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Date: | Tue, 13 Feb 96 09:54:12 PST |
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Fred,
We are currently testing most BGA product on 100 mil grids with 3.75" long
pins on a single fixture. However, the need for multiple fixtures (split
nets) is on the rise due mainly to increasing density of BGA's and SMD's
around BGA's. I agree with tbresnan@multek that there is a need for double
density test; on a small but growing scale. We have not yet experimented
with splitting tests between the grid and prober.
Our most significant factor in creating a single fixture is the density of
test points around the BGA. This is coupled with the fixturing software's
ability to efficiently assign all test points to grid.
Regards,
[log in to unmask]
______________________________ Reply Separator _________________________________
Subject: Re: Bare Board Test PCBs with BGAs
Author: [log in to unmask] at corp
Date: 2/12/96 5:25 PM
Fred...
The only strategies available today are the "double-density" BBTesters that give
you an extra pin in the center of the std .100 grid and the "flying probe" type
testers. Most folks today are using a combination test, flying probe in the high
density area of the PWB and standard BBTester for the remainder of the board.
Unfortunately, the testers of the world do not have a single solution for high
volume throughputs.
[log in to unmask]
______________________________ Reply Separator _________________________________
Subject: Bare Board Test PCBs with BGAs
Author: [log in to unmask] at internet_gateway
Date: 2/12/96 3:16 PM
Can anyone share successful Bare Board Test strategies and Equipment
Requirements when
launching into BGA testing? For example: A 19 X 19 array, 1.27 mm pitch, 357
pin, PBGA with 23 mil diameter NSMD solder pads on
a board with two signal, one power, and one ground plane. Can this be done
using a 100 mil grid BBTester? Particularly useful would
be your experience dealing with the obstacles and solutions to unforeseen
problems.
FRED J. PAUL: [log in to unmask] FLUKE CORPORATION
Sr. Process Engineer POB 9090 M/S 55
PCB Operations EVERETT, WA 98206
direct: 206 356-5734 fax: 206 356-6070 Corporate: 206 347-6100
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