4. Materials and manufacturing processes. Associated controls
The intended application brings with it constraints that need to be taken into account when choosing materials right from the design phase. The following examples of basic material properties illustrate the importance of choosing the right materials.
Coefficient of thermal expansion (CTE) of the printed circuit board: choosing this parameter helps avoid thermal stresses due to the difference in CTE between the printed circuit board and surface-mounted assemblies, given that among base materials, the CTE value in the plane of the material (x and y axes) can vary by a factor of 10.
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PCB Maximum Operating Temperature (MOT): this is the temperature at which a laminate can be operated continuously over a long period without significant deterioration. This MOT is used to define the range of applications (under-hood...
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Materials and manufacturing processes. Associated controls
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Bibliography
Software tools and websites
http://electronique-mag. com piste et pastilles magazine website dedicated to printed circuit boards.
http://ipc-2581.com/ PCB data exchange file description site
Regulations
RoHS Directive: Directive 2011/65/EU of the European Parliament and of the Council of June 08, 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment (RoHS: Restriction of Hazardous Substances).
WEEE Directive 2012/19/EU of the European Parliament and Council of July 04, 2012 on waste electrical and electronic equipment (WEEE: Waste Electrical and...
Events
IFTEC training courses in printed circuit board technology : http://www.iftec.fr.
Standards and norms
The French NF 93713 and European UTE 93703 standards, although still in use and valid for standard printed circuit boards, are no longer updated for advanced processes, and have been superseded by the American IPC standards ( http://www.ipc.org ): The institute for interconnecting and packaging Electronic circuits.
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