Brian, I would think that the solder ball must attach to something and that something more than likely has a current carrying capacity. Would it help if you thought of the ball + something as a system and obtained the rating for the said something? Craig -----Original Message----- From: Moses Chan [mailto:mchan@xxxxxxxxxxx] Sent: Wednesday, February 05, 2003 2:33 PM To: BSchieck@xxxxxxxxxx; si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: Current capacity of a Solder Ball Hi Brian, I asked the same question to the list a few months back and got the following answer, below: Solder Ball (63Sn/37Pb) 0.0006 m Ambient Temp. 34 Deg. C Melting Temp. 189 Deg. C Thermal Conductivity 50 W/m-C Electrical Resistivity 0.000000145 ohm-m Thermal Resistance 41026.51161 C/W DC Electrical Resistance 0.297442209 ohm Total Resistance 0.297442209 ohm Power to Melt 0.003778045 W Current to Melt 0.112702164 Amps Moses Chan Vitesse Semiconductor Camarillo, California At 11:13 AM 2/5/03 -0800, Brian Schieck wrote: >Does any one know what the current carrying capacity of a solder ball is? >How is the capacity determined? >Is the capacity derated to account for temperature and voids? > > >for a 60 mil solder ball. > >Brian Schieck >NVidia Corporation >2701 San Tomas Expressway MS B22-221 >Santa Clara, California 95050 >Direct Phone # (408) 486-2697 >Corp Phone # (408) 486-2000 x62697 >Local Fax # (408) 486-8078 >Corp Fax # (408) 486-2200 > >Email bschieck@xxxxxxxxxx >------------------------------------------------------------------ >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 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 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 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