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July 2008

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Subject:
From:
John Burke <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, John Burke <[log in to unmask]>
Date:
Wed, 23 Jul 2008 09:41:38 -0700
Content-Type:
text/plain
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text/plain (204 lines)
Regretfully, my only (very expensive) suggestion is either to vapour phase
them or continue hand soldering.

 
 
John Burke
 
(408) 515 4992
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
Sent: Tuesday, July 22, 2008 6:21 PM
To: [log in to unmask]
Subject: Re: [TN] Lead-free soldering of electrolytic caps

Bismuth 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Tuesday, July 22, 2008 12:09 PM
To: [log in to unmask]
Subject: Re: [TN] Lead-free soldering of electrolytic caps

Well Carl,

At leat I can say like Chef Inspector Clouseau: «now we're getting
somewhere».

That means I would need your input on manual soldering. Are they bulging
when soldered like that? How do you guys go about it, solder paste and heat
gun or iron and wire? How do you make sure the solder reflowed under the
part?
This particular design is not very generous with us either, no isothermals
around the pads of the caps as they are connected to fairly large planes of
Cu so they need some big heating.

And lead-free on top of it...

Thanks,

Ioan

-----Message d'origine-----
De : Carl Proescholdt [mailto:[log in to unmask]] Envoyé : July 22, 2008 11:58
AM À : TechNet E-Mail Forum; Ioan Tempea Objet : RE: [TN] Lead-free
soldering of electrolytic caps

Ioan,

I am anxious to hear of other's experience on this as we need a better
approach here too. 

We have run these very same parts.  Due to the mixture of high mass parts on
our particular board, we were not able to get the reflow temps down enough
to prevent the bulging and still reflow the lead free paste adequately.  We
tried Alpha's protective cap, but we still were not able to dial in the
profile.  Our customer determined that this bulge was directly related to
eventual component failure.   The end result was very painful to me -- we
are now hand soldering them...

Let's hope there are other ideas out there to help us along!

Carl
dca 

  

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Tuesday, July 22, 2008 10:43 AM
To: [log in to unmask]
Subject: Re: [TN] Lead-free soldering of electrolytic caps

Richard,

The issue I am having is that they bulge at the top. Could not get any
answer from Panasonic on whether bulging is bad or acceptable.

One thing I can tell though is that we have to heat them really low in order
to avoid the bulge, even in leaded processes.

Thanks,

Ioan


-----Message d'origine-----
De : Stadem, Richard D. [mailto:[log in to unmask]]
Envoyé : July 22, 2008 11:21 AM
À : TechNet E-Mail Forum; Ioan Tempea
Objet : RE: [TN] Lead-free soldering of electrolytic caps

We reflowed thousands of these very same caps in different products in a
previous life, and I don't recall any problems with them from an operating
or reliability standpoint. But that was with a MRT of around 230 deg. C, and
a TAL of about 60 seconds.

The bigger problem with them was handling.

Because the two leads coming out from the bottom of the can puts it on a
center fulcrum, any operator who puts their fingers or thumbs on the top of
these cans and rocks them even slightly when handling the assembly will
cause the pads to lift right off of the board. We had to train and retrain
the operators not to touch these parts.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Tuesday, July 22, 2008 9:45 AM
To: [log in to unmask]
Subject: [TN] Lead-free soldering of electrolytic caps

Dear Technos,

 

I need to solder these babies, see
http://www.panasonic.com/industrial/components/pdf/PIC_FK_SERIES.pdf on
lead-free. We're on SAC305.

 

Please check the last page of the spec, series EEV-Q and EEV-M, the big
cans. I must say that Panasonic does not really help us assemblers by
labelling the parts as being RoHS compliant; they might not have the banned
stuff in them, but they are anything but high-temp. When designers see RoHS
compliant, it's case closed for them and open issues for us. 

 

How are you guys getting around the poor temperature rating of the
component? Would the cool caps work? Are you soldering them manually?
Should I bother studying the Bi alloys?

 

Thank you,

 

Ioan


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