Yes Sn96 has been used for decades as a higher temp alternative to Sn63/Sn62
especially in hybrid thick film apps.
The addition of Cu does drop melting temperature 4C from 221 to a notional
217C, the addition also improves the alloy properties of the solder as a
solder and in life cycling. Joint properties on ENIG are subject to the same
problems as SAC.
Regards
Mike Fenner
Indium Corporation
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Macconnell, Richard (ES)
Sent: Friday, September 22, 2006 4:32 PM
To: [log in to unmask]
Subject: Re: [TN] Soldering with Sn9,5Ag3,5
Arnaud:
We use Sn96 (referred to as high-temp solder) in processes where there are
two soldering operations. Sn63 solder is used in the first operation,
followed by the Sn96 in the second. This avoids reflowing the Sn63 during
the second soldering.
I don't know enough about soldering to be able to answer Juan's question.
But, if the intent is to solder the tinned wires to the board, isn't some
melting of the SnPb coating on the board required? If so, why use a
high-temp solder? Switching to ENIG gets around that issue.
Rich.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of arnaud grivon
Sent: Friday, September 22, 2006 6:20 AM
To: [log in to unmask]
Subject: Re: [TN] Soldering with Sn9,5Ag3,5
Could anybody on the TechNet planet tell me the primarily reasons for using
this Sn96,5Ag3,5 solder alloy?
It looks like this alloy has been already in use for some years as solder
wires and solder paste for small electronic modules.
Also, I seem to remind that this was the first alloy of choice for lead-free
BGA spheres before the industry consensus for SAC.
Why did the industry switch to SAC instead of SnAg? In other words, what
does the copper bring?
A. Grivon
Juan T. Marugán a écrit :
> Hi,
>
> in a Class 3 product (aerospace) we have to solder some wires to a PCB
> using a Sn96,5Ag3,5 solder alloy. Wires are silver coated,
> high-strength copper alloy and the PCB is SnPb plated.
>
> My first question is, Do you consider that solder alloy as a good option?
>
> Besides, in a near future, we will change the finish of the PCB from
> SnPb to ENIG. In that situation, what solder alloy do you recommend us?
>
> Thank you in advance.
>
> Juan T. Marugán
> Production QA
> Indra Sistemas SA
> Spain
>
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