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June 2013

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Subject:
From:
Ed Popielarski <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ed Popielarski <[log in to unmask]>
Date:
Thu, 6 Jun 2013 20:06:17 +0000
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Phil,

This is "new build" although not built by my company. They are post-plated min. 40u" (1.02 microns) matte tin (lead free) over min. 80 u" (2.04 microns) nickel. The tin plate over nickel is probably reflowing during wave/selective/hand soldering to the PCB, but I don't know this for certain as I've not observed it personally, only the end result.

Ed Popielarski
Engineering Manager


                               970 NE 21st Ct.
                              Oak Harbor, Wa. 98277

                              Ph: 360-675-1322
                              Fx: 206-624-0965
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-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]] 
Sent: Thursday, June 06, 2013 12:46 PM
To: TechNet E-Mail Forum; Ed Popielarski
Subject: RE: Dewetting on high current connector

Hi Ed,

Was this a solder coated blade connector?  Dewetting normally applies to something that has been exposed to solder and I am not sure why a connector would get a soft metal (solder) finish.  Is this a field return (can't tell if I am seeing corrosion) or freshly produced item?

Phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ed Popielarski
Sent: Thursday, June 06, 2013 12:00 PM
To: [log in to unmask]
Subject: [TN] Dewetting on high current connector

Greetings fellow 'netters,

I have discovered a dewetting condition on high current blade connector(s) which causes me to raise an eyebrow. I can't find any scholarly articles discussing the long term effect such an irregular surface at the material contact interface (photo located at http://stevezeva.homestead.com/Terminal_de-wetting.JPG ) will have on connection integrity at high current. This is an extreme environment automotive application with MTBF expectations in excess of 10 years.

Any guidance and/or professional opinions would be greatly appreciated.

As always, thanks to Steve G. for sharing his webspace with us!

Ed Popielarski
Engineering Manager

[Description: FullLogo]
                               970 NE 21st Ct.
                              Oak Harbor, Wa. 98277

                              Ph: 360-675-1322
                              Fx: 206-624-0965
                              Cl: 949-581-6601

https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&spn=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A


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