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Manufacturing Specs |
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> ExpressPCB offers a choice of several manufacturing options, including two-layer and four-layer circuit boards. The specifications for each of these choices are listed below. |
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| MiniBoard Service |
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| > Our MiniBoard Service is our least expensive PCB option. These are the same high quality double-sided boards as our Standard Service. The board size must be exactly 3.8 x 2.5 inches and the quantity ordered is always three. By standardizing on this size and quantity, we can offer these boards at a very low price. |
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| Description |
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> MiniBoard Service boards have top and bottom copper layers with all holes plated through. They do not include soldermasks or silkscreen layers which are primarily cosmetic. Electrically, these boards are first rate with bright shiny tin/lead solder plated traces and pads. Because they do not have a green soldermask coating, the boards are the yellowish color of the industry standard FR-4 laminate.
MiniBoards must be 3.8" x 2.5" in size. With each order, we send you 3 identical boards. |
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| Pricing |
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MiniBoard orders have a fixed price of $51 (plus $8.90 shipping to the continental US). |
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With each order we will send you three identical boards. |
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Orders submitted Monday through Friday by 2:00pm ET are shipped the next business day. |
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7.75% state sales tax is added to orders shipped to California. |
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Paying for your boards is easy by Mastercard, Visa or American Express. |
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We ship MiniBoards by Second Day Air within the US. |
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For this service, the board size, quantity and shipping method can not be changed. |
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| Manufacturing Specs |
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Boards are manufactured double-sided with all holes plated-through. |
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Single-sided boards are manufactured with plated-through holes. |
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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. |
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Our laminate is 0.062" FR-4 epoxy glass with 1/2 ounce copper.
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We plate an additional 3/4 ounce of copper (totaling 1 1/4 ounce), resulting in a copper thickness of ~0.0017". |
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The final finish is tin-lead reflow. Lead-free is not available with our MiniBoard service. |
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No copper (pads or traces) can be placed closer than 0.025" to the perimeter of the board.
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Etching resolution is: 0.006" minimum trace width, 0.006" minimum space width. |
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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. |
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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. |
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The maximum number of holes per board is 350.
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The dielectric constant of our FR-4 laminate ranges from 4.2 to 5.0. |
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The maximum operating temperature is 125 degrees C. |
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Silk screening, solder masks and multi-layer boards are not available with this service. |
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Pricing and manufacturing specifications are subject to change without
notice. Please check these pages for current information. |
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