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September 1999

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Subject:
From:
Grant Emandien <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 3 Sep 1999 12:37:41 +0200
Content-Type:
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text/plain (39 lines)
Hi All,

We have received some boards with 1206 caps placed (beautifully I might
add!) on 0805 pads. Hence only the base of the rectangular-end terminations
are soldered i.e. no fillet meniscus on the end terminations. The
terminations do not appear to overhang the pads and hence the whole bottom
surface area of the terminations is bedded on the soldered pad (it covers
about half the pad area). We have done a min/max tolerance exercise on the
1206 caps - max tolerance may result in overhang.

Is the integrity of the joint affected?

Any other factors to be considered?

J-STD-001, class 2 gives a maximum and minimum fillet height but not the
area of the fillet. As per Table 9-5, dimensions A, B, C, D, F, G nor J
appear to have been compromised.  Or do I view the situation as an overhang
problem only, if overhang is compromised? The qty of boards affected is
small - is it best to rather inspect for overhang?

How do I interpret dimension J in Table 9-5 of J-STD-001?

Thanks
Grant

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