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May 2014

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Subject:
From:
Wayne Thayer <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Wayne Thayer <[log in to unmask]>
Date:
Mon, 5 May 2014 12:15:23 +0000
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This was common practice in the days before SMT.  The masks used at the time
would ripple where the tracks were reflowed, but didn't crack.  Still made it
through the solder wave just fine, and no problem with hand soldering either.
I sometimes still see this today with single sided wave soldered boards such
as cheap consumer audio and power supplies.

"Correct" is what works for your application.  Inherently, there is no
reliability issue with this construct.

Wayne Thayer

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ramakrishnan Saravanan
Sent: Sunday, May 04, 2014 4:18 AM
To: [log in to unmask]
Subject: [TN] Solder Mask over Tin Lead Plating

Hi,

We received few PCBs from an European PCB manufacturer for Aerospace Industry.
I am surprised to see Solder Mask is applied over tin lead plated tracks. My
understanding is if u do reflow , the solder under the mask will melt and
affect the mask. The correct method is applying Soldermask over bare copper
isn't?. Kindly advise. regards,

R.Saravanan

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