I hope that no one inferred from the below message that users actually
have to pay royalties to use SN100C. These are absorbed in the cost of
the alloy. Several factors affect solder prices much more so than the
"royalties" mentioned.  

I'd also like to add that few, if any, of the "competitive" products to
SN100C share its long history in the field.  As Keith wrote, SN100C has
been in use since 1999 and today there are over 2000 lines around the
world running SN100C with more than 500 million boards in service with
no reported service reliability issues.   
 
 
Best regards,
David


-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Wednesday, May 17, 2006 8:10 AM
To: [log in to unmask]
Subject: Re: [LF] SN100C vs SAC305

Dominic,

My choice of solder for wave soldering was SAC305 as that was the
"preferred" alloy at the time of my purchase.  Since choosing SAC305 I
have learned more about what testing was performed to determine SAC305
would be the "preferred" alloy.  SN100C is a patented alloy of Nihon
Superior so when you buy this alloy you will be paying royalties.
Metallic Resources has a competitive product to the SN100C that is not
covered by the Nihon patent and therefore is less expensive.  I have not
yet tried it in the wave, but I am considering switching over and I am
experimenting with cored wire solder of this alloy.

So far, with limited testing in our new wave soldering machine running
SAC305, we are seeing good solder joints.  We are using the Metallic
Resources electrolytic SAC305 with Metallic Resources WS710 OA foam
flux.

Check the archives on mixing alloys.  I think I brought it up within the
last few months due to a concern about CMs using SN100C and our using
SAC305.

Phil

-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Dominic Boudreau
Sent: Tuesday, May 16, 2006 2:20 PM
To: [log in to unmask]
Subject: [LF] SN100C vs SAC305

Hi everyone,

 

We are using SAC for our lead free SMT process but we haven't decided
yet which alloy we will use for the wave soldering process. We were
thinking to use SAC 305 but we heard that some companies have decided to
change to SN100C.

 

What are the pros and the cons to use the two alloys like wave soldering
alloy? 

 

Is there some concerns to have about mixing SAC 305 and SN100C in the
rework?

 

Dominic

 

 


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