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Board Thickness The board thickness is a part of defining a baseline for creating a trace-sizing chart and has a direct impact on conductor heating. The thickness of the board affects the heat transfer path, causing energy to flow away from the trace. As the board thickness increases, the heat transfer path away from the trace increases. When the heat transfer path is increased, the thermal resistance is lower and the temperature rise is lower. The dielectric material is the first material that begins to transfer heat from the trace. The board material although poor in terms of thermal conductivity is better than just air itself. Figure 12 illustrates the impact of board thickness on trace temperature rise. Each category represents the same trace and current level.The x-axis represents the board thickness in in. A 9 percent increase is seen in the trace temperature rise, going from a 0.07 in. thick to 0.059 in. thick board. A 43 percent increase is seen in the trace temperature rise, going from 0.07 in. thick to 0.038 in. thick. And a 260 percent increase is seen in the trace temperature rise going from 0.07 in. thick to a trace in free air. The free air case is equivalent to the IPC internal conductor-sizing chart.

Judith Glazer*

This chapter describes the response of functional printed circuit board assemblies (PCAs) to environmental stresses that is, their reliability in service and the influence of design, materials, and manufacturing decisions on this behavior A variety of stresses may be present in the service environment of the assembly Thermal stresses come from fluctuations in the ambient temperature in the service environment of the assembly or from power dissipation of highpower devices mounted on the printed circuit board (PCB) There are also thermal stresses associated with assembly and rework Mechanical stresses may be due to bending and flexing of the assembly during later assembly steps or in service, mechanical shock during transportation or use, or mechanical vibration, for example, from cooling fans Chemical sources of environmental stresses include atmospheric moisture, corrosive gases (for example, smog or industrial process gases), and residual chemically active contaminants from the assembly processes (for example, from flux).

These environmental stresses may act singly or in concert with one another and the electrical potential differences that exist when the assembly is functioning to cause electrical failures in the printed circuit assembly (PCA) This chapter will focus on the reliability of the PCB and the interconnects to it Reliability of the electrical components themselves is beyond the scope of this chapter (see Fig 571) By defining reliability as the response of functioning assemblies to environmental stresses, we have excluded the large class of production defects that are detected in the testing processes immediately after manufacturing or that will cause the assembly to be nonfunctioning from the outset This chapter will focus on the delayed effects of manufacturing defects and the wear-out mechanisms of properly manufactured product The remainder of this chapter is organized into six major sections: 571 572 573 57.

note Many of the units do not support lines 15 and 16, and we will not be using them in any of our experiments either.

4 Fundamentals of Reliability Failure Mechanisms of PCBs and Their Interconnects Influence of Design on Reliability Impact of PCB Fabrication and Assembly on Reliability.

* Significant portions of this chapter are drawn from T. A. Yager, Reliability, chap. 30, Printed Circuits Handbook, 3d ed. (Coombs, ed.), 1988.

FIGURE 57.1 Schematic drawing of a printed circuit board assembly. This chapter focuses on the reliability of the printed circuit board and the interconnect between the printed circuit board and the components (shaded area in the drawing).

You can pretty much drop your buttons and menus wherever you please; however, there are some guidelines on how you can make the most of your application buttons and menus. Some layout components, such as Panel Collection and Panel Box, have facets that are specifically designed for menus and buttons. Where you can, use these facets, given they are designed for that purpose. Furthermore, there are parent container components, such as Toolbar and Toolbox, that are also designed to work with buttons and menu components. For example, a Toolbar Button component would typically appear inside a Toolbar component, and the Toolbar component is responsible for managing the layout and stretching of the components within it. The Toolbar component also shows an overflow icon if the page has been resized and not all components in the toolbar are visible. If you require a stack of multiple menus and toolbars, then you can use a Toolbox component to group the required menu and toolbar components.