MiniBoardPro 4 Layer

Our MiniBoard Service is our least expensive PCB option. These are the same high quality PCBs as our other manufacturing services, but with a fixed size and quantity. By standardizing the size and number, we can offer these boards at a very low price.

Cutoff Time for all services is 2 PM Eastern Time. We only manufacture orders placed via our ExpressPCB Software.


PhotoMiniBoardPro4LayerPCB_8004 Layer – MiniBoardPro boards have top and bottom copper layers. Two more layers are sandwiched inside forming Ground and Power planes. Through-hole pads can be connected to, or isolated from, the inner planes. These boards include the green solder mask and white silkscreen layers for a very professional appearance.

  • 4 Layer – MiniBoardPro boards are multi-layer PCBs that include the solder mask and silkscreen layers.
  • For a fixed price of $91, you will receive 3 identical boards.
  • The board’s size must be 3.8 x 2.5 inches.
  • Orders submitted Monday through Friday by 2:00pm ET are shipped in 3 business days.


Manufacturing Specs

ExpressPCB Manufacturing Specs PDF

 MiniboardPro 4 Layer
Layers4 Layer
Lead Time3 Day
Maximum Board SizeBoards are cut in a rectangle 3.8 x 2.5 inches. 
Minimum Board SizeBoards are cut in a rectangle 3.8 x 2.5 inches. 
Panelize Muliple BoardsWe do not recommend that users cut apart 4 layer boards because this can result in shorts between the inner layers.
Minimum Trace and SpaceEtching resolution is: 0.006″ minimum trace width, 0.006″ minimum space width.
Inner LayersThe two inner layers are solid copper planes. Through-hole pads can either be connected to or isolated from these copper planes. The planes are inset 0.025″ from each edge of the board.
Solder MaskTop and Bottom
Silk ScreenTop
Surface FinishTin\Lead
Solder Mask Pad TolerancePads on the solder mask layers are grown by 0.003″ on all sides. As a result, very fine pitch surface mount components may not include any solder mask between the pins.
MaterialOur 4 layer laminate is constructed as a .059" FR-4 package, which includes .0007" starting copper on layers 1 and 4 (industry standard 1/2 ounce copper base). We plate an additional .001" copper on the surface after drilling and imaging, resulting in a copper thickness on the surface of ~0.0017″. The two inner layers are each constructed with .0014" copper (industry standard 1 ounce).
Dielectric ConstantThe dielectric spacing between the top layer and the “Ground” inner layer is 0.012″ with a dielectric constant of 4.6 +/-0.2. The dielectric spacing between the bottom layer and the “Power” inner layer is 0.012″ with a dielectric constant of 4.6 +/-0.2. The dielectric spacing between the “Power” and “Ground” inner layers is 0.028″ with a dielectric constant of 4.6 +/-0.2.
Plated HolesBoards are manufactured with 4 copper layers and all holes plated-through.
Maximum Hole CountThe maximum number of holes allowed in a MiniBoard is 350.
HolesTwenty-four hole sizes are available: 0.008″, 0.014″, 0.020″, 0.025″, 0.029″, 0.033″, 0.035″, 0.040″, 0.043″, 0.046″, 0.052″, 0.061″, 0.067″, 0.079″, 0.088″, 0.093″, 0.100″, 0.110″, 0.125″, 0.141″, 0.150″, 0.167″, 0.192″, 0.251″. Hole sizes other than those listed are not offered.
Hole ToleranceThese sizes are the finished hole diameters after plating. The 0.008″ and 0.014″ holes may be filled with solder and can only be used as via. The tolerance for the 0.020″ hole is +0.003 / -0.005. The tolerance for the other hole sizes are +/- 0.004″.
Hole Location ToleranceOur hole location tolerance is +/- 0.005”. As such, the tolerance between two holes would be +/- 0.010”.
Minimum Hole DistanceA minimum of 0.021″ space must remain between adjacent holes. For example, the center-to-center distance between two pads with 0.020″ holes must be 0.041″ or greater.
Internal Slots and CutoutsNone
Perimeter SlotsNo Perimeter Slots
Perimeter RoutingThe edges of the board are cut with an accuracy of +/- 0.015″. A minimum of 0.020″ blank space is recommended between the perimeter and all features on the board. Traces placed closer than 0.015″ to the board’s edge may be routed off.
TemperatureThe maximum operating temperature is 125 degrees C.