Provide a complete, clearly labeled Gerber package. Misnamed or incomplete files are a primary cause of fabrication errors and delays.
| Layer / File | Standard Naming Convention |
|---|---|
| Top Copper | *.GTL or *_Top_Copper.gbr |
| Bottom Copper | *.GBL or *_Bot_Copper.gbr |
| Inner Layers (L2, L3…) | *_L2.gbr, *_L3.gbr (etc.) |
| Top Solder Mask | *.GTS or *_Top_Mask.gbr |
| Bottom Solder Mask | *.GBS or *_Bot_Mask.gbr |
| Top Silkscreen | *.GTO or *_Top_Silk.gbr |
| Bottom Silkscreen | *.GBO or *_Bot_Silk.gbr |
| Board Outline | *.GKO or *_Outline.gbr |
| Drill File (PTH) | *.DRL or *_Drill_PTH.xln |
| Drill File (NPTH) | *_Drill_NPTH.xln (if applicable) |
| NC Drill / Excellon | Include tool size table in header |
| IPC-2581 or ODB++ | Acceptable as comprehensive single-file alternative |
BEST PRACTICE: Always include a README.txt or layer mapping document in the Gerber ZIP that identifies each file and its purpose. This eliminates ambiguity with fab partners.