guys seen this write up about ROHS problems http://www.cinemag.biz/rohs/RoHS-AN-105.pdf or http://www.cinemag.biz/rohs.html __________________ AM

29th July 2007, 04:23 AM	#3
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	".............electronic products go obsolete about 48 minutes after purchase..............." That's a great one ! Anyway , you just reminded me of the Nicad problems . You can clearly see the power cells in my brain are also shorting out ! Memory seems to be fading fast ! __________________ AM

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29th July 2007, 04:02 AM	#2
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	This is fairly old news to people in the biz, and whisker growth has been a problem in some power op-amps long before rohs. It's also one of the things that kills old NiCd batteries. Fortunately, modern processor based electronic products go obsolete about 48 minutes after purchase, so it shouldn't be a problem.

29th July 2007, 01:45 PM	#4
Pjotr diyAudio Member Join Date: Nov 2002 Location: Netherlands	And already ages ago organ pipes fell apart due to “tin-rot”

30th July 2007, 01:09 PM	#5
jneutron diyAudio Member Join Date: Jan 2004 Location: away	Tin whiskers are a problem with PURE TIN. Plated, dipped, whatever. Pure tin grows whiskers. I have not seen any reports anywhere on whiskers on a tin/silver alloy of any mix. Either in industry, or in my work. Tin pest is the degradation of pure tin as a result of cold. Again, there have not been any reports of tin pest occuring on any tin solder alloys. I have not seen a tin alloy do this. Again, either in industry, or in work. I have used tin/silver for 14 years, have purchased and consumed several thousand pounds, and the vast bulk of those tons of lead free solder is either at 77 Kelvin, or 4.5 Kelvin. Rather cold. And no whiskers, no pest. Tens of thousands of solder joints, and only one failure. (human error). Cheers, John ps..but whadda I know...

30th July 2007, 04:45 PM	#6
Pjotr diyAudio Member Join Date: Nov 2002 Location: Netherlands	Hi jneutron, That’s a relief. Was afraid not to leave ROHS’s compliant electronic equipment outdoors in wintertime But I have the same experience as you with lead-free production during the last year. In contrary to that, tin-lead joints degrade when exposed to mechanical stress and can become loose. E.g. wrong mounted power semiconductors exposed to thermal cycling. Lead-free solder is much more resistant to mechanical stress. Cheers