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June 2006

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Subject:
From:
"Tempea, Ioan" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Tempea, Ioan
Date:
Wed, 21 Jun 2006 11:28:00 -0400
Content-Type:
text/plain
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text/plain (80 lines)
One is ENIG with no-clean paste, the other one is HASL (with WS paste).

Thanks,

Ioan

-----Original Message-----
From: Lee parker [mailto:[log in to unmask]]
Sent: Wednesday, June 21, 2006 11:26 AM
To: TechNet E-Mail Forum; Tempea, Ioan
Subject: Re: [TN] Blowholes pandemic


Ioan

It may still be a board problem. I would bake some boards and assemble some 
suspect parts. By the way, what board surface finish are you using?

Best regards

Lee

J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389


----- Original Message ----- 
From: "Tempea, Ioan" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, June 21, 2006 8:56 AM
Subject: [TN] Blowholes pandemic


Hi Technos,

for a couple of days I see occurences of blowholes in the joints of, guess 
what, SMT 0603 resistors.

The reflow recipe did not change and we're talking about 2 different 
established products, we have run many of each before. One is WS, the other 
one no-clean. Each one uses different brand of solder paste, SnPb.

I have changed the paste with fresh one, no positive results. I have changed 
the reels with different date codes, Bingo! But even the "bad" parts were 
quite fresh, less than one year old. One of them is pure Sn plated, don't 
know about the other ones.

The question is: where on Earth can humidity stay in a ceramic resistor? 
What else can be the cause of the blowholes? Did not bake the boards, since 
changing the components worked, so I guess the PCBs are out of the hook...

Thanks,

Ioan

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