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MiniBoard Service

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.

 

 

Description

MiniBoards are available with 2 or 4 copper layers. The size of these boards must be exactly 3.8 x 2.5 inches and each order include 3 identical PCBs. We offer three choices: Our Standard Miniboard, the MiniBoardPro, and the 4 Layer - MiniBoardPro.

 

 

Manufacturing Specs: Common to all MiniBoards

  • Boards are cut in a rectangle 3.8 x 2.5 inches. The quantity of boards made is 3. Other sizes or quantities are not available.
  • Etching resolution is: 0.006" minimum trace width, 0.006" minimum space width.
  • The maximum number of holes per board is 350.
  • A 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.
  • No copper (pads or traces) can be placed closer than 0.025" to the perimeter of the board.
  • The maximum operating temperature is 125 degrees C.

photo miniboard propcb

 

The MiniBoardPro

MiniBoardPro boards are two layer boards with all holes plated through. They include the solder mask layers giving the boards a green color and a very professional look. Printed on the top surface is a white silkscreen layer showing the component outlines and text.

 

 

 

 

 

Manufacturing Specs: MiniBoardPro

  • Boards are manufactured double-sided with all holes plated-through.
  • Single-sided boards are manufactured with plated-through holes.
  • The laminate is 0.062" FR-4 epoxy glass with 1/2 ounce copper. We plate an additional 3/4 ounce of copper (totaling 1 1/4 ounce), resulting in a copper thickness of ~0.0017".
  • The top and bottom solder mask layers are green LPI.
  • Pads on the solder mask layers are grown by a minimum of 0.003" on all sides. As a result, very fine pitch surface mount components may not include any solder mask between the pins.
  • A white silkscreen is printed on the top side of the board showing component outlines and text. These features are automatically masked to prevent the white printing from overlapping on top of pads (or anywhere there is no solder mask).
  • The board finish is the industry standard SMOBC with pads having a tin/lead solder plating.
  • Twenty-three hole sizes are available: 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". These sizes are the finished hole diameters after plating. The 0.014" hole 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 sizes other than those list are not offered.
  • The dielectric constant of our FR-4 laminate ranges from 4.2 to 5.0.

The Standard MiniBoard

Standard MiniBoards are two layer boards with plated through holes. They do not include the solder mask or silkscreen layers which are primarily cosmetic. Electrically, these boards are first rate with bright shiny traces and pads. Because they do not have green solder masks, they are the yellowish color of the industry standard FR-4 laminate.

 

 

photo miniboard standard pcb

 

 

Manufacturing Specs: Standard MiniBoard

  • Boards are manufactured double-sided with all holes plated-through.
  • Single-sided boards are manufactured with plated-through holes.
  • The laminate is 0.062" FR-4 epoxy glass with 1/2 ounce copper. We plate an additional 3/4 ounce of copper (totaling 1 1/4 ounce), resulting in a copper thickness of ~0.0017".
  • The final finish is tin-lead reflow.
  • Twenty-three hole sizes are available: 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". These sizes are the finished hole diameters after plating. The 0.014" hole 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 sizes other than those list are not offered.
  • The dielectric constant of our FR-4 laminate ranges from 4.2 to 5.0.

 

photo mini board pro4 layer pcb

 

The 4 Layer - MiniBoardPro

4 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.

 

 

 

Manufacturing Specs: 4 Layer - MiniBoardPro

  • Boards are manufactured with 4 copper layers and plated-through holes.
  • The laminate is FR-4 with an overall thickness of 0.058". The two inner layers have a copper weight of 1 ounce. The outer copper layers have a finished copper weight of ~1.25 ounce.
  • The top and bottom solder mask layers are green LPI.
  • Pads 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.
  • A white silkscreen is printed on the top side of the board showing component outlines and text. These features are automatically masked to prevent the white printing from overlapping on top of pads (or anywhere there is no solder mask).
  • The board finish is the industry standard SMOBC with pads having a tin/lead solder plating.
  • Twenty-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". These 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 sizes other than those list are not offered.
  • The 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.
  • The 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.
  • We do not recommend that users cut apart 4 layer boards because this can result in shorts between the inner layers.

 

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