Why Wide Fine Pitch Pads?
Published: |
May 7, 1999 |
Author: |
Rick Lathrop, Heraeus SMT Technical Services |
Abstract: |
Fine pitch SMT devices, although certainly not new, present more of an assembly processing challenge than 50 mil pitch devices. In fact it seems that the finer the pitch the more difficult or narrower the process window becomes. Besides the pitch of the leads being less on fine pitch devices narrower pad width on the board is typical. With fine pitch designs the board fabrication process is also stressed in that the strip of mask between the pads is designed narrower, the alignment of the mask to copper becomes more critical... |
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