Lurk = off
I use a .56mm  pad, and .088mm trace / space. (5 X .088mm = .44mm)   (.44mm 
+ .56mm = 1mm)   I use the finer line width to get close to 50 ohms. (45 
ohms on my calc.).     It is much easier to design in metric, place your 
parts on grid, snap your vias to grid, also place the 0402 bypass opposite 
the bga (on grid).     It is easier for the manufacturer if you make the 
line width smaller, than the space also they can then expand the trace and 
etch it back without a problem meeting your requirements.
Lurk = on


From: "Brionez, Gregory" <[log in to unmask]>
Reply-To: "(Designers Council Forum)" <[log in to unmask]>,             
  "Brionez, Gregory" <[log in to unmask]>
To: [log in to unmask]
Subject: [DC] Via Specification
Date: Tue, 15 May 2007 06:06:48 -0500

Karl - I know you are lurking.

I need to specify a via for a 1mm BGA. We use to do these a lot at
Tellabs.

My gray matter deceives me.

Anyone please let me know what you are using for .063, .093 thick PCBs.

Thank for all replies.



Paul Brionez - CID +
[log in to unmask]
PCB Designer
PH: 847-673-2718 x1394
FAX: 847-673-9789
DIVISION: Electronic/Systems

MPC Products Corporation
<http://www.mpcproducts.com/> ISO 9001 Certified
Skokie, IL USA








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