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Flex

1. What do I have to consider to achieve the highest ductility possible for flexible printed circuits (FPC)?
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   The flexibility is influenced by the base material thickness and the number of layers. The more layers, the more inelastic the board will become. In the layout of multi-layer flex boards it is recommended to align circuit paths on top and bottom side offset to each other. Furthermore the copper thickness plays a decisive role. Thus etching procedures exist to carry out the copper slightly thinner on certain bending areas to achieve a higher flexibility.

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2. Is it possible to apply plated-through drillings throughout the flexible printed circuits (FPC)?
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3. Is it possible to mount SMDs onto flexible printed circuits (FPC)?
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4. Is it possible to carry out double-sided FPCs with LeitOn Flex?
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5. Is it possible to carry out flexible multi-layer FPC with LeitOn Flex?
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6. May flexible printed circuits (FPC) be buckled?
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7. Is a soldering mask lacquer applied onto flexible printed circuits (FPC)?
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8. Which surface materials can be chosen for flexible printed circuits (FPC)?
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9. What is the Tg of Flex-boards?
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10. Are flexible printed circuit boards UL-compliant?
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11. Are polyimide and Kapton identical?
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12. What is the maximum operating temperature of flexible PCBs with polyimide foil?
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13. What is polyimide?
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14. Can flexible printed circuit boards be used for high-frequency applications?
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15. What is the value for the dielectricity constant of flexible polyimide foils?
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16. What is the value for voltage resistance of polyimide?
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17. What is the value of leakage resistance (CTI) of polyimide?
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18. Is specialised machinery required for the fabrication of flexible PCBs?
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19. Which mechanical procedures can be applied when fabricating flexible PCBs?
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20. Is it possible to order production-run amounts when I am satisfied with the fabricated prototypes?
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21. Does polyimide have any disadvantages?
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22. What are the delivery periods for flexible printed circuit boards?
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23. Where are most of the flexible PCBs applied?
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24. Are flexible PCBs RoHS-compliant?
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25. How thin are flexible printed circuits (FPC)?
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26. How thick is the copper layer on flexible printed circuits (FPC)?
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27. Which base materials are used for Flex-PCBs?
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28. Is it recommendable to apply tear-drops for connecting the pads?
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29. Can circuit paths be placed at will on FPCs?
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30. Do I have to consider certain directions or angles for placing circuit paths on flexible PCBs?
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31. Can I be creative in designing the layout of flexible printed circuit boards?
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32. What are the advantages of flexible printed circuits (FPC)?
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33. What has to be considered in designing the layout of flexible printed circuits?
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Additional information about Printed Circuit Boards (PCBs):

• wikipedia.org
  Online Encyclopedia - Topic PCBs
• www.vde.com
  VDE - Verband Elektrotechnik Elektronik Informationstechnik e.V.
• www.vdi.de
  VDI - Verein deutscher Ingenieure
• www.vdlev.org
  VDL - Verband der Leiterplattenindustrie
• www.zvei.de
  ZVEI - Zentralverband Elektrotechnik- und Elektronikindustrie e.V.
• www.leuze-verlag.de
  Leuze Verlag - Literature about PCBs and PCB production
• www.elektronikpraxis.vogel.de
  Elektronik Praxis - Magazine covering electronics in general and news in the PCB production industry.
• www.elektor.de
  Elektor - Electronics Magazine with manuals and layouts for home made PCBs and PCBAs
• www.ibfriedrich.com (Target 3001)
  The Engineering office Friedrich has been developing layout and CAD software for PCB design and Application Oriented Special Integrated Circuits (ASICs) since 1989.
• www.cadsoft.de
  CadSoft offers user-friendly, powerful, and inexpensive solutions for PCB designs including circuit diagrams, layouts, and autorouting routines.
• http://news.google.de/news
  Worldwide news about Printed Circuit Boards (PCBs)