Since most fab notes specify a minimum hole wall thickness of 1 mil continuous, calculate the current handling ability of a trace with a width equal to the diameter of the hole and a thickness of 1mil, Then multiply by 3.141592654 A calculator can be found at: http://www.ultracad.com/calc.htm <http://www.ultracad.com/calc.htm> Or online at http://www.geocities.com/CapeCanaveral/Lab/9643/TraceWidth.htm <http://www.geocities.com/CapeCanaveral/Lab/9643/TraceWidth.htm> -----Original Message----- From: Rose, Steve M [mailto:[log in to unmask]] Sent: Tuesday, May 25, 1999 5:40 AM Subject: Through-hole current calculator? How much current can that via safely handle? What are the effects over temperature? Area and plating considerations? A current calculator of sort would help simplify a bit. Thanks, ################################################################ DesignerCouncil 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 DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################