Dec 4, 2012 #1 M muthu21888 Newbie level 1 Joined May 15, 2011 Messages 1 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,288 Hi all, During EM checks we determine how many vias are required based on average current density divided the current limit per via. Why are we using average current density to find the number if vias to pass EM? Why dont we use RMS current to calculate the number of vias required? Dont we expect joule heating in vias? Please clarify my doubts. If you have any documents to understand please mention that. Thanks in advance. Regards, Esakki
Hi all, During EM checks we determine how many vias are required based on average current density divided the current limit per via. Why are we using average current density to find the number if vias to pass EM? Why dont we use RMS current to calculate the number of vias required? Dont we expect joule heating in vias? Please clarify my doubts. If you have any documents to understand please mention that. Thanks in advance. Regards, Esakki
Aug 8, 2013 #2 W WoAiHua Newbie level 6 Joined May 24, 2013 Messages 14 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,361 May I know the formula for average current density and RMS current density? it is for own use. thanks.
May I know the formula for average current density and RMS current density? it is for own use. thanks.