Stats

  • Locked Locked
  • Replies 6
  • Subscribers 164
  • Views 4108
  • Members are here 0
More Content
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

0.5mm BGA - tracking - via criteria?

archive

Does anyone have a recommended rule set for tracking out of a .5mm BGA. Its only the two outer rows that are used.  I'm trying to find manufacturers recommendations but so far no joy.

Specifics.

Would you use microvias to escape from the 2nd row, or go between the outer pads on the 'top' layer?
What is the recommended pad size?  (ball dia = .25-.35) but theres nothing about the 'pad' size on the bga which connects the ball.

Thanks..


Originally posted in cdnusers.org by cartouche

  • Yeah, we've found that 3 mil lines/spacing is preferred (i.e. cheaper) than micro-vias. This is especially true in high-volume production overseas. As micro-vias become more prevalent, that may change.

    At first, I was reluctant to use them (I thought it would be more difficult to design with them), but after doing umpteen boards with micro/blind/buried vias, I practically beg marketing to let me use them.


    Originally posted in cdnusers.org by dgstan
Cadence Guidelines

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.