Well that depends...
For discrete components such as resistors etc that is a correct
statement, however many of the IC's have needed to change packaging
material to meet the higher temperatures of SAC.
eric
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Monday, September 18, 2006 2:28 PM
To: [log in to unmask]
Subject: Re: [TN] Lower temp soldering pass of lead-free boards
Hi Ioan!
Are you sure that things are really different between the "Leaded" and
"Lead-free" parts besides the plating? We were in a situation where we
had to build a consigned material assembly which is in the process of
becoming "compliant". However, our customer had purchased quite a number
of digital video devices and did not want to throw them away because
they weren't PB free...the assemblies that we were building weren't
going to the EU.
But we were using PB free solder paste and had some concerns about
whether or not the leaded parts would be able to withstand the lead-free
temperatures. So we called the manufacturer of the device inquiring if
the part could take the heat, and was told "unofficially" (like if we
repeated what he said he would deny it) that the only difference between
the lead-free and leaded part was the plating on the leads...nothing had
changed internally.
I wonder how many PB free parts REALLY have something different about
them besides the lead plating?
-Steve Gregory-
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Monday, September 18, 2006 11:26 AM
To: [log in to unmask]
Subject: [TN] Lower temp soldering pass of lead-free boards
Hi Technos,
I have a lead-free board, but some nasty leadless comps are only
available leaded, so not supporting 240C.
I am thinking what about soldering everything that works at lead-free
temps and then make another soldering pass at about 210C with these
comps only. Will this affect the reliability of the lead-free joints,
since the solder will get almost pasty? Did anybody try this?
I agree with the ones that will say: "what the heck, they cannot give
you compliant parts, don't do it", but it is an important project, the
customer knows what this means, but they want to risk.
Btw, I have to make sure the original reliability of the lead-free
joints, as good as it is, will not be latered, it is a high-rel
application.
Thanks,
Ioan
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