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January 2005

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Subject:
From:
Gabriela Bogdan <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Gabriela Bogdan <[log in to unmask]>
Date:
Thu, 27 Jan 2005 19:34:48 +0200
Content-Type:
text/plain
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text/plain (156 lines)
Sure, next week.
Gaby
----- Original Message -----
From: "David D. Hillman" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, January 27, 2005 7:31 PM
Subject: Re: [TN] Solder tags and tin thickness


> Hi Gaby! Just like Christmas! You got not only tin whiskers but poor
> solderability and zincification! Can you shoot a photograph for Steve G.
to
> post on his website?
>
> Dave
>
>
>
>              Gabriela Bogdan
>              <gabriela@NETVISI
>              ON.NET.IL>                                                 To
>              Sent by: TechNet          [log in to unmask]
>              <[log in to unmask]>                                          cc
>
>                                                                    Subject
>              01/27/2005 10:52          Re: [TN] Solder tags and tin
>              AM                        thickness
>
>
>              Please respond to
>               TechNet E-Mail
>                    Forum
>              <[log in to unmask]>
>              ; Please respond
>                     to
>               Gabriela Bogdan
>              <gabriela@NETVISI
>                 ON.NET.IL>
>
>
>
>
>
>
> Today I got from one of our new customers a bag wuth brass tags
> electroplated with BRIGHT tin , NO UNDERPLATING, age 6 months, with very
> poor solderability.
> Observatin under microscope- not only pitting, but little mounds of tin
> and-of course-I am always the lucky one- WHISKERS which could be
> photographed easily under a zoom microscope. Ain't I lucky???
> Gaby
> ----- Original Message -----
> From: "Ingemar Hernefjord (KC/EMW)" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, January 27, 2005 6:21 PM
> Subject: Re: [TN] Solder tags and tin thickness
>
>
> > Dave,
> > you were very close to the truth! We have experienced exactly what you
> mention. Had to skip whole lot of parts, because they were only partly
> solderable. I'll send a pic offline to you. The zincificaion brotherhood..
> >
> > The manufacturers of these tiny things do not seem to take nickel so
> serious as you and I, because many of them just specify tin over brass.
> >
> > I like both english breakfast and american. I must admit, that I was
> little bit in doubt about the US early meal appropriateness first time I
> sat
> down beside a guy in a typical tramlike bar in Syracuse. Time was about
> half
> past six in the morning, I was still halfsleeping, and that guy was
digging
> in  a huge stack of pancakes. He drowned the pancakes in syrup and down
> they
> went. Then he ordered another stack and ended up with donuts and Coke. Now
> I
> make them myself, but use strong english coffee instead of Coke. Dual
> influence, so as to say.
> >
> > Ingemar
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]]
> > Sent: den 27 januari 2005 14:37
> > To: [log in to unmask]
> > Subject: Re: [TN] Solder tags and tin thickness
> >
> >
> > Hi Ingemar! Don't forget that if you don't use a barrier metal between
> the
> > solder joint and the brass pin you have a chance of the solder joint
> > integrity being questionable due to "zincification". Zinc from the brass
> > can potentially diffusion into the solder joint causing problems. Either
> a
> > nickel or a copper barrier plating of the brass pin will eliminate the
> > phenomena.
> >
> > Oh, an alternative American breakfast would be Diet Coke and a Snickers
> or
> > Doug's Mt. Dew and a bagel. Remember I said alternative, not healthy!
> >
> > Dave Hillman
> > Rockwell Collins
> > [log in to unmask]
> >
> >
> >
> > Morning all, what about a simple q while melting first meal of the day?
> > (US:donuts and coffee ; UK:scrambled eggs, black pudding, sausage,
> > marmelade, plums,juice, milk, scones, bacon, coffee, cheese, tomatoes,
> etc)
> >
> > Solder tags, pin, eyelets for printed boards, pressfit. We have found
> large
> > variations in tin thickness from various manufacturers. Checked about 20
> > known makers, and none specified exactly what plating they had. Just
> > 'tinned brass' or 'special high quality tin process' or 'solderable
> > plating' etc. Too thin tin will make the pins less solderable after some
> > months, while exaggerated thickness will cost some extra and cause
> > tolerance problems. So, gentlemen, what do you prefer for  a Veroboard
> pin
> > or a backplane ditto? I've proposed minimum 10 microns over nickel if
the
> > pins are brass. Or minimum 25 microns of tin without nickel barrier.
Does
> > this sound reasonable?
> >
> > Ingemar Hernefjord
> > Ericsson Microwave Systems
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>
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