PCB - FAQ & Co.

PCB - FAQ & Co.

Here you can find several frequently asked questions and answers about our printed circuit boards. You may browse through the categories or use the search. If your question remains unanswered, please contact us by email, phone or contact form. We will reply you as soon as possible.

FAQ:

  1. Is it possible to order printed circuit boards (PCB) mit UL-certification?

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  2. When is the UL-certification required?

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  3. What is checked during the E-Test?

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  4. What does the abbrevation FR mean concerning base material for PCBs?

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  5. What different types of FR materials exist?

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    FR1 = Phenolic resin + hard paper
    This is an obsolete and very cheap material. It is higly hygroscopic, it absorbs humidity that is.
    FR2 = Phenolic resin + hard paper
    An old and cheap material formerly used in mass production and separated by blanking. It had to be warmed up for this process otherwise it would splinter. Like FR1 it is hygroscopic and is not used anymore due to its qualitative deficiencies. Furthermore, phenolic resins emit small amounts of phenol and formaldehyde and represent a health risk. Nowadays epoxy resin is commonly used as a substitue for Pertinax (paper containing phenol and formaldehyde).
    FR3 = Epoxy resin + hard paper
    This is a budgt-priced material for consumer electronics.
    FR4 = Epoxy resin + glass fibre fabric
    The most utilised material in the fabrication of printed circuit boards (PCB) is RoHS/WEEE compliant and does not contain any harmful bromine compounds. FR4 has a Tg of 130° C (266° F) and a maximum operating temperature of 110° C (230° F). Thin inner laminates for multi-layer boards are also made of this material.
    FR5 = Epoxy resin + thermostable glass fibre fabric
    Like FR4, but thermally more consistent. FR5 has a Tg of 160° C (320° F) and a maximum operating temperature of 140° C (284° F).


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  6. What does the abbrevation „Tg“ stand for concerning base materials?

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  7. What is Via-filling?

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  8. What is masking lacquer or peelable mask?

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  9. Are chemical nickel-gold and hard gold the same?

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  10. What is the difference between Basic Gerber and Extended Gerber?

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  11. What are aperture lists?

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  12. From where does the term „aperture list“ derive?

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  13. Are hard gold, connector strip gold and galvanic gold the same?

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  14. Are legend print, silk print, mounting print and position print the same?

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  15. What is packaging?

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  16. What is nibbling?

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  17. What does HAL stand for?

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  18. What is a cauterisation allowance?

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  19. What are unrouted traces or air wires?

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  20. What signifies the CTI-value?

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  21. What are the CTI-values of different base materials?

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  22. What is the Epsilon (ɛ) value?

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  23. How does sea-air-freight work?

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  24. What do the international abbrevations FOB, CIF, DDU etc. stand for?

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  25. What is the customs number (TARIC-code) for unassembled PCBs?

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  26. What are buried vias?

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  27. What are blind vias?

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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)

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