Your Reliable Customer Multilayer PCB Manufacturer Since 2008

PCBMay is a professional multilayer PCB boards manufacturer in China, who provides many different types of multilayer PCBs for you.

  • Over 10 years multilayer PCB manufacturing experience
  • No minimum order quantity even 1 piece
  • Offer 24h quick turn service for prototype of multilayer PCB
  • Certified by UL from US and Canada.
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Multilayer PCB is Your Best Choice for Your Project

If you’re looking for a good multilayer PCB supplier, PCBMay is your best choice.

We could manufacture different types of multilayer PCB base on your requirement.

You could order from a prototype of multilayer PCB to test our quality at first, then place mass production order for us.

Please send us your Gerber file, we will offer the best price within 1-2 hours.

Types of Multilayer PCB Meet Your Requirments

4layer multilayer PCB

The 4 layer multilayer PCB is very popular and its stack-up is quite elaborate. Two inner layers, inner layers 1 and 2, are sandwiched between the top and bottom layers. There’re 4layer rigid boards or 4layer flex PCBs or 4layer flex-rigid PCBs.

6layer multilayer PCB

The 6 multilayer PCB stack up is very popular, normally, there’re top signal, inner signal, ground plane, power plane, inner signal and bottom signal, what’s more, sometimes there’re differ or single impedance controls among the layers.

8layer multilayer PCB

The 8 multilayer PCB stack-up offers ample routing space for multiple power islands. All signal layers have a minimum of one referencing power plane. The power and ground layer in the center offers good inter plane capacitance.

10layer multilayer PCB

The 10 multilayer PCB board is a circuit board that has 10 layers. They are fixed tightly together with strong mutual relations between each of the layers. PCBMay has more experience in making multilayer boards such as 10 layer PCB.

12layer multilayer PCB

The 12 multilayer PCB board offers the foundation for a modern automotive electronic circuit, 12layer stack up deals with specific requirements for tracking heights and material thickness in producing multi-layer PCBs.

14layer multilayer PCB

PCBMay can help you design custom 14 multilayer rigid printed circuit boards with the standard FR4 or high TG170 materials, even 14 layer with flex-rigid PCB with polyimide material, please don’t hesitate to send RFQ to our sales@pcbmay.com.

Why Choose PCBMay for Your Multilayer PCB

As a professional multilayer PCB manufacturer, PCBMay has advanced multilayer PCB types of equipment to manufacture high-quality printed circuit boards for your project. All our machines are from the USA and EU, what’s more, we have our own testing Lab. and also provide COC report for each project for you.

PCBMay is an expert to produce many types of multilayer PCBs for you, from 4layer to 40layer, so when you have these kinds of inquiries, please send them to us right now.

VPC Plating Line

Related Multilayer PCB Boards

16 Multilayer PCB
16layer Multilayer PCB
16 layer PCB is not like standard type of PCB,it consists of multiple layers and uses different prepregs and cores to laminate together, it is made from halogen-free material and the board thickness will be reached to be 7.0mm.
18layer Multilayer PCB
18layer Multilayer PCB
18 layer rigid-flex PCB with 12 layer flex PCBs are produced in a wide range of board materials. A few amongst them include FR4 (Tg – 135C, 145C, 170C), Rogers Ultralam 2000, Polyimide, Teflon, Black FR4, Arlon AR350,etc.
20layer Multilayer PCB
20layer Multilayer PCB
20 Layer PCBs are High Density Interconnect board with huge width and space, holes are more than 0.3mm. Our experienced team can manufacture the 20 Layer PCB with four planes and 6 signal layers.
22layer Multilayer PCB
22layer Multilayer PCB
22Layer PCB Stack up with Nelco 4000-13EP for all layers except layers 10-11 and 12-13 which requires MITSUI MC24M material,Surface finishing: Immersion Gold(3u''),Min trace width/spacing:6 /6 mil,Finished copper thickness: 2oz.
24layer multilayer PCB
24layer Multilayer PCB
24 layer boards for high density interconnects and backplanes are common, with around half being power and ground planes, with the rest being controlled impedance signal lines.
30layer multilayer PCB
30layer Multilayer PCB
The Capability of PCBMay is 1 – 24 layers standard, 30 layers advanced, 40 layers prototype,you will find more information from our capabilities in our webpage.
32layer multilayer PCB
32layer Multilayer PCB
Thickness: 4.8mm Surface finishing: LF HAL, Min trace width/spacing: 5 /5 mil, Finished copper: 1oz,Min hole size: 0.4mm,Materials: MEGTRON 6,Aspect Ratio:12
36layer multilayer PCB
36layer Multilayer PCB
Thickness: 6.0mm, Surface finishing: Immersion Gold, Min trace width/spacing: 4 /4 mil, Finished copper thickness: 2oz for outer layer,3oz for inner layer, Min hole size: 0.4mm.

