Wow! Is the word. J
John, if we give you and your company credit, can we use this photo for
training purposes?
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stephen Gregory
Sent: June 22, 2005 5:41 PM
To: [log in to unmask]
Subject: Re: [TN] Moisture sensitivity levels...
YOW! These look almost as bad as being powered-up after being
installed wrong polarity...except then, you usually have have a bunch
of burned marks all over. Nice photo...
Go to: http://www.stevezeva.homestead.com click on Picture Page 2,
and look for "Exploding Tantalum".
Thanks for the picture John!
Kind regards,
-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
|---------+---------------------------->
| | John Maxwell |
| | <[log in to unmask]
| | m> |
| | |
| | 06/22/2005 03:59 |
| | PM |
| | |
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>-----------------------------------------------------------------------
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| To: [log in to unmask]
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| cc:
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| Subject: Re: [TN] Moisture sensitivity levels...
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Steve,
I sent the choicest image for your web page for all to enjoy. Tantalum
capacitors are made using a sintered tantalum slug that is very porous
with
a MnO2 or polymer cathode. I have seen polymer parts that have been MSL
rated at level 5 from several vendors. Some of those polymer parts also
undergo pressure cooker moisture testing at some vendors prior to
electrical test to find the leakers and then they are baked out. The
image
is not of a polymer tantalum cap but one that uses an MnO2 cathode
resulting in a lower MSL rating, at the time of failure (2000) no rating
at
all.
Bob Willis of the SMART Group in the UK has a wonderful video of an un
stated molded capacitor launching off a hot plate. Perhaps someone has
that
video clip available.
John
At 01:19 PM 6/22/2005, you wrote:
>John,
>
>Could you send me the picture to post on my web page?
>
>I'm sure a lot of people would like to see it.
>
>Kind regards,
>
>-Steve Gregory-
>Senior Process Engineer
>LaBarge Incorporated
>Tulsa, Oklahoma
>(918) 459-2285
>(918) 459-2350 FAX
>
>
>
>|---------+---------------------------->
>| | John Maxwell |
>| | <[log in to unmask]
>| | M> |
>| | Sent by: TechNet |
>| | <[log in to unmask]>|
>| | |
>| | |
>| | 06/22/2005 02:41 |
>| | PM |
>| | Please respond to|
>| | TechNet E-Mail |
>| | Forum; Please |
>| | respond to John |
>| | Maxwell |
>| | |
>|---------+---------------------------->
>
> >
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--------------------------------------|
> |
> |
> | To: [log in to unmask]
> |
> | cc:
> |
> | Subject: Re: [TN] Moisture sensitivity
> levels... |
>
> >
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--------------------------------------|
>
>
>
>
>Ingemar,
>I have a lovely photo of a tantalum cap that burst open during lead
free
>reflow. Lots of venting of steam also moving adjacent parts from
tantalum
>caps that did not rupture. What fun this lead free will be.
>
>John Maxwell
>
>At 12:15 AM 6/22/2005, you wrote:
> >Hi Gaby,
> >
> >we do have 60% too, all mounting area is 50-60% in order to get low
ESD
>risk.
> >And still, most reels have no baking. Tantalum epoxy molded,
resistors,
> >ceramics,
> >SOTs, QFPs etc are exposed to the humidity in the assembly halls. And
they
>are
> >soldered with no problems, as far as I know. Millions of them.
> >
> >Exceptions: superBGAs and very large QFPs which are MS classed by the
> >component
> >maker himself. These are stored in nitrogen cabinets or in plastic
bags
>with
> >dessicators. So, MS classed components are handled with care.
> >
> >You did not tell us what components caused big trouble. Were they MS
>classed ?
> >
> >Inge
> >
> >-----Original Message-----
> >From: Gabriela Bogdan [mailto:[log in to unmask]]
> >Sent: den 21 juni 2005 16:40
> >To: TechNet E-Mail Forum; Ingemar Hernefjord (KC/EMW)
> >Subject: Re: [TN] Moisture sensitivity levels...
> >
> >
> >Inge, try to work in an environment with up to 60% humidity... we are
>baking
> >and baking again...
