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Via drill tolerance for Embedded and HDI boards

C Shiva

 Hi all,

   What's the via drill tolerance? I heard that it is 3mils. But i think for embedded and HDI PCB's, 3mils becomes high since tight space constraint in that boards. Any suggestions will be appreciated.

Thanks,

Shiva.

  • redwire

     Best to ask your fabricator but I bet it's something like +0/-X where X=drill size :)

  • C Shiva

    Thanks Redwire. I think in laser drilling tolerance will be less and in mechanical it will be more.

  • redwire

     Nope.  It's really +0/-X for laser formed holes and drills <=10 mils.

    For mechanical mounting holes a standard tolerance is applied but these holes are huge compared to vias.

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