For sure you don't want bright and shiny nickel as you have. A good rule of
thumb:

Things that stay bright and shiny are hard to solder. 

Exception: Gold

-- 
Regards 
 
Mike 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Friday, October 30, 2015 12:10 AM
To: [log in to unmask]
Subject: Re: [TN] No-wetting on Mini USB (Nickel plating)

Deng,
I suggest if you have the time, get the supplier to provide you connectors
with a tin or solder plating already on the connection pins.  

About a decade ago almost lost my job over these suckers.  Told my boss that
the USB connectors were bare nickel and he brushed it off and we had
terrible field problems as a result.
Bev
Blackberry

Opinions expressed are my own and may not represent those of the company I
work for.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Deng RongJun
Sent: October 29, 2015 3:33 AM
To: [log in to unmask]
Subject: [TN] No-wetting on Mini USB (Nickel plating)

Hi Technetters

I have got a problem with a SMT type mini USB connector. The four pins
contacted shield are no-wetting after reflow soldering.  But can be solder
well by iron.
The pins only plated by Nickel, is it possible the oxidation film creating
on pin surface and then affect soldering? 

Picture:
https://goo.gl/photos/qap1CBEWzUEJEc5i6

Thanks in advance.
 
RongJun Deng


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