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

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   2. 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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   3. Why do positioning prints on copper pads have to be avoided?

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   4. Is it possible to apply solder mask in different colours?

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   5. Is it possible to overprint plated-through drillings with solder resist?

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   6. Is the fabrication of grounded areas possible without solder mask lacquer?

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4. Surface Finish
5. Silk Print
6. Base Materials
7. RoHS/WEEE
8. E-Test
9. Panel Production
10. Tolerances

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)