Multilayer PCB Production Details As Following Up

Lamination
Brown Oxide
Etching
PTH Line
VCP Plating   AOI  Exposure E-Test
Item Capability
Layer Count 1-40layers
Base Material KBShengyiShengyiSF305FR408FR408HRIS410FR406GETEK370HRIT180ARogers4350BRogers4000PTFE Laminates(Rogers seriesTaconic seriesArlon seriesNelco series)Rogers/Taconic/Arlon/Nelco laminate with FR-4 material(including partial Ro4350B hybrid laminating with FR-4)
Board Type Backplane、HDI、High multi-layer 、blind&buried PCB、Embedded Capacitance、Embedded resistance board 、Heavy copper power PCB、Backdrill.
Board Thickness 0.2-5.0mm
Copper Thickness Min. 1/2 OZ, Max. 10 OZ
PTH Wall 25um(1mil)
Maximum Board Size 1100*500mm(43”*19”)
Min laser drilling size 4mil
Min. Spacing/Tracing 2.7mil/2.7mil
Solder Mask Green, Black, Blue, Red, White, Yellow,Purple matte/glossy
Surface Treatment Flash gold(electroplated gold)ENIGHard goldFlash goldHASL Lead freeOSPENEPIGSoft goldImmersion silverImmersion TinENIG+OSP,ENIG+Gold finger,Flash gold(electroplated gold)+Gold finger,Immersion silver+Gold finger,Immersion Tin+Gold finger.
Min. Annular Ring 3mil
Aspect ratio 10:1(HASL Lead freeHASL LeadENIGImmersion TinImmersion silverENEPIG);8:1(OSP)
Impedance control ±5ohm(<50ohm), ±10%(≥50ohm)
Other Techniques Blind/Buried Via
Gold Fingers
Press Fit
Via in Pad
Electrical Test

Here there’re many laminate material datasheets, they’re useful and helpful for you, please see them:

