[SI-LIST] Re: 0.8mm BGA routing
- From: "Vincenzo Kreft-Kerekes" <vincenzo@xxxxxxxxxxxxxx>
- To: "Stephen Chavez" <stephen.chavez@xxxxxxxxxxxxxxxx>
- Date: Fri, 26 Dec 2003 12:17:42 -0500
Steven,
How large was the pad you used for the ball? I've seen a recommended value
of 0.33mm (13 mil) diameter and can't seem to fit anything larger than a 10
mil escape via (20 mil via pad) at 5/5 (or 6/6) mil track/space so how did
you achieve your 12 mil via? Doing the numbers you seem to have used 0.27 mm
(10.5 mil) for the ball diameter and I'm wondering whether that's on the
edge of yields/reliability for 0.8 mm BGAs because I'm facing a large
premium going from 12 to 10 mil vias. Please let me know what you think when
you have a chance. Thanks a lot.
Regards,
Vincenzo
-----Original Message-----
From: Stephen Chavez [mailto:stephen.chavez@xxxxxxxxxxxxxxxx]
Sent: Wednesday, December 24, 2003 9:14 PM
To: tayyab@xxxxxxxxxxxxxx
Subject: RE: [SI-LIST] 0.8mm BGA routing
Tayyab,
I just finished a design with a 896 pin BGA (Xilinx) with 0.8mm pitch. I
used 5mil trace width, 5mil spacing and Via: 24mil pad with 12mil hole. I
have done the research and this is what Xilinx recommended. It works fine. I
have designed with this configuration on a 10 layer board. I have even went
down to a Via with 20mil pad and 10mil hole. This worked fine also. I
checked with my board house to confirm this before I started my design. Feel
free to get back to me if you have any questions. Good luck.
Regards,
Stephen V. Chavez
PCB Designer
Vista Systems
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Tayyab Jamil
Sent: Wednesday, December 24, 2003 4:50 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] 0.8mm BGA routing
Hello,
I am currently working on a design where a 0.8 mm pitch BGA package is used.
Can any one suggest me the design configuration i.e trace width/spce and
specially the via size and via hole, which i should follow and manufacturers
can handle this.
Regards
Tayyab Jamil Qureshi
Sr. Design Engineer
CARE Pvt. Ltd.
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