Hi, What I do is: 1. calculate the equivalent conductor width; This is the circumference of the via hole (Pi times Dia). 2. use Fig 3-4, Conductor thickness and width, etc, of IPC-D-275 (or the newer equivalent) on the calculated width. Problem: The conductor thickness (plating) in the via hole may vary; I think. Hope it helps... Joe H. > -----Original Message----- > From: Robert T. Moncada [SMTP:[log in to unmask]] > Sent: Friday, May 01, 1998 11:32 AM > To: [log in to unmask] > Subject: [TN] current carrying capacity of vias > > > > > Technetters- > > Is there a formula for figuring current carrying capacity of > vias? > > ################################################################ > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV > 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC web site (http://jefry.ipc.org/forum.htm) for > additional information. > For the technical support contact Dmitriy Sklyar at [log in to unmask] or > 847-509-9700 ext.311 > ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################