SUPPLIER PCB LAMINATE TYPE MATERIAL DATASHEET TG TD DK(1MHZ) DK(1GHZ) DK(10GHZ)
KB KB-6160 FR4 DOWNLOAD 135 305 4.35
KB-6160A FR4 DOWNLOAD 135 305 4.35
KB-6160C FR4 DOWNLOAD 135 314 4.7
KB-6150
KB-6150C
FR4 DOWNLOAD 132 305 4.6
KB-6164 FR4 DOWNLOAD 142 330 4.8
KB-6164F FR4 DOWNLOAD 145 340 4.8
KB-6165F FR4 DOWNLOAD 150 346 4.8
KB-6167F FR4 DOWNLOAD 170 349 4.8
SHENGYI S1141 FR4 DOWNLOAD 135 310 4.6
S1141KF FR4 DOWNLOAD 140 350 4.7
S1000 FR4 DOWNLOAD 155 335 4.9
S1170 FR4 DOWNLOAD 170 335 4.6
S1000-2 FR4 DOWNLOAD 170 335 4.8
S1155 FR4 DOWNLOAD 135 370 4.7
ITEQ IT-158 FR4 DOWNLOAD 150 340 4.6-4.8
IT-180 FR4 DOWNLOAD 180 350 4.5-4.7
TUC TU-768 FR4 DOWNLOAD 180 350 4.3-4.4 4.3
TU-872 Modified Epoxy DOWNLOAD 200 340 3.8-4.0 3.8
ROGERS RO 3003 Cer/PTFE DOWNLOAD 500 3
RO 3010 Cer/PTFE DOWNLOAD 500 10.2
RO 4003 Hydrocarbon/Cer DOWNLOAD >280 425 3.38
RO 4350B Hydrocarbon/Cer DOWNLOAD >280 390 3.48
RT/duroid 5880 PTFE/Glass DOWNLOAD 500 2.2
ISOLA Polyclad 370HR FR4 DOWNLOAD 170 340 4.8-5.1
FR406-HR FR4 DOWNLOAD 190 325 3.91 3.86 3.81
FR408-HR FR4 DOWNLOAD 200 360 3.72 3.69 3.65
P96 Polyimide DOWNLOAD 260 416 3.78 3.73
Hitachi MCL-BE- 67G Modified Epoxy DOWNLOAD 140 340 4.9 4.4
MCL-E-679F FR4 DOWNLOAD 170 350 4.2-4.4 4.3-4.5
MCL-LX-67Y Special Laminate DOWNLOAD 185-195 325-345 3.4-3.6
Nelco N4000-13 Modified Epoxy DOWNLOAD 210-240 365 3.7 3.6
N4000-13EP Modified Epoxy DOWNLOAD 210-240 350 3.4 3.2
N4000-13SI Modified Epoxy DOWNLOAD 210-240 350 3.4 3.2
N4000-13EP SI Modified Epoxy DOWNLOAD 210-240 350 3.4 3.2
Taconic TLX-6 PTFE DOWNLOAD 2.65
TLX-7 PTFE DOWNLOAD 2.6
TLX-8 PTFE DOWNLOAD 2.55
TLX-9 PTFE DOWNLOAD 2.45
RF35 PTFE DOWNLOAD <315 3.5 3.5
TLC-27 PTFE DOWNLOAD 2.75
TLC-30 PTFE DOWNLOAD 3
TLC-32 PTFE DOWNLOAD 3.2
Arlon Arlon 25N Cer DOWNLOAD 260 3.38
Arlon 25FR Cer DOWNLOAD 260 3.58
Arlon 33N Polymide DOWNLOAD >250 353 4
Arlon 35N Polymide DOWNLOAD >250 363 4.2
Arlon 85N Polymide DOWNLOAD 250 387 4.2
Stablcor ST325 DOWNLOAD Thermal conductivity:75w/m.k(with 1oz copper)
ST10 DOWNLOAD Thermal conductivity:325w/m.k(with 1oz copper)
Panasonic R-1566W FR4 DOWNLOAD 140 330 4.95 4.7 4.65
Ventec VT-901 Polymide DOWNLOAD 250 390 4.2-4.5 4.0-4.3
VT-90H Polymide DOWNLOAD 250 390 4.2-4.5 4.0-4.3
Bergquist ht-04503 DOWNLOAD Thermal conductivity:2.2w/m.k(with 1oz copper)

Delivery

PCBMay offers flexible shipping methods for our customers, you may choose from one of the methods below.

1. DHL

DHL offers international express services in over 220 countries.
DHL partners with PCBMay and offers very competitive rates to customers of PCBMay.
It normally takes 3-7 business days for the package to be delivered around the world.

DHL Forwarder

2. UPS

UPS gets the facts and figures about the world’s largest package delivery company and one of the leading global providers of specialized transportation and logistics services.
It normally takes 3-7 business days to deliver a package to most of the addresses in the world.

UPS Forwarder

3. TNT

TNT has 56,000 employees in 61 countries.
It takes 4-9 business days to deliver the packages to the hands
of our customers.

TNT Forwarder

4. FedEx

FedEx offers delivery solutions for customers around the world.
It takes 4-7 business days to deliver the packages to the hands
of our customers.

Fedex Forwarder

5. Air, Sea/Air, and Sea

If your order is of large volume with PCBMay, you can also choose
to ship via air, sea/air combined, and sea when necessary.
Please contact your sales representative for shipping solutions.

