PCB Specifications and DRC

Last Updated: March 20, 2020
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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.

Property Options Offered
Layers 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 32
PCB Substrate FR4-TG175, Rogers 4003C, Rogers 4350B, Rogers 4450B
Thickness 0.062” (1.6mm) standard, 0.008″-0.248″ (0.2mm – 6.3mm) custom
PCB Thickness Increment 0.0004″ (0.1016mm)
Max Dimensions 14.9” x 14.9” (378.46mm x 378.46mm)
Minimum Billable Area 1 square inch (25.4mm²)
Finish ENIG, ENIPIG, Lead Free HASL
Solder Resist Top and Bottom Standard
Silkscreen Top and Bottom Standard
Copper Weight 1/2 ounce (18μm), 1 ounce (35μm), 2 ounce (70μm)
Silkscreen Color Red, green, blue, yellow, black, white
Soldermask Color Red, green, light green, matte green, blue, yellow, black, matte black, white, dark brown, transparent
Plated Slots Supported
Hard Gold / Edge Fingers Supported
Castellations Supported
Impedance Control Supported
Blind and Buried Vias Supported
Back Drilled Vias Supported
Micro Drill Vias Supported
Epoxy Filled and Capped Vias Supported

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

Property Standard Manufacturing Extended Manufacturing Extended Drill Extended MFG & Drill
Minimum trace width 5 mil (0.127mm) 3 mil (0.0762mm) 5 mil (0.127mm) 3 mil (0.0762mm)
Minimum spacing 5 mil (0.127mm) 3 mil (0.0762mm) 5 mil (0.127mm) 3 mil (0.0762mm)
Minimum annular ring 4 mil (0.1016mm) 3 mil (0.0762mm) 4 mil (0.1016mm) 3 mil (0.0762mm)
Clearances from edge of board 10 mil (0.254mm) 3 mil (0.0762mm) 10 mil (0.254mm) 3 mil (0.0762mm)
Minimum drill size 10 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

Property Standard Manufacturing Extended Manufacturing Extended Drill Extended MFG & Drill
Minimum trace width 6 mil (0.1524mm) N/A 6 mil (0.1524mm) N/A
Minimum spacing 6 mil (0.1524mm) N/A 6 mil (0.1524mm) N/A
Minimum annular ring 6 mil (0.1524mm) N/A 6 mil (0.1524mm) N/A
Clearances from edge of board 10 mil (0.254mm) N/A 10 mil (0.254mm) N/A
Minimum drill size 10 mil (0.254mm) N/A 4 mil (0.1016mm) N/A
Minimum paste aperture
12 mil (0.3048mm) N/A 12 mil (0.3048mm) N/A
Minimum Silkscreen Size
5 mil (0.127mm) N/A 5 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.

Board Edge Routing


Our PCB Board Edge (Routing) Tolerance is ± 6mil (0.15mm).

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 Option Max Drill Ratio
Standard Drills 10
Extended Drills 16

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.

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 and supports custom stackups and PCB substrate materials for PCB Assemblies. For more information on PCB layer stack ups check out the knowledge base article PCB Layer Stack Ups.

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 what we offer? Contact our sales team today.

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