[PCB_FORUM] Re: package spacing

You could try the Designers Council maillist.  Sign up at 
http://www.ipc.org/ContentPage.aspx?Pageid=4.3.16

We use larger spacings than that, Rachel.  It depends on your repair
strategy and the nozzles available to unsolder the parts.  Your previous
employer may have had different  machines to rework those parts.

-- 
George Patrick
Tektronix, Inc.
Central Engineering, EDS Applications Support
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
* 503-627-5272 (voice)     * 503-627-5587 (fax)
http://www.tektronix.com    http://www.pcb-designer.com
 
"Off-Grid and Proud of it!"


-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Rachel Bremner
Sent: Thursday, November 02, 2006 16:54
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] package spacing


Hi All,

We use a .150 keepout around bga's for rework, but also for qfn's (.250 
square device 19 mil pin pitch). My previous company did not use such a 
large keepout for qfn's. It was 50 mil package to package as opposed to
150. 
It seems this large rework keepout cancels out the benefit of using a
small 
package. What are others using as their place bound?

Is there a pcb forum that is not specific to Allegro that anyone uses
for 
general questions? It seems most of the ones I've found are not well 
attended and have few recent postings.

Thanks,
Rachel

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