Square Masks on Round Pads
Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Product Suggestions
Forum Description: request new features
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=1104
Printed Date: 22 Nov 2024 at 12:20am
Topic: Square Masks on Round Pads
Posted By: kwgilpin
Subject: Square Masks on Round Pads
Date Posted: 10 Sep 2013 at 7:41pm
|
Some BGA manufacturers call for square solder and paste masks on top of round pads. Can you make these independent options for both standard components and components created with FP Designer? Thanks, as always, Kyle |
Replies:
Posted By: Tom H
Date Posted: 11 Sep 2013 at 7:41pm
|
You can do this in FP Designer.
Create your BGA in the Calculator and then convert it to FP Designer. Then select the Pad Stack editor and change the Paste Mask from Round to square with rounded corners. ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |
Posted By: Nightwish
Date Posted: 12 Sep 2013 at 1:05am
Our DFME suggest to set the solder paste to Round Rectangular shape instead of a round one. The picture below can show the padstack for BGA in our library. The blue round shape is pad and yellow one is solder mask. The Rnd Rec shape in green is solder paste. |
Posted By: kwgilpin
Date Posted: 13 Sep 2013 at 1:37pm
|
Hi Tom, Sorry for the slow response. The part in question in STMicro BAL-NRF01D3: http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00055606.pdf" rel="nofollow - http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00055606.pdf Thanks, Kyle |
Posted By: caclark
Date Posted: 12 Nov 2013 at 9:47am
|
Our Surface Mount SME also prefers slightly over-sized square paste on round BGA pads (been doing it for several years to all BGA packages with a pitch of 50 or less). We have seen a dramatic improvement on stencil release and pad to ball adhesion during reflow. |