Seems to me Jack that if you can have full contact, go for it. Regards, Bill William Csongradi Senior Electrical Engineer Rockwell Collins Heads Down Display Center 319-295-7884 Mailing Address Rockwell Collins 400 Collins Road NE MS 105-167 Cedar Rapids, Iowa 52498-0001 Jack Olson <pcbjack@xxxxxxxxx> Sent by: si-list-bounce@xxxxxxxxxxxxx 03/19/2010 08:43 AM To SI-LIST <si-list@xxxxxxxxxxxxx> cc Subject [SI-LIST] Flooded Vias vs Thermal Relief Greetings, I am being instructed to flood all vias instead of using thermal relief, to get a "better" connection to planes. I've typically used thermal reliefs simply because they are easier to see in checking or design reviews (but its only one mouse click for me to change them so I'm not really complaining). but it got me thinking..... Have any test results ever showed that spokes have a significant impedance or anything that can change circuit performance? (and I'm referring to 12mil plated through-hole vias on boards 100MHz max) I don't remember anyone ever talking about that. surfin' the learnin' curve, Jack ------------------------------------------------------------------ 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 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 Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu