In response to your questions: 1) Suggestions on substrate material FR-4 or something better?
Most PBGA are on BT. That might good for you, also.
2) Are there design guidelines for wire bonding pattern on the substrate?
Several things: 1 Doesn�t your CAD program puke-out wire bond pads? If not, it might be a worthy option to purchase. Bond finger pitch: 4/4 thou [0.1/0.1mm] 5/3 thou [0.125/0.75mm] Trace width/space: 4/4 thou [0.1/0.1mm] Via diameter: 12 thou [0.3mm] 2 The decision to wire bond er to ball bond is not trivial. John Lau covers the topic in recent FC books. 3 IPC has issues about 17 documents named Fred orzit "Implementation of Flip Chip and Chip Scale Technology". If you figure how to tell one from the next, please help.
Finally, I think the plural of die is dice. Yano, the same ideal as mice and meeces.
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