IPC-SM-782 released
in 1987 and was active for 18 years, had Level B as the default Zero Component
Orientation . PCB Libraries, Inc. created the first Land Pattern Calculator in
2001 using Level B Zero Component Orientation for both IPC-SM-782 and the new
IPC-7351 standards. Then in 2005 the
IPC-7351 committee had one meeting at IPC APEX in Anaheim, CA that changed the
Zero Component Orientation to Level A. So PCB Libraries updated LP Wizard to
match the new Level A Zero Component Orientation.
Then in 2007 IEC in
Europe released a new Zero Component Orientation standard IEC 61188-7 with
Level B as the world standard. LP Wizard stayed with Level A Zero Component
Orientation because of IPC-7351.
The new Library
Expert now defaults to Level B Zero Component Orientation because IPC-7351C
will introduce it to be compatible with both IPC-SM-782 and IEC 61188-7. However,
Library Expert users can change the Zero Component Orientation to whatever
Orientation they want in User Preferences.
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