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. 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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      If the solder mask is applied in identical size to the copper pads, its clearances will not accurately fit due to manufacturing tolerances and may partially cover the pads. This prevents a flawless soldering of the printed circuit board (PCB).

      The solder mask pads should therefore be 0.1 mm to 0.2 mm larger (surrounding the structure by 0.05 mm to 0.1 mm) than the copper pads. This applies to pads, fiducial marks, text or logos. In general, it is recommended to enlarge the entire mask by a constant factor appropriate to these structures. This simplifies later manufacturing adjustments of the boards’ layout significantly.


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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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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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LeitOn Leiterplattenproduktion Berlin

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LeitOn GmbH, Wolframstraße 96, 12105 Berlin - Deutschland
Phone:
+49 (0)30 701 73 49 0
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HRB 94175 B, Amtsgericht Charlottenburg
VAT ID:
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