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July 2008

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TechNet E-Mail Forum <[log in to unmask]>, Inge <[log in to unmask]>
Date:
Wed, 30 Jul 2008 10:56:12 -0700
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Hi John,

mobile telephone antenna circuit? No wonder it doesn't work.  It's a 
extremly low capacitance antenna to 'ground', sometimes less than 2pF. And a 
demand for low parasitic currents. You are probably right when you point at 
flux residues. This component should

1. not be  hand soldered
2. be maximum cleaned

My 2 pF

Inge



----- Original Message ----- 
From: "John Anselmo" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, July 29, 2008 2:08 PM
Subject: [TN] Ceramic Varistor Test Failures


Dear All,

We have been seeing an increase in test failures of the ceramic varistor 
(AVX P/N VC060314A300) when these components are near a connector that we 
hand solder.
I suspect it is contamination from the flux used for hand solder.  We fix 
the test failure by resoldering the varistor, and all is well at retest.
We do a water wash after hand solder, but still see a 20% to 40% test 
failure rate.  Has anyone experienced this before?  Waht was done to fix the 
problem?

Thanks in advance for the help.

John Anselmo
Manufacturing Engineer
S&K Electronics, Inc.

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