Although the potential for low temperature enhancement of CMOS circuit performance has been recognized for some time, circuit scaling (proportionally reducing the size of the circuit) has been the preferred method of achieving higher performance. But as minimum feature size passed well into the sub-micron and now into the nanometer region, this route to higher performance has … [Read more...]
The Anisotropic Thermal Conductivity of Plastics
The easiest way to tailor thermal conductivity of plastics is to incorporate some highly thermal conductive filler material into the plastic molding compound. Here the filler particles act as heat carriers in the thermally isolating media. Roughly, if more filler is used, then higher thermal conductivity is achieved. Phenomena related to manufacturability and strength often … [Read more...]
Simplified Formula for Estimating Natural Convection Heat Transfer Coefficient on a Flat Plate
Although most of the emphasis today in the electronics cooling community is devoted to extending forced convection cooling capability, many applications still depend upon natural convection cooling. Basically, natural convection cooling combined with radiation is what results when a fan is not used in the cooling design to move air. Instead, movement of the air is induced by … [Read more...]
Dimensional Analysis for Package Designers
The care with which we express the dimensions of important parameters makes the difference between conveying useful information or conveying useless or misleading data. Taking the issue of units one more step, the purpose of this article is to suggest that we occasionally organize our work to get rid of dimensions altogether. We must live in a dimensional world. A critical … [Read more...]
Visualization of air flows in electronics systems
The three-dimensional shape and irregular nature of electronic component topologies on air-cooled Printed Circuit Boards (PCBs) give rise to complex air flow patterns that have been well documented [1]. Even laminar flows over relatively simple shapes, such as cubical metal blocks simulating electronic components, often exhibit multi-dimensional flow phenomena that include … [Read more...]
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