High Density Interconnect

Isola HDI Designs

High Density Interconnect (HDI) attributes are printed circuit board designs that employ increased feature density to achieve lighter weight, reduced layer count, and thinner stack ups.

HDI design configurations allow multi-track routing of high I/O, fine pitch devices 0.5 mm and below. Isola is an industry leader in resin system development and has designed several resin systems and construction sets that enable consistent, reliable production of HDI printed circuit board products.  Our high performance products, such as 370HR, provide the thermally robust performance required for sequential lamination cycles of these complex structures. In addition, we incorporate square weaves, spread glass technology that improves laser ablation consistency, critical feature registration, and dielectric thickness control.  We offer our ultrathin glass fabrics down to 1/2 mil (0.02 mm) for many of our high performance products. With these glass styles, Isola provides a glass reinforced 1.0 mil (0.04 mm) laminate that improves composite structure rigidity and array registration when compared to unreinforced solutions.


  • Multiple resin systems – High Tg, lead-free, high speed digital, RF, halogen-free
  • Hybrid capability
  • Wide range of RC% prepregs
  • Ultrathin glass styles  – 1027, 1035, 1078, 1067, 1086
  • Square weave and spread glass
  • Ultrathin glass reinforced laminate down to 0.04 mm or 1 mil
Typical Applications

  • Servers
  • Personal Electronics
  • Military and Aerospace
  • Layer Count Reduction
  • Sequential Lamination
ProductCTE Z-axisTg
by TMA
Tachyon® 100G2.52003603.020.0021
I-Tera® MT402.82003603.450.0031

Webinars, Videos & Articles

Control of Key Registration Variables for Improved Process Yields on Dense MLBs (Technical Paper)

This paper explains the sources of registration error and outlines a path for improving process yield.


This paper discusses laser and plasma ablatable dielectric materials, available as coatings on copper.

ICDs (InterConnect Defects) What are they? Where do they come from? How can we make them go away? (Presentation)

This presentation describes smeared resin, hole debris and post separation ICDs.