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
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"Ingemar
Hernefjord
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Sent by: TechNet
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[TN] Solder tags and tin thickness
01/27/2005 05:45
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"Ingemar
Hernefjord
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<ingemar.hernefjo
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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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