Printed circuit boards (PCB)
Technology
- Linewidths & spaces: ~125µm
- Dielectric layers: 125–250µm thick
- Core: 500–750µm thick
- Solder-ball spacing: 1.27mm
- Will decrease to 0.5mm soon
- ~30 layers
- Buried resistors
- Controlled-impedance traces
High-tech foundries: 2× technology
- Minimum linewidth & spaces: ~50µm
- ~68 layers
- etc.