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 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu