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May 2014

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Subject:
From:
Robert Kondner <[log in to unmask]>
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Date:
Fri, 30 May 2014 15:45:16 -0400
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I agree, I thought flux when I was the image.

Question:

 If it was RMA flux what kind of failures can that flux reasonably lead to?
(Sorry for the Lead pun)

Thanks,
Bob K.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Friday, May 30, 2014 2:46 PM
To: [log in to unmask]
Subject: Re: [TN] Component Lead Oxidisation

I cannot say for absolute certainty from just looking at the pictures, but
it sure does look like RMA flux deposits from the tinning process that were
not washed off completely. I can see the line of demarcation where it
appears the tinning solder stopped just behind the flux.
Because the flux rides up the component lead when the component is immersed
into the molten solder, it tends to collect at the inside bend of the lead
of ICs like this. 
For mission critical applications, I would be concerned. 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Friday, May 30, 2014 1:34 PM
To: [log in to unmask]
Subject: Re: [TN] Component Lead Oxidisation

Hi Wee Mei,

I just want to apologize for not getting this posted sooner. I first saw
your message on my phone and then got distracted by a bunch of other things
and just forgot about getting your photos posted until you asked me about
them.

I have them posted now:

 http://stevezeva.homestead.com/WeeMei_1.jpg

http://stevezeva.homestead.com/WeeMei_2.jpg

Is this a ceramic part? It looks like to me that some of the part
encapsulate bled out beneath the lead shoulder and the lead did not get
plated.



Steve 


-----Original Message-----

Steve,

I was looking at a batch of lead-formed part and noticed oxidisation or
whatever you call them at the junction of the leads and component body.
This oxidisation is only found at the bottom side of the component. I look
at the raw part (before the leads are form) and found some of them having
the same issue. I need your assistance to post this file for the following
advices.

1) If this is not oxidisation, what is the correct term for it?
2) How serious is this "oxidisation" as the parts are used in mission
critical operation.
3) What is the cause of such "oxidisation"?

Regards,
~wee mei~
 

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