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January 2005

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Subject:
From:
"Ingemar Hernefjord (KC/EMW)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ingemar Hernefjord (KC/EMW)
Date:
Thu, 27 Jan 2005 12:45:37 +0100
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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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