PCB Specifications and DRC

Last Updated: September 17, 2019
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PCB Specifications offered by MacroFab


These are what MacroFab currently offers for PCB options though the online interface. See this knowledge base article for how to customize your PCB options.

PropertyOptions Offered
Layers2, 4, 6, 8, 10, 12, 14, 16
PCB SubstrateFR4, TG175, Lead Free, RoHS Compliant
Thickness0.062” (1.6mm) standard, 0.008″-0.248″ (0.2mm – 6.3mm) custom
PCB Thickness Increment0.0004″ (0.1016mm)
Max Dimensions14.9” x 14.9” (378.46mm x 378.46mm)
Minimum Billable Area1 square inch (25.4mm²)
FinishENIG Finish
Solder ResistTop and Bottom Standard
SilkscreenTop and Bottom Standard
Copper Weight1 ounce (35μm), 2 ounce (70μm)
Silkscreen ColorRed, green, blue, yellow, black, white
Soldermask ColorRed, green, light green, matte green, blue, yellow, black, matte black, white, dark brown, transparent
Plated SlotsSupported
CastellationsSupported
Impedance ControlSupported
Blind and Buried ViasNot Supported (contact sales)

Design Rules for PCBs


MacroFab has 4 different sets of Design Rule Checks (DRC) for PCBs. Standard, Extended Manufacturing, Extended Drill, and Extended Manufacturing and Drill. Most PCBs fall under our Standard DRC.

DRC for 1oz (35μm) copper PCBs

PropertyStandard ManufacturingExtended ManufacturingExtended DrillExtended MFG & Drill
Minimum trace width5 mil (0.127mm)3 mil (0.0762mm)5 mil (0.127mm)3 mil (0.0762mm)
Minimum spacing5 mil (0.127mm)3 mil (0.0762mm)5 mil (0.127mm)3 mil (0.0762mm)
Minimum annular ring4 mil (0.1016mm)3 mil (0.0762mm)4 mil (0.1016mm)3 mil (0.0762mm)
Clearances from edge of board10 mil (0.254mm)3 mil (0.0762mm)10 mil (0.254mm)3 mil (0.0762mm)
Minimum drill size10 mil (0.254mm)10 mil (0.254mm)4 mil (0.1016mm)4 mil (0.1016mm)
Minimum paste aperture
12 mil (0.3048mm)12 mil (0.3048mm)12 mil (0.3048mm)12 mil (0.3048mm)
Minimum Silkscreen Size
5 mil (0.127mm)5 mil (0.127mm)5 mil (0.127mm)5 mil (0.127mm)
Minimum Route Size
39.37 mil (1.0mm)39.37 mil (1.0mm)39.37 mil (1.0mm)39.37 mil (1.0mm)

DRC for 2oz (70μm) copper PCBs

PropertyStandard ManufacturingExtended ManufacturingExtended DrillExtended MFG & Drill
Minimum trace width6 mil (0.1524mm)N/A6 mil (0.1524mm)N/A
Minimum spacing6 mil (0.1524mm)N/A6 mil (0.1524mm)N/A
Minimum annular ring6 mil (0.1524mm)N/A6 mil (0.1524mm)N/A
Clearances from edge of board10 mil (0.254mm)N/A10 mil (0.254mm)N/A
Minimum drill size10 mil (0.254mm)N/A4 mil (0.1016mm)N/A
Minimum paste aperture
12 mil (0.3048mm)N/A12 mil (0.3048mm)N/A
Minimum Silkscreen Size
5 mil (0.127mm)N/A5 mil (0.127mm)N/A
Minimum Route Size
39.37 mil (1.0mm)39.37 mil (1.0mm)39.37 mil (1.0mm)39.37 mil (1.0mm)

For PCBs with 2oz (35μm) copper the minimal trace width, spacing, and annular ring need to be larger to account for the thicker plating of copper. Because of this, 2oz Copper disables the extended manufacturing option.

Finished Drill Sizing


The MacroFab platform interprets drill hits as the finished size. This is the final diameter after plating and the surface finish applied. No plating tolerance is required in specifying drill sizes.

Drill Ratios and Laser Vias


The drill aspect ratio is the relationship between the depth of the drill hit and the width. For example, if the drill hit goes all the way through a 62 mil (1.6mm) thick PCB (standard PCB thickness) and the drill hit is 4 mil (0.1016mm) in diameter the ratio would be 62 ÷ 4 = 15.5.

Drill OptionMax Drill Ratio
Standard Drills10
Extended Drills16

Standard mechanical drills are used all the way down to 4 mil (0.1016mm) diameter vias. Laser drilling techniques are used for blind and buried vias. If you need blind and/or buried vias please contact sales.

Paste Layer Specifications


Paste layers for PCB designs should be supplied with zero paste mask shrink.

PCB Layer Stack Ups


MacroFab has a standard set of PCB layer stack ups. For more information on PCB layer stack ups check out the knowledge base article PCB Layer Stack Ups. If a custom stack up is required for your project, contact us!

MacroFab PCB stack up datasheet

PCB and Material Datasheets


Below you can find the datasheets for the materials that are used to create your PCB.

PCB Manufacturing Standards
FR4 datasheet
R-500 GHB Soldermask Datasheet

Assembly Capabilities


MacroFab’s assembly capabilities can be found in this knowledge base article.

Additional Questions?


Our support and engineering staff is here to help! If you have any questions about your PCB design and what set of DRC to use, contact our support team! Does your PCB assembly need different specifications, material, or stack up other then the defaults options? Contact our sales team!