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February 1999

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Subject:
From:
Cory Olijnek <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 24 Feb 1999 15:19:30 -0600
Content-Type:
text/plain
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text/plain (31 lines)
To: Technet
I am wondering if anyone has found errors in the IPC SM782 LAND PATTERN
CALCULATOR.  I feel that there may be a calculation error in
the land patterns for the TSOP, MT48LC1M16A1TG-10S,MICRON part.
The minimum Toe fillet (Jtmin) is defined as 0.005 mm, and the minimum Heel
filet is defined as 0.01 mm.   This seems to be exceptionally small.

Also the Y ref given for the pad is 0.751mm. The resulting pad is quite
small and difficult to solder to.(We found it extremely difficult when
using these dimensions on a prototype board.)

If anyone has had the same problem or a similar one with land pattern
dimensions
from this calculator, please drop me a line.

Thanks,

Cory Olijnek,     [log in to unmask]

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