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HDI PCB
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Layer count 4 - 40+ layers, with various HDI structures such as 1+N+1, 2+N+2, 3+N+3, and ELIC (Every Layer Interconnect)
Base Material FR-4, High Tg FR-4, Halogen-free, Rogers, or other high-performance materials
Board Thickness 0.2mm - 6.0mm
Copper Thickness 0.5 oz - 6 oz (17.5μm - 210μm)
Minimum Hole Size 0.1mm for mechanically drilled microvias, 0.075mm for laser-drilled microvias 
Minimum Trace/Space Width 2 mils (50μm) for standard HDI, down to 1 mil (25μm) for advanced designs
Solder Mask LPI (Liquid Photo-Imageable) in Green, Yellow, White, Black, Blue, Red, and other custom colors
Silkscreen White, Black, Yellow, and other custom colors
Surface Finishes ENIG, OSP, Immersion Silver, Immersion Tin, HASL
Blind/Buried Vias Yes, to enable routing between adjacent or non-adjacent layers
Minimum Annular Ring 2 mils (50μm) for outer layers, 1 mil (25μm) for inner layers
Controlled Impedance Tolerance of ±10% or better
Special Features mbedded or integrated passive components (resistors, capacitors, etc.), rigid-flex designs, back drilling, etc.