4 Layer Medium Run Service

service Moving to a small production run? Our medium run service will help bridge the gap between prototypes and a full panel.

Pricing

$2 per square inch, 100 square inch minimum. You can have as many different designs as you want, as long as each design is ordered in a multiple of 3 boards.

For example, if you have two 25 square inch designs, you could order 3 of each for a total cost of $300.

100 inches is just the minimum order. You can order as much as you’d like beyond that.

Turn Times

Fabrication time can vary for medium run orders. Boards typically ship within 14 calendar days but may take up 4 weeks.

To make an order, please contact [email protected]

We do not offer Super Swift Service for 4 layer boards.

For faster options, you may be interested in our Standard 4 Layer Service.

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)  
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)
1 mil (0.0254mm) solder resist +/-0.2mil (0.0051mm)
1.4 mil (0.0356mm) 1 oz copper  
6.7 mil (0.1702mm) FR408 prepreg +/-.67mil (0.017mm)
0.7 mil (0.0178mm) 0.5 oz copper  
47 mil (1.1938mm) FR408 core +/-4.7mil (0.1194mm)
0.7 mil (0.0178mm) 0.5 oz copper  
6.7 mil (0.1702mm) FR408 prepreg +/-.67mil (0.017mm)
1.4 mil (0.0356mm) 1 oz copper  
1 mil (0.0254mm) solder resist +/-0.2mil (0.0051mm)
1mil (0.0254mm) silkscreen +/-0.2mil (0.00508mm)

Material Specs

Spec Value  
Substrate 180Tg FR408 ISOLA FR408 Datasheet PDF
Board Thickness 63mil (1.6mm) nominal  
Dielectric 3.66 at 1GHz.  
Soldermask Color Purple  
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 4  
Copper Weight 1oz outer
1/2oz inner
 
Trace Spacing 5mil (0.127mm)
Trace Width 5mil (0.127mm)
Annular Ring 4mil (0.1016mm)
Board Edge Keepout 15mil (0.381)
Via Plating Thickness 1mil (0.0254mm)  

Drill Specifications

Spec Value  
Minimum Annular Ring 4mil (0.1016mm)  
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.

Layer Naming

Most default layer file names are automatically detected and fabricated in the order intended by the design tool.

If your tool requires configuration or manual renaming of layers, we suggest this pattern to ensure your layer order is interpreted correctly.

Layer Suggested File Extension  
Layer 1 .GTL Top or Front layer
Layer 2 .G2L Internal layer
Layer 3 .G3L Internal layer
Layer 4 .GBL Bottom or Back layer

For additional info or other layers, see our Suggested Naming Pattern

Internal Plane Polarity

When submitting gerbers, we need the “positive” internal planes, meaning that lines represent copper, not the absence of copper.

Some CAD tools will generate the internal planes as power planes with “negative” polarity so the lines indicate where copper should be removed. To work around this, declare the internal planes as signal layers and use a copper pour to define the power plane.

Take a look at our [Positive and Negative Gerbers][invertedgerbers] page for more information.