Mark:
The only high temp solder we have used is Au-Sn (Tm = 280 C), but break out
your VISA card since it has 80% gold.
Bob

-----Original Message-----
From: Mark Mayer [mailto:[log in to unmask]]
Sent: Thursday, August 26, 2004 9:49 AM
To: (Leadfree Electronics Assembly Forum); Hilty, Robert D
Subject: RE: [LF] High Lead Solders with SAC


Anyone have experience with replacing high lead content solder with
lead-free?  We use a Sn30/Pb70 alloy (melts at 245C)for a part that is
overmolded with polyurethane.  We need the high melt temperature because the
injection temperature of the polyurethane is 232C.  Most of the lead-free
alloys I've seen melt between 217C and 227C which may be a problem for us in
the molding process.

Mark Mayer, PE
Senior RF Engineer
Centurion Wireless Technologies
3425 N. 44th St.
Lincoln NE  68504
(402) 325-3262 (direct)
(402) 325-3200 (main)
www.centurion.com


-----Original Message-----
From: Hilty, Robert D [mailto:[log in to unmask]]
Sent: Thursday, August 26, 2004 6:43 AM
To: [log in to unmask]
Subject: [LF] High Lead Solders with SAC


Is anyone aware of any reliability studies performed on high melt
temperature high lead content solders (85-90%Pb) in conjunction with
tin-silver-copper coatings or PCB finishes?  I suspect that the tin rich
coating will decrease the solidus and liquidus temps of the resulting solder
volume, but I don't know the reliability effect of that reduction or if
there are confounding issues with silver or copper contamination.

Cheers,

Bob Hilty
Tyco Electronics

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