> >If we miss we are in big trouble.
> >Gaby
> >----- Original Message -----
> >From: "Ingemar Hernefjord (KC/EMW)" <[log in to unmask]>
> >To: <[log in to unmask]>
> >Sent: Tuesday, June 21, 2005 9:53 AM
> >Subject: Re: [TN] Moisture sensitivity levels...
> >
> >
> > > Steve,
> > > how come that you jumped high so sudden? Have you used some kind
of
> > > humidity issue filter
> > > all these years...he-he..cheating. There is humidity everywhere.
Mother
> > > nature infiltrates
> > > water vapour molecules everywhere she can. We learned that there
is
> > > humidity even on inside
> > > of glass feedtrues, water penetrates deeply into kovar packages,
there
>is
> > > water in the solder
> > > paste, every single "plastic" has a small amount of water on
inside.
>Water
> > > molecules are
> > > universal and unavoidable. We had a period of humidity hysteria,
digged
> > > deeply into the
> > > mystery of water penetration mechanisms by means of proffessors
and
> > > doctors, had seminars,
> > > and the learned painted scaring scenarios about all bad things
that
>could
> > > occur due to water in
> > > the material. We spent a lot of money on residue gas analysis and
made
> > > lots of MIL STD
> > > tests and so on. The years pass and behold, a miracle: there has
been
>no
> > > catastroph. Some
> > > few reports have been noticed, but the equipments spread all over
the
> > > globe seem to work,
> > > and mounting seems to go on rather free from incidents despite
there
is
> > > water in every
> > > single component. So, I wonder if all anti-humidity
countermeasures
are
> > > proportional to the
> > > very few failures that occur due to water.
> > >
> > > My thoughts do not necesserarily represent the general opinion
here,
>I'm
> > > just curious about
> > > the mystery of water content and others experience. Is humidity a
>severe
> > > problem today?
> > > Can anyone give example?
> > >
> > > (I don't include water that penetrates into packages from the
>surrounding
> > > during field use,
> > > but just point at built-in humidity in parts before and during
>assembly.)
> > >
> > > Ingemar Hernefjord
> > > Ericsson Microwave Systems
> > >
> > > -----Original Message-----
> > > From: TechNet [mailto:[log in to unmask]]On Behalf Of Stephen Gregory
> > > Sent: den 20 juni 2005 17:26
> > > To: [log in to unmask]
> > > Subject: [TN] Moisture sensitivity levels...
> > >
> > >
> > > Good mornin' all!
> > >
> > > I hope all you Dads out there had a wonderful Fathers Day!
> > >
> > > As I posted about a week or so ago, we're getting our stockroom
> > > personnel to really focus on component moisture sensitivity
levels.
> > >
> > > But now I'm starting to get a little confused about how components
> > > are generally classified with their respective MSL ratings.
> > >
> > > I've always thought that it had to do with component body size and
> > > thickness,
> > > but now I'm finding out that it doesn't necessarily.
> > >
> > > My stockroom clerk showed me an IDT SOJ28 that came in sealed with
a
>MSL 3
> > > rating that we now have in our dry box because the package was
opened.
> > >
> > > We have some Cypress SOJ28's and SOJ24's that are on reels that
are
not
>in
> > > original packaging, so I called Cypress and asked what the MSL
rating
>is
> > > for the
> > > two part numbers and they are a MSL 1. Cypress gave me a link to
the
>SRAM
> > > Qualification Report that states that.
> > >
> > > Now my stockroom clerk brought me some Vishay tantalum caps that
have
> > > a MSL 2a rating label on them, and they are TNTC's. This is THE
FIRST
>time
> > > I
> > > have ever seen a MSL label on a tantalum capacitor.
> > >
> > > Are these ratings based on qualification reports? Or can one look
at
>the
> > > size and
> > > thickness of the part to base how you will handle it?
> > >
> > > Kind regards,
> > >
> > > -Steve Gregory-
> > > Senior Process Engineer
> > > LaBarge Incorporated
> > > Tulsa, Oklahoma
> > > (918) 459-2285
> > > (918) 459-2350 FAX
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