Note: if you need others, please contact your sales representative for shipping solutions.

On our website you can use the following payment methods:

Telegraphic Transfer(TT): A telegraphic transfer (TT) is an electronic method of transferring funds utilized primarily for overseas wire transactions. It’s very convenient to transfer.

Bank/Wire transfer: To pay by wire transfer using your bank account, you need to visit your nearest bank branch with the wire transfer information. Your payment will be completed 3-5 business days after you have finished the money transfer.

Paypal: Pay easily, fast and secure with PayPal. many other credit and debit cards via PayPal.

Credit Card: You can pay with credit card: Visa, Visa Electron, MasterCard, Maestro.

    Your Best Multilayer PCB Supplier

    Are you looking for a reliable multilayer PCB supplier? PCBMay is the right place for you and could help you to produce different types of multilayer PCB.

    We have over 10 years of manufacturing experience for your multilayer PCB, from 4 layers to 40layer multilayer PCB.

    Furthermore, we could produce the prototype of a multilayer PCB within 24h.

    There’re two plants one is in Shenzhen and another is in Meizhou, which could meet your different multilayer PCB demands.

    PCBMay could provide a test report for each project and you will know the details of each process.

    Multilayer PCB: The Ultimate FAQ Guide

    Printed Circuit Boards (PCBs) are an integral part of almost all electronic applications.

    Without PCBs, the electronics industry can’t manufacture products. But what manufacturing techniques make these PCBs robust enough to hold circuits and run them smoothly?

    On a commercial scale, PCB manufacturing is quite detailed and involves extensive use of technical procedures.

    The Multilayer PCB manufacturing process starts with Computer-Aided Design (CAD) of the circuit, later, this design is printed onto the PCB and the copper layers are removed from unwanted regions.

    The board is drilled for through-hole components. Later the board goes through testing and once clear, it is ready for component assembling. The procedure varies depending upon the type of PCB and components.

    A multilayer PCB is a board that has a conductor layer (inner layer) inside the board. In addition to the component side and the solder side, and is usually used for a power supply system. As a result, the low impedance due to the wide pattern area and the parallel plate capacitance between the power supply layers form a decoupling effect.

    Multilayer PCB Stack up

    Multilayer PCB Stack Up

    What is the Difference Among Various PCB Boards Layers?

    The structure of the printed circuit board depends on the number of mounted components.

    If it is sufficient to mount the components on only one side of the board, it will be a single-sided board. And if you want to mount it on both sides, it will be a double-sided board. Single and double-sided circuits: things to know.

    What is a Single Layer PCB?

    When we talk about a ‘monolayer’ circuit, we are referring to the simplest model, the single-sided one: it requires that there is a layer of material, with conductive tracks that wind on a single side.

    The most interesting elements relating to this type of circuit are those relating to the ease of assembly and the reduced costs as regards machining operations.

    These are products that are used, for example, in household appliances and in general, are perfect for projects linked to large consumption.

    Even intervening to repair the equipment, in the presence of single-sided circuits, is easier.

    What is Double Layer PCB?

    On the other hand, we take into consideration the double-sided circuits (those with two layers) they appear to be more flexible and with a decidedly reduced board size: they are probably the most common on the market.

    Thanks to them – and their wide application flexibility – many and distinct needs can be interpreted in any technological field.

    The reference is in particular to electronics for motors, but also to the IT and electro-medical sectors.

    Since it is possible to exploit the two faces, an optimization of spaces is configured and consequently an interesting reduction of costs. With regard to these printed circuits, we should not overlook the wide possibility of customization, linked to the customer’s needs and the relative budget available.

    Single layer and Double sided

    Single layer and Double sided Stack Up

    What is Multilayer PCB

    Multilayer PCB is a circuit board that has more than two layers.

    Unlike a Double-Sided PCB which only has two conductive layers of material, all multilayer PCBs must have at least three layers of conductive material that are buried in the center of the material.

    It may happen that a single or even a double layer is not sufficient to satisfy certain application needs.

    The solution, in this case, is represented by the use of multilayer PCB.

