A thin prepreg layer is the most common HDI substrate. It provides good reliability, process-ability and reasonable cost.
Typical thickness of prepreg HDI layer is 60u +/-20u. Typical laser hole diameter (drilled top) is 100 – 150u.

A thin prepreg layer is the most common HDI substrate. It provides good reliability, process-ability and reasonable cost.
Typical thickness of prepreg HDI layer is 60u +/-20u. Typical laser hole diameter (drilled top) is 100 – 150u.