4 Layer PCB

4 layers PCB generally has complex designs with thin spacing and line width, restrict manufacturing requirements and sometimes impedance or blind & buried vias are involved. In order to ensure the quality manufacturing of 4 layers PCB, you have to choose a reliable manufacturer. NOD Electronics based in China has been managing high-end circuit board fabrication for decades. We will send you best offer with cost efficiency.

4 layers pcb circuit board

Our Typical Manufacturing Capabilities of 4 Layer PCB Circuit Board

Total Pad SizeStandardAdvanced
Capture PadDrill + 0.008Drill + 0.006
Landing PadDrill + 0.008Drill + 0.006
BC Mechanical Drill (Type III)0.0080.006
Laser Drill Size0.004-0.0100.0025
Material Thickness0.00350.0025
Stacked ViaYesYes
Type I Capabilities single & Double DeepYesYes
Type II Capabilities Buried Vias with MicroviasYesYes
Type III CapabilitiesYesYes
Copper Filled MicroviaYesYes
Smallest Copper Filled Microvia0.0040.0025
Copper Filled Microvia Aspect Ratio0.75:11:01
Smallest Laser Microvia Hole Size0.0040.0025
Laser Via Aspect Ratio (Depth:Diameter)0.75:11:01

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4 Layer PCB Manufacturing Quality Control

We choose top sheet suppliers to ensure stable performance (general FR-4). During the PCB manufacturing process, automatic copper plating lines and high-speed drilling machines (brand:TMAX) to make accuracy and fast delivery guaranteed. All printed circuit board will be detected by advanced automatic flying probe machines (or test frame ) at subsequent stages to make sure each PCB is OK from inner circuits to outside shape.

4 layer PCB 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. Due to its complexity, we have built refined manufacturing process to fulfill our customer needs. Advanced facilities and responsive team would be making you satisfied well.

4 layer PCB

Layers4 Layer
Lead Time3-7 days
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.
Surface FinishTin\Lead or Silver
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.
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.
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.

Right now, do not hesitate. Please contact us to get an instant quote of 4 layer PCB circuit board and PCB assembly services.

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NOD Electronics - PCBA - PCBA Assembly Services

Address: Block 3, #20-8 Huanxi West Rd, Tianhe, Guangzhou 510660, China

Mobile: +86-1682-0101-507

E-Mail: sales@nod-pcba.com

Tel: +86-020-82515913