PCB Libraries Forum Homepage
Forum Home Forum Home > Libraries > Footprints / Land Patterns > Expedition
  New Posts New Posts RSS Feed - Mask opening for 0201 parts
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Mask opening for 0201 parts

 Post Reply Post Reply
Author
Message
Nightwish View Drop Down
Active User
Active User
Avatar

Joined: 20 Feb 2012
Location: Shanghai China
Status: Offline
Points: 33
Post Options Post Options   Thanks (0) Thanks(0)   Quote Nightwish Quote  Post ReplyReply Direct Link To This Post Topic: Mask opening for 0201 parts
    Posted: 28 Apr 2012 at 12:08am

Hi Tom,

Our DFME suggest that the mask should be removed from the gap between two pads for 0201 components. What do you think about this?
 
Thanks,
 
Nightwish
Back to Top
Tom H View Drop Down
Admin Group
Admin Group
Avatar

Joined: 05 Jan 2012
Location: San Diego, CA
Status: Offline
Points: 4571
Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 28 Apr 2012 at 3:25pm
Yes, Gang Mask is used when the solder mask sliver is less than 3 mils. i.e.: it's better to have no solder mask than a fine line sliver. I have never heard of assemly solder problems due to no solder mask.
 
As a matter of fact, I've worked on many RF and Space Satellite boards that did not have any solder mask. But these get tricky because the solder will start to run down the trace during reflow when there is no solder mask.
 
But for your application, removal of solder mask between pads is common.
 
Back to Top
Nightwish View Drop Down
Active User
Active User
Avatar

Joined: 20 Feb 2012
Location: Shanghai China
Status: Offline
Points: 33
Post Options Post Options   Thanks (0) Thanks(0)   Quote Nightwish Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 2012 at 8:00pm
Hi Tom,
 
Thanks for your suggestions and we already remved the mask between the pads. When the DFME check the board using Valor, the mask less than 3mil will reported as a silver error and this  is also one of the reason we decide to remove the mask.
 
Thanks,
 
Nightwish
Back to Top
 Post Reply Post Reply

Forum Jump Forum Permissions View Drop Down



This page was generated in 0.047 seconds.