    The latter, of course, see the presence of a variable and higher number of layers of material: from 4 layers, 6 layers, 8layer, and more layers.

    In these particular products, the tracks cross the layers, which allows optimizing the available space?

    This results in interesting and greater compactness of the circuit.

    This latter aspect is particularly interesting in the case of devices with small dimensions.

    Multilayer PCB

    Multilayer PCB

    Which Types of Multilayer PCBs

    The PCBs are available in different forms and find applications in different electronic gadgets, across the industries. The classification is done based on its application,  manufacturing process, and the material used.

    Multilayer PCB Types

    Multilayer PCB Types

    The PCB can be classified into the following types:

    How to Design Multilayer PCB?

    By patterning the board in multiple layers, the pattern is placed in the inner layer, increasing the area where components can be mounted. This is the advantage of the multilayer PCB board.

    The through-holes used in the two-layer board will be connected to the inner layer if left untouched.

    Therefore, in the case of through holes such as signal lines that do not connect to the inner layer, it is necessary to provide a pattern that does not connect to the inner layer.

    Multilayer PCB Design

    Multilayer PCB Design

    Also, when it is desired to connect to the inner layer such as the power supply system, if such a pattern is not provided, the through-hole is directly connected to the conductor of the inner layer. So the connection is made.

    However, in such a connection, when soldering by inserting the component into the through-hole there, it is difficult to solder because heat does not easily transfer.

    Therefore, so-called thermal pads are connected in a cross pattern.

    How Are Multilayer PCBs Manufacturing?

    Multilayer PCB – A PCB consisting of multiple layers of dielectric with conductive patterns between the layers and on the outside.

    Manufacturing of multilayer printed circuit boards consists of creating separate layers according to the technologies of single and double-sided boards and their subsequent joining by pressing.

    The layers are joined using a specialized sheet material based on resin – prepreg, which has adhesive properties.

    Switching of conductors of different layers is carried out using plated holes, which can be through, hidden (when switching two or more layers inside the board), or blind (when switching one outer layer with one or more inner layers).

    The number of layers in multilayer boards is limited by the:

    • Overall board thickness
    • The ability to align layers
    • The reliability of the plated holes

    Multilayer PCB with about 20 layers is widespread.

    Multi layer PCB

    Multi-layer PCB

    How Is A Multilayer PCB Made?

    To produce a multi-layer PCB, alternating layers of epoxy-infused fiberglass sheet called prepreg and conductive core materials are laminated together under high temperature and pressure using a hydraulic press.

    The pressure and heat cause the prepreg to melt and join the layers together.

    Multilayer PCB Manufacturing Process Steps

    On a commercial scale, Printed Circuit Board manufacturing involves a series of extensively technical steps.

    From design to development, each step is carried out according to the defined industrial standards.

    The following steps are the major phases a PCB goes through before it is ready for assembling components.

    Step 1: Design and Layout Development

    PCB manufacturing starts with the development of the circuit’s soft layout using commercial software like Altium.

    The designer creates a simulation of circuit design for extracting the CAD of the circuit.

    When designing a PCB layout, one should take care of certain things, such as the route width, elements, and position. Each detail requires extensive care; even a slight mistake can cause PCB malfunctioning.

    On the commercial scale, PCB designing tools are available in a wide range.

    The designers usually extract PCB designs in Gerber format.

    It encodes all the details, such as the number of copper layers, the number of masks required for soldering, and all other notations. When the program simulates a design, all the details can be easily inspected.

    PCB Layout

    PCB Layout

    Step 2: PCB Design Printing

    The PCB design can be printed after all inspections are complete.

    Contrary to other plans, PCB prints do not appear on a standard paper, such as the engineering drawing.

    A plotter printer produces the PCB film. The plotter uses extremely accurate printing machinery to deliver an extensive film of the design.

    Two ink colors represent the inner layer: The first is black ink used in copper paths and PCB circuits, and the second one is clear ink, which represents the PCB’s non-conductive areas and fiberglass base.

    This mode is reversed in the case of outer layers in which clear ink refers to the copper pathway line, but black ink shows regions in which copper is removed.

