Non-collapsing vs Collapsing BGA Balls

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   Hi,
Looking at the tables below, for non-collapsing we use 0.25 (or less) nominal land diameter  for 0.50mm pitch packages. Question is, should 0.30-0.75 ball diameter still applicable for 0.500 pitch packages? Will the land pads not cause any bridging due to space constraints?

Similary, for collapsing we use 0.30 (or higher) nominal land diameter for 0.65mm pitch packages. Question is, should 0.15-0.25 ball diameter still applicable for 0.65 pitch packages? Will the land pads not cause any reliability issues due to smaller pads?

Thanks in advance for your help.

Collapsing Ball

Non-collapsing

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tatets Members Profile Send Private Message Find Members Posts Add to Buddy List Active User Joined: 22 Jul 2013 Status: Offline Points: 29	Post Options Post Reply Quote tatets Report Post Thanks(0) Quote Reply Topic: Non-collapsing vs Collapsing BGA Balls Posted: 10 Jun 2015 at 8:30pm
	Hi, Looking at the tables below, for non-collapsing we use 0.25 (or less) nominal land diameter for 0.50mm pitch packages. Question is, should 0.30-0.75 ball diameter still applicable for 0.500 pitch packages? Will the land pads not cause any bridging due to space constraints? Similary, for collapsing we use 0.30 (or higher) nominal land diameter for 0.65mm pitch packages. Question is, should 0.15-0.25 ball diameter still applicable for 0.65 pitch packages? Will the land pads not cause any reliability issues due to smaller pads? Thanks in advance for your help. Collapsing Ball Non-collapsing



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5949	Post Options Post Reply Quote Tom H Report Post Thanks(1) Quote Reply Posted: 11 Jun 2015 at 7:19am
	Question is, should 0.30-0.75 ball diameter still applicable for 0.500 pitch packages? Question is, should 0.15-0.25 ball diameter still applicable for 0.65 pitch packages? Here is the Ball Size to Pin Pitch table from IPC-7351B:
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tatets Members Profile Send Private Message Find Members Posts Add to Buddy List Active User Joined: 22 Jul 2013 Status: Offline Points: 29	Post Options Post Reply Quote tatets Report Post Thanks(0) Quote Reply Posted: 16 Jun 2015 at 7:09pm
	Thanks a million Tom!