Phosphor bronze is used for millions of different types of connector
receptacles and mating pins. It is also the basis metal for many of the
header pin components.
It does not solder very well by itself, it requires a nickel plate to
solder to. Usually the phosphor bronze pins are nickel plated and then
flash gold is plated on top of the nickel. When you solder to them, the
nickel dissolves into the solder alloy, and the solder alloy then forms
an IMC with the nickel underneath. Usually this is a very reliable
connection provided the nickel is the right thickness and the gold is
very thin. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Friday, August 18, 2006 8:26 AM
To: [log in to unmask]
Subject: [TN] Solderability of phosphor bronze

Hi Technos,

if we're talking dissolution and all the big guns are here, I have a
question:

should I worry about the solderability of Au plated, phosphor bronze
pins?

I mean the bronze is CuSn, and it should have no dissolution issue so
this connector should practically solder as good as the MLCCs. In no
circumstance should this part solder harder than a QFP, for instance.
The only issue might be the gold plating. Am I right?

Thanks,

Ioan

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