Hi Steve: If you have an 8 mil opening a "good" fabricator should be
able to do it. They typically they would like a minimum clearance of 2.5
mils per side which would leave a 3 mil strip of mask.

It's not guaranteed it will always be there. Occasionally they will get
blown out. Also due to undercut you'll find the base of the mask
narrower than 3 mils.  


	
Regards
	
Michael Barmuta
	
Staff Engineer
	
Fluke Corp.
	
Everett WA
	
425-446-6076  

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Monday, February 12, 2007 9:11 AM
To: [log in to unmask]
Subject: [TN] LPI soldermask resolution

Mornin' All!
 
What kind of resolution should a LPI be able to give you? Specifically,
LPI's should be able to give you a solder mask dam between 20-mil pitch
leads if you have 8-mils of space between the pads shouldn't it?
 
Thanks!
 
-Steve Gregory-

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text
in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at:
http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------

This message (including any attachments) contains confidential 
and/or proprietary information intended only for the addressee.  
Any unauthorized disclosure, copying, distribution or reliance on 
the contents of this information is strictly prohibited and may 
constitute a violation of law.  If you are not the intended 
recipient, please notify the sender immediately by responding to 
this e-mail, and delete the message from your system.  If you 
have any questions about this e-mail please notify the sender 
immediately. 

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------