    Every layer of the PCB and the corresponding solder mask is given a film, so four sheets are needed for a simple two-layer PCB — one for every layer and the one apiece for each solder mask.

    After the film is printed, it’s all lined up, and a hole is drilled in it, known as a registration hole. The recording hole is a reference for the later alignment of the films.

    Step 3: Inner layers Printing

    The copper is pre-connected to the same laminate portion after the PCB design is printed on the laminate and used as the PCB structure.

    The copper is then etched to display the blueprint of the earlier edition. Then, a photo-sensitive film called resist is covers a laminate panel.

    The resistance is made of a layer of photo-resistive chemicals that hardens when exposed to ultraviolet light. It enables the developers to precisely match the position of blueprint images with those printed to the photoresist.

    After alignment of resist and laminate, they absorb ultraviolet light. The ultraviolet light passes the translucent sections of the film, which hardens the photoresist.

    It exposes the copper patches that need to be kept as pathways. The black ink prevents light from reaching areas that are not to be hardened. This ink is removable.

    Inner Layer

    Inner Layer

    Step 4: Unwanted Copper Removal

    Once the wanted and unwanted copper patches are markets, the unnecessary copper removal begins.

    The board is submerged or treated with an alkaline solution which reduces the copper strength and eats it off.

    All exposed copper is extracted in the copper solvent solution bath. In the meantime, under the hardened layer of photoresist, the desired copper is entirely safe and covered.

    But since PCB comes in a variety of substrates and not all copper PCBs are the same, the process can slightly vary depending upon the concentration of copper.

    Short-heightened boards need more copper solvents and different exposure lengths whereas large copper boards need more consideration in the spacing of the track.

    Now that the solvent has eliminated the unwanted copper, the hardened resist safeguarding the remaining copper requires washing. Another solvent carries out this job.

    With just the copper tracks available on PCB, the board now starts appearing in the desired shape.

    Step 5: Board Inspection and Layer Alignment

    Once the board is thoroughly cleaned, the board needs to be inspected. For aligning the inner and outer layers, the holes are used.

    The developer punches the board using an optical punch to align the layers. The punch pushes in a pin through the holes to match the PCB layers.

    The Automated Optical Inspection (AOI) machine is used for inspection afterward to ensure that there are no faults.

    This is an extremely critical step since any defects that occur can never be resolved until the layers are permanently bound.

    The machine compares the inspected PCB to an extended Gerber version for further confirmation.

    After the PCB passes the AOI inspection, it qualifies for the layers’ lamination stage.

    Step 6: Layer Lamination

    PCB lamination is performed in two stages: the lay-up step and the lamination step.

    The external part of the PCB is made from fiberglass pre-soaked with an epoxy resin.

    A thin copper foil layer, which now contains gravures for the copper traces, is filled with the original substrate. When external and internal layers are ready, it is time to bind them.

    The sandwiching is performed on a special press table with metal clamps.

    Using special screws, each layer is fitted onto the table. The manufacturer begins by inserting pre-impregnated resin, also known as prepreg resin on the table alignment basin.

    On the other side, the copper foil comes along with other sheets of pre-impregnated resin that are finished with a strip of cotton.

    Now the stack is ready to be pressed once the copper press plate is in place.

    The manufacturer passes it to a mechanical press and pushes it down, together with the layers. Then, the pins are forced down through the layer stack to make sure they are accurately fixed.

    The PCB stack is then taken to the next press, a laminating press where the layers are adjusted.

    The lamination press uses a pair of heated plates to apply heat and pressure for the stacking of layers.

    The epoxy within the prepreg melts by the heat of plates, and by fusing the piles together.

    Once the layers of the PCB are pressed together, a little unpacking is required. The technician has to remove the top press plate and the pins to release the PCB.

    Step 7: Drilling

    Before the drilling begins, X-ray equipment is used to detect drill spots.

    Registered holes are then drilled to protect the PCB stack until individual holes are drawn.

    When it comes to drilling these holes, a computer-guided drill is used as per the design of the extended Gerber file.

