4-layer PCB with gold finger and BGA Min. line width/space : 4mil PTH hole diameter tolerance : 3mil NPTH hole diameter tolerance : 2mil Board thickness : 62mil Hole position deviation : 2mil Outline tolerance : 4mil Minimum S/M pitch : 4mil BGA:0.3mm Impedance: 90&100 ohm for differential Min via:0.1 with laser drill L1-L2, HDI Application: Computer and industry control