Laser Drilling Microvias

Microvias are becoming more and more common in the board designs of today. There are many benefits to laser drilling microvias, including real estate savings, impedance control, circuit reliability, and RF line termination. For this reason, MLT has developed laser microvia processes to work with a very wide range of materials and via profiles to fit your designs that meet IPC standards.

MLT offers laser drilling microvias in both copper clad and unclad laminates. While we do recommend that outer layer foils be kept to half ounce or thinner for process efficiency, we are capable of handling much thicker copper cladding if your design calls for them.

Please see our PCB Materials section for more information on the range of materials that MLT is capable of processing or give us a call if you want to discuss a particular application.

Laminate Ipc

Microvia hole diameters are limited by aspect ratio (hole depth to hole diameter). As the hole depth exceeds the hole diameter, laser drilling quality can be affected. Please contact MLT for microvia size requirements that exceed a 1:1 aspect ratio.

CAD or Data Requirements

CAD system integration and custom file converters enable flexible, laser manufacturing from customer-provided data. Although most file types are accepted, the preferred file types are Gerber, Excellon, DXF, or other 2D formats. In most cases, non-scaled data is required as MLT will make the appropriate scaling or offsets to meet part dimensions.

If concerned about compatibility of your data format or CAD/CAM tool, please contact MLT Sales for more information. For more CAM/CAD guidelines and detailed requirements, click CAD Requirements.

Drilling and Machining Tolerances

Positional:+/- .001” over 12 inches
Dimensional:+/- .0005”
Hole Sizes:.001” and up in diameter
Panel Sizes:24” x 30” without custom fixturing


  • FR4 all types
  • Hitachi
  • Soldermask
  • Isola
  • Gore
  • Rogers (Duroid & Teflon)
  • Getek
  • Taconic
  • Mitsubishi BT's
  • Nelco
  • Ceramics
  • Reinforcements

    Woven Glass (106,1080,2216,2213,2313)

    Aramid (Thermount)


    Non-woven glass



    BCB (benzocyclobutene)


    Cyanate ester

    PEEK (polyetheretherketone)

    Epoxy blends


    FEP (fluorinated ethylene propylene)



    LCP (Liquid Crystal Polymer)

    PPE (polyphenylene ether)

    BT resins

    Via Construction

    Blind – single and double deep






    Microvia Drilling Informative Article Series

    Microvia Drilling: Accuracy

    Coming Soon

    Microvia Drilling: Reliability

    Coming Soon

    Microvia Drilling: Efficiency

    Coming Soon