DFM Requirements
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| Download SFS DFM |
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Copper Layers-Outer |
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Copper Layers-Inner |
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Fabrication Features |
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Soldermask |
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Coverlay |
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Silkscreen |
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Standard DFM Modifications |
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Minimum Bend Radius |
| 1.5 oz Finished Copper | ||
| DFM Rule | Min (Mils) | Pref (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 oz Finished Copper | ||
| DFM Rule | Min (Mils) | Pref (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 oz Finished Copper | ||
| DFM Rule | Min (Mils) | Pref (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 oz Finished Copper | ||
| DFM Rule | Min (Mils) | Pref (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 oz Finished Copper | ||
| DFM Rule | Min (Mils) | Pref (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 oz Finished Copper | ||
| DFM Rule | Min (Mils) | Pref (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 |
| DFM Rule | Min (Mils) | Pref (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 |
| DFM Rule | Min (Mils) | Pref (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 |
| DFM Rule | Min (Mils) | Pref (Mils) |
| NPTH Annular Ring | 15 | 20 |
| Via Pad Annular Ring |
0 | 0 |
| PTH Pad Annular Ring |
5 | 10 |
| Coverlay to Feature Clearance |
15 | 20 |
| SMD Annular Ring |
n/a - gang opening | n/a - gang opening |
| Mask Dam |
n/a - gang opening | n/a - gang opening |
| DFM Rule | Min (Mils) | Pref (Mils) |
| Minimum Line Width | 5 |
5 |
Standard DFM Modications (FYI)
| DFM Rule |
Adjusted Value
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| Silkscreen to Soldermask Opening |
2
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| Soldermask Opening to Copper |
2
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Minimum Bend Radius (FYI)
| DFM Rule | Min. | Max. |
| 1 Metal Layer | 3 | 6 |
| 2 Metal Layers | 6 | 10 |
| Multilayers | 10 | 15 |
| Dynamic Flex (1L Recommended) | 20 | 40 |