    Upon drilling completion, any copper that remains at the boundaries is extracted.

    PCB-Drilling

    PCB Drilling

    Step 8: Copper Plating

    After the PCB is drilled, a chemical is used for fusing together all layers of the PCB.

    Later, the PCB is bathed in a variety of chemicals after being thoroughly washed.

    The panel is then coated with a micron-thick copper sheet put on the top layer and in the holes only drilled.

    They are used to expose the fiberglass substrate; making up the panel’s insides before the holes are filled with copper.

    The copper holes in the walls of the previously drilled holes are bathed.

    VCP Plating Line

    VCP Plating Line

    Step 9: Imaging and Photo-resistive Plating

    In this phase, a new layer of photoresist is applied but only to the external layer since it still has to be imaged.

    After the exterior layers are coated in photoresist and imaged, the internal layer of the PCB is plated precisely as in the last stage.

    However, the outer layers receive the same process as a tin plate to guard the copper against the external layer.

    Step 10: Etching

    Before the external layer is etched, a tin guard is used to secure copper.

    The unwanted copper is eliminated using the same copper solvent which was used earlier.

    After the etching process, the PCB connections are set correctly and it is ready for solder masking.

    pcb etching

    PCB Etching

    Step 11: Solder Masking

    The panels are washed to ensure that they are ready for use.

    After cleaning the PCB plates, an ink epoxy and a solder mask film are added.

    The panels are exposed to ultraviolet light to differentiate certain areas of the solder mask.

    The PCB is then put into an oven and warmed so that the solder mask may cure after the undesirable pieces of solder.

    Soldermask

    PCB Soldermask

    Step 12: Surface Finishing

    This stage involves chemically plating the board with gold or silver to add an additional solder capability to the PCB.

    During this point, some PCBs also receive hot air pads. The appropriate level of hot air helps maintain uniform pads.

    This process ends with a smooth surface finishing.

    Immersion Gold

    Immersion Gold

    Step 13: Silkscreening

    The silk-screening process labels all the critical information on the PCB.

    For example, the manufacturer’s remarks, company ID number, and warning labels.

    It is necessary since the PCBs have to be assembled, tested, and maintained in the future; the labeled information helps locate component positions.

    Step 14: Electrical Testing

    After the PCB goes through all the above steps, it qualifies for an electrical test to ensure its functionality.

    Mainly, the circuit continuity and insulation tests are performed.

    The continuity test checks if all short-circuit connections are closed (as needed), whereas the circuit insulation test checks the different sections of the PCBs that are designed to be insulated.

    While electrical tests are primarily designed to guarantee functionality, they also evaluate how well the initial PCB design was supported in the production phase.

    E-test

    Automatic E-test

    Step 15: Scoring and Profiling

    Cutting and scoring the PCB is the last step in the manufacturing process, and then the PCB goes through a final test.

    The PCB can be cut from the original panels in two ways:

    First, using CNC equipment (which cuts tiny tabs around PCB edges), and the second one is using a V-groove, (which cuts the diagonal channel along the board sides).

    PCB panels are usually routed and scored out with a single board or larger arrays, where necessary, to split off the board after assembling.

    Till this step, the PCB has been just manufactured, it still needs to be assembled with necessary components for complete functionality.

    Moreover, after assembling the PCB goes through a series of tests to ensure it functions as needed.

    Evidently, PCB manufacturing is an extensively technical process.

    Routing PCB

    Routing PCB Machines

    Step 14: Vacuum Package

    “PCB circuit board packaging” is crucial to the procedure, with moisture sensitive requirements, packaging requirements of sealing, desiccant, pumping air into a vacuum state.

    But a lot of PCB company for this final process didn’t pay attention to, so a lot of the work is simple, using the PCB are not under good protection, leads to problems such as PCB board surface is easy to damage or friction.

    Packing PCB

    Packing PCB

    Many Advantages of Multilayer PCB Boards

    • Over 12 years of multilayer PCB manufacturing experience.
    • Over 80 technical engineering to support your electronic development and manufacturing.
    • No MOQ for new orders, even one piece.
    • Quick turn/express order within 24hours.
    • 100% E-test and AOI inspection.
    • UL, RoHS, REACH, and ISO Certifications.
    • Providing Micro-section, soldering sample, and COC report.
    • Shipping by international forwarder UPS, FedEx, DHL.
    • 7/24 online support for your business.

