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September 2015

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Subject:
From:
Steve Gregory <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steve Gregory <[log in to unmask]>
Date:
Wed, 23 Sep 2015 08:11:08 -0600
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text/plain
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text/plain (46 lines)
Morning All,

I've just had a problem that I've seen before, but when I seen this in the
past it was with Tin/Lead soldering, this time it's with Lead Free SAC
soldering.

We're building a board for a customer and one of the caps called out is TDK
PN# CGA3E2X7R1H472K080AD. It's a cap made for conductive epoxy and has
AgPdCu terminations. Well I missed it in the BOM and we've already built
the boards. It was brought to my attention that our rework operator was
having trouble getting the caps to solder and wanted me to take a look at
them. As soon as I seen them I went; "Oh crap..." and then pulled up the
datasheet to verify my suspicions. Here's a photo of the cap:

http://stevezeva.homestead.com/TDK_AgPdCu.jpg

So I made the call that the caps needed to be replaced, with a more
suitable cap like this AVX PN# 06035C472KAT2A. It has a Tin-Nickel
termination and has a X7R dielectric, and is also 4700pf +/- 10%. Some of
the existing caps have solder wet to them, but the solder joints are very
minimal. Knowing how bad these leach I'm leery about leaving them on the
board. Should they be left on the board if they have a minimal solder
joint? The ones that have not wet cannot be touched-up, as soon as you hit
them with a soldering iron the termination dissapears.

Right now we're waiting on the customer to approve the AVX cap.

Steve

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