Paul,
I'm also on the Mentor PCB sig, and this email just came across last week.
I used a 20 Top, 24 internal pad, 8 mil finished hole for the dogbone via
(this
allows 5 mil trace / space). And I followed Mike Schatz's recommendation
for the
bga pad size.
Karl
Hello Joaquin...
For 1mm BGA's we use a 19mil (.48mm) pad, 23mil (.58mm) solder mask, 20mil
(.5mm) solder paste.
HTH...
Mike Schatz
Development/Layout Engineer, Mentor Librarian, all-around good guy (ô¿ô)
Micron Technology, Inc.
Integrated Technology Group - Logic Products Group
8455 W. Emerald St. - M/S 540
Boise, ID 83704-8306
Phones:
Work: (208) 363-5524 FAX: (208) 363-5596
Pager: (208) 368-5000 PIN: 7072615#
Cell: (208) 890-5374
Web Sites:
Work: http://hercules.micron.com/ipg/
Private: http://www.webpak.net/~mschatz/
o "Birth...the leading cause of death." -B.C. January 13, 1997
o "A fine is a tax for doing wrong. A tax is a fine for doing well."'
o "Don't ever slam the door; you might want to go back. - Don Herold"
-----Original Message-----
From: Joaquin Ullan [mailto:[log in to unmask]]
Sent: Thursday, February 22, 2001 4:23 AM
To: [log in to unmask]
Subject: BGA pads
Hello friends, I need a urgent solution for a question please.
I have to use a BGA64 package (pitch 1mm) in my new design. The
diameter of their solder balls is 0.4-0-6mm. Please, if I use a
footprint wiht pads of 0.6mm of diameter, is this correct?, have they to
be smaller?, bigger?.
Thank you very much for you help
Joaquin
--
Joaquin Ullan Martorell (mailto:[log in to unmask])
Tecnico de Desarrollo - Diseño pcb's / PCB Designer
Trend Communications, S.L. - http://www.ict.es
http://www.trendcomms.com
Tel: (+34) 93.300.33.13 - Fax: (+34) 93.339.23.85
-----Original Message-----
From: Paul Brionez [mailto:[log in to unmask]]
Sent: Tuesday, February 27, 2001 9:41 AM
To: [log in to unmask]
Subject: [DC] Breakout
Hello Everyone
Just wanted to know if anyone has had to breakout a 1156 pin BGA with a
pin pitch of .1mm on a 20_Layer Board.
Thanks in Advance
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