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. Mechanical Processing
2. Chemical Processing
3. Solder Mask
4. Surface Finish
5. Silk Print
6. Base Materials
7. RoHS/WEEE
8. E-Test
9. Panel Production
10. Tolerances
    1. Why is it necessary to maintain a clearance between copper areas and the routing outline?

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    2. Why is a miminum clearance needed with solder mask bridges?

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    3. Why is the solder mask required to be larger than the appropriate pads?

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    4. How do plot tolerances in films occur?

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    5. Why is the drill pad size in the inner layers required to be larger than in the outer layers?

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    6. Why is the clearance of drillings in the inner layers required to be larger than on the outside?

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       If plated-through drillings are desired which are not supposed to be connected to the respective inner layers, appropriate clearances from surrounding copper have to be applied. Plated-through drillings, which connect to an adjacent copper area due to minor offsets within the inner layers, can cause an electric short if these clearances are insufficient.

       Thus the clearances in the inner layers should be approximately 0.7 mm larger than the final drilling diameter (r = 0.35 mm).

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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)