Flex / Rigid-Flex PCB DFM Requirements


 
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         Saturn Flex DFM

 Arrow Copper Layers - Outer
 Arrow Copper Layers - Inner
 Arrow Fabrication Features
 Arrow Soldermask
 Arrow Silkscreen
 Arrow Standard DFM Modifications
 Arrow Minimum Bend Radius


Copper Layers - Outer

 
1.5 Ounce Finished Copper
DFM  Minumum (in Mils) Preffered (in Mils)
Pad to Pad 5 6
Pad to Circuit 5 6
Circuit to Circuit 5 6
Line Width 4 5
Thermal Spoke Width        7 10
Thermal Moat Width 10 12




 

 

 

 

 

 
2 Ounce Finished Copper
DFM  Minumum (in Mils) Preffered (in Mils)
Pad to Pad 6 7
Pad to Circuit 6 7
Circuit to Circuit 6 7
Line Width 5 6
Thermal Spoke Width        8 10
Thermal Moat Width 10 12

 

 

 

 

 

 

 
3 Ounce Finished Copper
DFM  Minumum (in Mils) Preffered (in Mils)
Pad to Pad 8 9
Pad to Circuit 8 9
Circuit to Circuit 8 9
Line Width 7 8
Thermal Spoke Width        10 12
Thermal Moat Width 10 12




 

 

 

 

 




Copper Layers - Inners

 
0.5 Ounce Finished Copper
DFM  Minumum (in Mils) Preffered (in Mils)
Pad to Pad 4 5
Pad to Circuit 4 5
Circuit to Circuit 4 5
Line Width 4 5
Thermal Spoke Width        7 10
Thermal Moat Width 10 12

 

 

 

 

 



1 Ounce Finished Copper
DFM  Minumum (in Mils) Preffered (in Mils)
Pad to Pad 6 7
Pad to Circuit 6 7
Circuit to Circuit 6 7
Line Width 5 6
Thermal Spoke Width        8 10
Thermal Moat Width 10 12

 

 

 

 

 


 

 
2 Ounce Finished Copper
DFM  Minumum (in Mils) Preffered (in Mils)
Pad to Pad 8 9
Pad to Circuit 8 9
Circuit to Circuit 8 9
Line Width 7 8
Thermal Spoke Width       
10 12
Thermal Moat Width 10 12

 

 

 

 

 







Fabrication Features

DFM  Minumum (in Mils) Preffered (in Mils)
NPTH to Pad 10 10
NPTH to Circuit 10 10
Rout to Copper 5 7
Scored edge to Copper 15 15
PTH to Rigid Edge
15 20
Trace to Flex Edge (edge insulation) 10 15
Outside Dimensional Tolerance (Rigid) 5 7
Outside Dimensional Tolerance (Flex) 10 15
PTH to Copper (Inner Layers) 10 12
PTH Annular Ring 5 7
PTH Diameter Tolerance - Solder finish 3 3
PTH Diameter Tolerance - Immersion finish 2 3
Via Annular ring 5 7
NPTH larger than 0.250" No No
NPTH Drilled at Secondary Drill No No
Blind Via Aspect Ratio 1:1 0.75:1




 

 

 

 

 

 

 

 

 

 

 

 


Soldermask

DFM  Minumum (in Mils) Preffered (in Mils)
NPTH Annular Ring 10 14
Via Pad Annular Ring
0 0
PTH Pad Annular Ring
2 3
Coverlay to Feature Clearance
10 15
SMD Annular Ring
2 3
Mask Dam                                           
3 3
Coverage
2 3




 

 

 

 

 

 



Silkscreen

DFM  Minumum (in Mils) Preffered (in Mils)
Minimum Line Width                        5
5






Standard DFM Modications (FYI)

 
 Adjusted Value
 Silkscreen to Soldermask Opening
 2
 Soldermask Opening to Copper
 2






Minimum Bend Radius (FYI)

  Min Bend Radius
(multiple of circuit thickness) 
  Min. Max.
 1 Metal Layer 3 6
 2 Metal Layers  6  10
 Multilayers  10  15
 Dynamic Flex (1L Recommended)  20  40