Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Solder Paste & RF products

#26326

Solder Paste & RF products | 11 November, 2003

Folks,

has anyone heard fo any problems with RF cards related to solder paste selection. Currently runnign with std SnPb paste but want to move to 2% silver paste. Was asked if this could cause any issues in term's of RF capability or interferance to the card. Running RF cards before on 2% silver I can't say I've ever had any issues but has anyoen else ever come up against anything on silver paste or other pastes?

cheers

John

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#26333

Solder Paste & RF products | 12 November, 2003

2% should have no effect [recognizing that some RF deign implementations are squirrellyand they don't count]. We still use 2% dating back to the old days when the gray beards [at that time] felt that the silver improved skin effect [a tendency for alternating current (AC) to flow mostly near the outer surface of a solid electrical conductor] conduction.

Actually, silver does improve skin effect. It's just not clear, to us, what is the proper portion of silver. Look here: http://www.audioholics.com/techtips/audioprinciples/interconnects/SkinEffect_Cables.htm

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#26337

Solder Paste & RF products | 12 November, 2003

Thanks for the info Dave, the link provides very interesting reading!

btw, JohnW and JohnWnz are one and the same, I've moved down to Sunny New Zealand to ply my trade / skills down here and have soem fun in the sun while I'm at it. A move I'd totally recomend!

John

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#26338

Solder Paste & RF products | 12 November, 2003

I was reading something on the Maori and whale watching the other day. Sounds beautiful. Congrats on the new job, mate.

Please drink an Australis Benediction for me.

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