ATE board◆Layer Count:32L◆Material:TU-768◆Board Thickness:4.75±0.25mm◆Min.Trace/Space:3.9/3.9mil◆Min Pitch Size:0.4mm◆Micro vias:L1-L2,L31-L32◆Surface Finish:Flash gold+Hard gold(50u")◆Via-in-Pad:VIPPO◆Aspect Ratio:24:1◆Flatness:≤0.25%