PCB, Artwork design rules

                            Artwork Design Rules

Design Minimum Preferred
External Layers Feature Size um Feature Size um
(17um copper clad, 1.6mm finished thickness)    
Trace Width 100 127
Trace to Trace Spacing 100 127
Trace to Pad Spacing 100 127
Trace to Plane Spacing 127 200
Trace to Unplated Hole 300 350
Trace to NC Routed Edge 400 500
Trace to Punched Edge 1600 1600
Trace to Scored Edge  (Dependent on the angle of the knife) 500 600
Trace to Misc Metal Features (Logo, UL Marking, etc.) 100 500
     
Pad to Pad Spacing 75 127
Pad Size = FHS + (x.xxx) 250 380
     
Via Pad Size = FHS +(x.xxx) 250 380
Via Pad to Via Pad Spacing. Pad is SM Covered 75 127
Via Pad to Via Pad Spacing. No SM cover. With SM Web. 250 300
     
Pad to Plane Spacing 127 200
Pad to NC Routed Edge 400 500
Pad to Punched Edge 1600 1600
Pad to Scored Edge  (Dependent on the angle of the knife) 500 600
     
Unplated Hole Edge to Board Edge 500 1270
Unplated Hole Edge to Unplated Hole Edge. </= 1800 FHS 250 400
Unplated Hole Edge to Unplated Hole Edge. >/= 1800 FHS 250 400
     
Internal Layers (Signals)    
(35um copper clad, 1.6mm finished thickness)
Trace Width 75 127
Trace to Trace Spacing 75 127
Trace to Pad Spacing 75 127
Trace to Plane Spacing 127 150
Trace to Unplated Hole 250 300
Trace to Routed Edge 400 500
Trace to Punched Edge 1600 1600
Trace to Scored Edge (Dependent on the angle of the knife) 500 600
Trace to Misc Metal Features (Scales, Fiducials, etc.) 100 500
     
Pad to Pad Spacing 100 150
Pad Size = FHS + (x.xxx) 250 380
     
Via Pad Size = FHS +(x.xxx) 250 380
Via Pad to Via Pad Spacing 75 127
     
Pad to Plane Spacing 127 200
Pad to Routed Edge 500 600
Pad to Punched Edge 1600 1600
Pad to Scored Edge (Dependent on the angle of the knife) 500 600
     
Internal Layers (Planes)    
(17 oz. copper clad, 1.6mm finished thickness)
Plane Clearance = FHS + (x.xxx) 500 635
Pad Size = FHS + (x.xxx) 250 380
Plane to NC Routed Board Edge 500 750
Plane to Scored Edge  (Dependent on the angle of the knife) 500 750
Connection Annular Ring = Drill + (x.xxx) 127 150
Solder Mask Clearance    
Liquid Photo Imagable    
Pad Size = External Pad + (x.xxx) 75 127
Pad Size = Unplated Hole + (x.xxx) 127 500
Min. Width (Webbing) 100 (Few can do 75) 127
Legend    
Minimum Height 1000 1500
Minimum Stroke Width 127 150
Legend to Solder Mask Clearance Edge 127 250
Legend to Board Edge 250 500
Preferred Practices    
Via Pad Tear Dropping on all Signal Connections yes yes
Breakaway Slot Width   ( See also IPC-7361-3-21 ) 800 1600
Breakaway Slot Web Width 500 1000
Smallest Internal Radius 400 800
     
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