[SI-LIST] Re: BGA sockets or a source of compression type material

Hi Nick,
The Pariposer does not need to be made to package size either, I buy it in 
2inch by 2 inch squares similar to the ShinEtsu.... The ShinEtsu material I 
have fried wires on when I haven't contacted enough of the thin conductors so I 
still prefer the Pariposer silver plated balls that conduct even when an oxide 
layer forms.

Regards,
Heidi

-----Original Message-----
From: Nick Langston [mailto:nick@xxxxxxxxxxxxxxxxxxxx] 
Sent: Tuesday, February 17, 2009 7:55 AM
To: Barnes, Heidi; 'David Greig'
Cc: 'SI-LIST'
Subject: RE: [SI-LIST] Re: BGA sockets or a source of compression type material

Heidi,
You're right elastomer like Pariposer or the low cost PCR from RD Circuits are 
an excellent choice for hi frequency hand test.  There are probably a dozen 
suppliers that have 40GHz+ elastomer sheets, but only the ShinEtsu is 
http://www.shinpoly.com/products/interconnectors/ doesn't have to be made 
custom to the package and therefore would be lowest cost.  You're right, it is 
a problem if you have solder plated pads or solder resist or any contamination. 
 A low cost socket with the ShinEtsu could be had from Ironwood Electronics 
www.ironwoodelectronics.com and a good low cost socket with 4GHz pogo pins 
(~$500)(Low cost being relative) can be had from www.contechsolutions.com Clear 
skies.
Nick

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of Barnes, Heidi
Sent: Monday, February 16, 2009 6:11 PM
To: David Greig
Cc: SI-LIST
Subject: [SI-LIST] Re: BGA sockets or a source of compression type material

Hi Greig,
My favorite has always been Paricon Ball Wire vertical interconnect PariPoser 
material for minimal performance difference from that of a soldered down part 
at high frequencies.  www.paricon-tech.com I am usualy dealing with a variety 
of parts and minimal lead time for custom sockets so having the ability to just 
lay a small square of this material down on a PCB footprint and then with some 
creative alignment holes or fixtureing I can gently press the part down into 
place.  The material is somewhat see through for the smaller pitches so there 
is some visibility for alignment to PCB features.  The biggest issue is that 
everything must be kept planar and clean... Which may mean removing soldermask 
from the PCB footprint and getting out the fine emery paper to "planarize" the 
BGA balls. Each little column of silver plated balls can handle 1 amp of 
current so I have never run into the problem of melting the interconnects.  If 
you are below 1GHz or ~2Gbps in performance then you ca  n probably find a 
lower cost pogo pin socket solution, but if high speed performance is important 
for showing off your application the PariPoser material is great for bench top 
testing and R&D work. 

Regards,
Heidi Barnes



-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of David Greig
Sent: Monday, February 16, 2009 12:32 PM
To: SI-LIST
Subject: [SI-LIST] BGA sockets or a source of compression type material

Dear List
 
I am intending to make physical timing/SI measurements for some DDR3 FPGA 
memory controller IP that I have been developing.
This will involve testing with memory devices from several vendors, and 
differing speed grades.
I do not have regular low cost access to BGA rework kit and was wanting to keep 
the costs down (it's off my own back and funded out of my pocket). 
 
Are there any low cost sockets specifically for DDR bga's, or for that matter 
sources of 0.8mm pitch compressible matrix material? Ideally thru catalogue or 
online distribution. fclk <= 533MHz.
 
Best Regards
 
David Greig
 

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