|
|
1 mm Pitch BGA Courtyard - Nominal Density Level |
Post Reply 
|
| Author | |
5not4 
Active User 
Joined: 09 Jul 2013 Status: Offline Points: 40 |
 Post Options
 Thanks(1)
 Quote Reply
 Topic: 1 mm Pitch BGA Courtyard - Nominal Density LevelPosted: 24 Aug 2015 at 5:55am |
|
Hi Tom.
Is any history available for the courtyard clearance when using the old LP Calculator? For 1mm pitch BGA's it is creating a 2mm clearance for courtyards and everything that I can find within IPC7351B is stating 1mm is needed for nominal patterns. I have a feeling it is protecting for the component fiducials. I apologize in advance if this is off-limits. LP Calc is still our main tool with the Library Expert as a second opinion/reference tool.
|
|
 |
|
|
|
|
Tom H
Admin Group 
Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5718 |
Post Options
Thanks(0)
Quote Reply
Posted: 24 Aug 2015 at 7:40am |
|
The IPC-7351 standard has been downgraded to a Guideline.
 You can use whatever Courtyard Excess you want based on if you ever "Rework" bad BGA's. If you do then you need extra clearance. How much clearance depends on the assembly shop's need for rework space. If you don't rework, the courtyard can be 0.50 mm, but in Library Expert it's a User Preference for every Ball Size. |
|
|
|
|
5not4
Active User
Joined: 09 Jul 2013 Status: Offline Points: 40 |
Post Options
Thanks(0)
Quote Reply
Posted: 27 Aug 2015 at 5:22am |
|
Thanks, Tom.
We had found one of your previous (MG) Blogs and you had stated this similar thing in reference to rework/no rework clearances.
|
|
|
|
|
Post Reply
|
|
| Tweet |
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Topic Options