[time-nuts] PCB for frequency dividers

David C. Partridge david.partridge at dsl.pipex.com
Fri Jul 25 01:28:37 EDT 2008

So if Au isn't the thing, what's the better answer?   HASL Sn is the other
common option and I can smell tin whiskers as the counter argument to that.
Electroless Ag?

Don't even think of suggesting regular HASL Sn/Pb - none of the PCB shops
will do that here (RoHS).


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bruce Griffiths
Sent: 24 July 2008 22:51
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] PCB for frequency dividers

Au plating leaves the solder joints vulnerable to the formation of the AuSn
intermetallic compound which will lead to joint failure.
You may need to remove the Au before soldering.

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