Reading time ( words)
Douglas G. Brooks, PhD and Dr. Johannes Adam, CID have teamed up to write PCB Trace and Via Currents and Temperatures: The Complete Analysis. Brooks has been looking at trace current and temperature relationships since the mid-1990s. Now, he and Adam, of the consulting group Adam Research, have assembled decades of knowledge into these pages.
Starting with a historical background, this book covers: (a) PCB materials (copper and dielectrics) and the role they play in the heating and cooling of traces; (b) The IPC curves found in IPC 2152; (c) Equations that fit those curves; (d) Computer simulations that fit those curves and equations; (e) Sensitivity analyses showing what happens when we vary the environment (adjacent traces and planes, changing trace lengths, thermal gradients, etc.); (f) Via temperatures and what determines them; (g) Via current densities; (h) Fusing issues, what happens when traces are overloaded, and (i) Thermal gradients along traces, even at low temperatures.
Also provided are supplemental chapters or appendices about measuring the thermal conductivity of dielectrics and measuring the resistivity of copper traces (and why many prior attempts to do so have been doomed to failure.) And there is even a chapter on whether industrial CT scanning might replace microsections for measuring trace parameters. Never before has such a thorough compendium been available, especially so conveniently.
This book is available through Amazon.
Dave Lackey and Anaya Vardya, American Standard Circuits
The design process is arguably the most important part of the flex circuit procurement process. The decisions made in the design process will have a lasting impact, for better or worse, throughout the manufacturing cycle. In advance of providing important details about the actual construction of the flex circuit, it is of value to provide some sort of understanding of the expected use environment for the finished product.
Dan Beaulieu, D.B. Management Group
Mark Thompson wants to help PCB designers. He’s seen it all in CAM support at Prototron Circuits: the incomplete or inaccurate data packages, boards that are unnecessarily complex or over-constrained, and so much more. Mark just returned to writing his popular Design007 Magazine column, The Bare (Board) Truth, which addresses questions such as, “What happens to your design at CAM?” I asked Mark to explain why it’s so important for designers to communicate with their fabricators, and why they need to get out of the office and visit a board shop every now and then.
Andy Shaughnessy, Design007 Magazine
Whether we’re ready for it or not, 5G technology is coming. We decided to speak with John Hendricks, market segment manager for wireless infrastructure at Rogers Corporation, and Ben Jordan, director of product and persona marketing for Altium, about the challenges related to 5G and what this means for PCB designers and fabricators.