Does solder mask provide electrical insulation?

Discussion in 'General Electronics Chat' started by tracecom, Jun 14, 2010.

  1. tracecom

    Thread Starter AAC Fanatic!

    Apr 16, 2010
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    I just received some prototype PCB's for a project. These are the first PCB's I have laid out in many years and I made a couple of mistakes.

    One is that I have the heat sink for an IRLZ44N touching a track. The track goes to the MOSFET's source and the heat sink is electrically connected to the drain. However, the track is covered with solder mask. Is that good enough for electrical isolation? I know that I can trim the base of the heat sink slightly, or put a piece of tape between the heat sink and the track, but is it necessary?

    Thanks.
     
    Last edited: Jun 14, 2010
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    I would never rely on soldermask as an insulator.
     
  3. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    A soldermask is only to prevent the solder to jump to other pins.

    Attached the complete PDF.

    Bertus
     
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