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August 2000

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Subject:
From:
"Leonovich, Mike E." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 2 Aug 2000 14:40:40 -0400
Content-Type:
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Hi,

I've been trying to determine IPC specs for a particular Hot Air Solder
Leveling "defect".  Below is a electronic photo of the defect.



 <<...OLE_Obj...>>

This "defect" is called a solder tail, and I'm trying to determine when it's
actually a defect and why.

I know that if the "tail" stretches and contacts another annular ring, then
it's defective because of bridge or short.

If the surface plane of the annular ring is compromised by the excessive
solder at the base of the tail, then it's defective because the annular ring
needs to have a smooth even surface for the assembly of the surface mount.

Other than these issues, is there any other reason why this "tail" would be
defective?  If the presence of the tail doesn't create an uneven surface for
the annular ring, and if the tail doesn't contact any other features it
should be acceptable, right?

I appreciate whatever help you could give me.

Thanks.

Mike.

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