HOW HOT IS MY VIA? (COOLER THAN YOU THINK!)

摘要

Most people don't have any idea how hot a via gets. After all, it's hard to get a temperature probe down inside the via to find out, at least not without disrupting a lot of things. As far as we know, there haven't been any studies of via temperature, and even the theoretical approaches that exist are pretty approximate. So we set out to answer that question through simulation. In two previous papers the authors explored the current/temperature relationships of PCB traces under normal current loads and under a significant overload of what would be considered the normal current carrying capacity of the trace ("fusing" current and time.) But through the years there has been very little written about the current carrying capacity of a via.