Yup, I remember way back when, close to 30 years ago, when I was
assemblin' boards an components with tin-plated leads. Easier to plate
the tin on in some cases than solder...
Regards,
Roger
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
(AZ75)
Sent: Tuesday, November 01, 2005 4:22 PM
To: [log in to unmask]
Subject: Re: [LF] Matte Tin Lead Finish in Good old SnPb Joints
I hate to dash your allusions, but unless you have more than a dotted
line responsibility to code your products you have been soldering Matte
Tin finished parts with a Tin-Lead process for years now.
Dewey
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Morse, Carrie
Sent: Tuesday, November 01, 2005 1:19 PM
To: [log in to unmask]
Subject: [LF] Matte Tin Lead Finish in Good old SnPb Joints
OK, OK....Put the Guns Down....(especially if they have leaded bullets!)
I have a customer asking about the reliability of a solder joint that
would be made using a component finished in Matte Tin but, soldered
using SnPb.
His concern is that Tin has a melting point of 217C yet, most SnPb
process target a Max Temp of 210-225C.
Hasn't Tin been used for years on components? Has this always been an
issue? Or, is this new?
Is it an issue? Do we need to increase our profiles to be above 217C
for some period of time? If so, what IS that time and what IS that
temp?
Any metallurgists/process folks want to give their 5 cents worth
(yes...it's no longer 2 cents -- the price has gone up to keep in line
with the new cost of our new and improved solder pastes!)
TIA,
Carrie
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