4 Layer Production

The 4 Layer – Production Service is designed for multi-layer circuits. These PCBs include the green solder mask layers and a white silkscreen layer. This is our best value when ordering large quantities of 4-layer boards, having a low per-square-inch cost and quantity discounts.

Multi-layer boards have many advantages over double-sided boards. They can be designed more compactly, they greatly improve noise immunity and are much easier to lay out.

Description

4 Layer – Production Service boards have top and bottom copper layers with all holes plated through. Sandwiched inside are Ground and Power planes. Through-hole pads can be connected to, or isolated from, the planes. These boards also have top and bottom solder mask layers, giving them a dark green color. On the top surface is a white silkscreen layer showing the component outlines. Select a 2 day, 3 day or one-week manufacturing time.

Choose a tin/lead or lead-free RoHS compliant finish:

Photo4LayerProdPCB_TL_800 Photo4LayerProdPCB_LF_800

3 Day Pricing

  • The cost depends mainly on the size and quantity of the boards. Our pricing formula is: $273 + ($0.80 * NumberOfBoards * BoardAreaInSquareInches) + ($1.00 * NumberOfBoards) + Shipping.
  • Boards with more than 25 holes per square inch require an extra fee of $0.01 for each additional hole. For pricing purposes, the minimum board area is 4 square inches.
  • The typical cost for shipping 2 boards within the U.S. by Second Day Air is $9.85.
  • Orders submitted Monday through Friday by 2:00pm ET are shipped in 3 business days.
  • Paying for your boards is easy by MasterCard, Visa or American Express.
Day Expedite Service
For faster delivery, select our 4 Layer – Production, 2 Day Expedite option. Orders submitted Monday through Friday by 2:00pm ET are shipped 2 business days later. Orders received after our 2:00pm cutoff are shipped the following day. Use the Compute Board Cost command within the ExpressPCB layout program to determine the exact cost. New! Lead Free is now available with Expedite.

5 Day Pricing

  • Our pricing formula for the 10 day option is: $273 + ($0.68 * NumberOfBoards * BoardAreaInSquareInches) + ($0.50 * NumberOfBoards) – QuantityDiscount + Shipping.
  • Single orders of 50 or more boards qualify for quantity discounts:
  • For pricing purposes, the minimum board area is 4 square inches.
  • Boards with more than 25 holes per square inch require an extra fee of $0.005 for each additional hole.
  • Orders submitted Monday through Friday by 2:00pm ET are shipped in 5 business days.
  • Payment by Mastercard, Visa or American Express.
Quantity Discount
2-49 0
50-99 11%
100-249 15%
250-499 19%
500-999 22%
1000-1999 25%
2000-up 26%

Manufacturing Specifications

ExpressPCB Manufacturing Specs PDF

 Production 4 Layer
Quantity2 and up
Layers4 Layer
Lead Time2 Day, 3 Day, 5 Day
Maximum Board SizeThe maximum board size we manufacture is 12 x 14 inches.
Minimum Board SizeMinimum dimension in height or width is 0.35 inches.Total board area must be greater than 0.4 square-inches. (i.e. smallest square board we can make is 0.64 x 0.64 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 or Silver BtnLearnAboutLeadFreeOption
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.
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 SlotsBoard perimeters are cut to shape using a 0.093″ router bit. Slots in the perimeter must be 0.100″ or wider. Narrower slots will not be milled correctly.
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.