After Dark

Clear soldermask on a black substrate for stylish boards with easy debugging.

Pricing

$5 per square inch, which includes three copies of your design. For example, a 2 square inch board would cost $10 and you’d get three copies of your board. You can order as many copies as you want, as long as they’re in multiples of three.

Turn Times

Orders will be sent to fabrication weekly, and ship within 21 calendar days of ordering.

You can get a quote, approve a design, and pay for an order at OSH Park.

Common Specs

These specs apply to all our PCB services.

Spec Value  
Manufactured in the United States Yes  
Lead Free compatible Yes  
RoHS Complaint Yes  
High Temp Yes, 180 Tg (see Material Specs)
(Exception: Afterdark is temporarily using 140tg core due to supply issues)
 
PCB Finish ENIG (Gold), compliant with IPC-4552  
Soldermask Type SMOBC (Soldermask Over Bare Copper), both sides  
Silkscreen Type High Res DLP, both sides  

Stackup

Thickness Layer Tolerance
1mil (0.0254mm) silkscreen +/-0.2mil (0.00508mm)
1mil (0.0254mm) solder resist +/-0.2mil (0.00508mm)
1.4 mil (0.0356mm) 1 oz copper  
60 mil (1.5240mm) core +/-6mil (0.1524mm)
1.4 mil (0.0356mm) 1 oz copper  
1mil (0.0254mm) solder resist +/-0.2mil (0.00508mm)
1mil (0.0254mm) silkscreen +/-0.2mil (0.00508mm)

Material Specs

Spec Value  
Substrate Black 180Tg FR4
Black 140Tg FR4 (temporary core due to 180Tg supply issues)
Updated Sept 16
Ventec VT 447 b Datasheet.pdf
Board Thickness 63mil (1.6mm) nominal  
Dielectric 4.35 at 1GHz  
Soldermask Color Clear  
Minimum soldermask web 4 mil (0.1016mm)  
Maximum soldermask alignment 3mil (0.0762mm) Covers retraction, expansion, and shift
Silkscreen minimum line width 5 mil (0.127mm) (recommended minimum)
3 mil (0.0762mm) (short lines, text, graphics)
 
Maximum board size 16in (406.4mm) by 22in (558.8mm)  
Minimum board size 0.25in (6.35mm) by 0.25in (6.35mm)  

Copper Specifications

Spec Value  
Copper Layers 2  
Copper Weight 1oz  
Trace Spacing 6mil (0.1524mm)
Trace Width 6mil (0.1524mm)
Annular Ring 5mil (0.127mm)
Board Edge Keepout 15mil (0.381)
Via Plating Thickness 1mil (0.0254mm)  

Drill Specifications

Spec Value  
Minimum Annular Ring 5mil (0.127mm)  
Minumum Drill Size 10mil (0.254mm)  
Minimum Slot Size 20mil (0.508mm) (drill slot only) Additional information on slots
Drill Size tolerance Max: +/- 2.5mil (0.0635mm)
Typical: +/- 1.0mil (0.0254)
 
Drill Positional Tolerance Max: 2mil (0.0508mm)
Typical: <1mil (0.0254mm)
 
Via Tenting Yes (filled hole and flat surface not guaranteed)  
Buried Via false  
Blind Via false  
Castellations Allowed, but not guaranteed Details and recommendations
Maximum Drill Size None Drill sizes above 250mil (6.35mm) will be fabbed, but with larger milling tolerances.