    When we talk about multi-layer PCBs, they are designed for various applications.

    Some applications required multilayers. Here are some more benefits of multi-layer PCBs.

    Small Size

    One of the most prominent and lauded benefits of using multilayer PCBs lies in their size.

    Because of their layered design, multilayer PCBs are inherently smaller than other PCBs with similar functionality.

    This presents a major benefit to modern electronics, as the current trend is working toward smaller, more compact yet more powerful gadgets like smartphones, laptops, tablets, and wearables.

    Lightweight Construction

    With smaller PCBs comes less weight, especially as the multiple connectors required to interlink separate single and double-layered PCBs are eliminated in favor of a multilayered design.

    This, again, is beneficial for modern electronics, which are geared more toward mobility.

    High-Quality

    Due to the amount of work and planning that must go into the creation of multilayer PCBs, these types of PCBs tend to be better in quality than single and double-layer PCBs. They also tend to be more reliable as a result.

    Increased Durability

    Multilayer PCBs tend to be durable by their nature.

    Not only do these multilayer PCBs have to withstand their own weight, but they must also be able to handle the heat and pressure used to bind them together.

    On top of these factors, multilayer PCBs use multiple layers of insulation between circuit layers, binding it all together with a prepreg bonding agent and protective materials.

    Enhanced Flexibility

    Though this does not apply to all multilayer PCB assemblies, some do use flexible construction techniques, resulting in a flexible multilayer PCB.

    This can be a highly desirable trait for applications where mild bending and flexing may occur on a semi-regular basis.

    Again, this does not apply to all multilayer PCBs, and the more layers incorporated into a flexible PCB, the less flexible the PCB becomes.

    Single Connection Point

    Using multiple PCB components would require multiple connection points.

    Multi-layer boards, on the other hand, are designed to work with a single connection point, simplifying the design of the electronic device and further reducing the weight.

    When deciding whether to use more than one single-sided board vs. just one multi-layer printed circuit board, the multi-layer board is usually the best choice.

    Multi-Layer PCB Disadvantage

    Multi-functionality and other improved features of multi-layer boards come with a price. The high price and other features may not be suitable for every project.

    High Cost

    Design and manufacturing of multi-layer boards are more expensive than one or two-layer boards.

    Manufacturing multi-layer boards require more resources, more time, and more skill which increases the price.

    Design and Production Complications

    Designing and manufacturing the process of multi-layer boards is a more complicated process than single-layer boards.

    For multi-layer manufacturing, highly skilled designers with advanced specialized equipment.

    While manufacturing you will face difficulties in the process if you don’t have enough resources available.

    Availability

    Because of the specialization multi-layer boards require, not every manufacturer or supplier can reliably produce or provide them.

    You might realize it’s harder to find the right company to work with for designing, manufacturing, or repairing a board with a high number of layers.

    If a board needs repairs, it might also be more difficult to find someone capable of fixing it.

    Long Lead Time

    Designing and producing multi-layer boards also takes more time than making single-layer boards.

    There are more parts to consider, which all have to be secured to each other to form one board out of the various layers.

    These processes are also more involved, which adds to the lead time.

    If you need your boards made quickly, using multi-layer PCBs might not work for you.

    If a mistake occurs during the production process or you want to change the design, reworking can be extremely time-consuming and maybe impossible without replacing parts, increasing material costs.

    Complex Repairs

    Multi-layer PCBs are very reliable but if anything happens the repairing is very difficult or sometimes impossible.

    If there is a problem with an electronic component or if the board itself gets damaged, it is hard to find the problem because it is inside layers and the vias are not visible from outside.

    The more number of components onboard makes repairing difficult and very time-consuming.

    What are the Major Applications of Multilayer PCB Boards?

    Multilayer PCBs are used to design complex devices that require high component density.

    The number of layers depends entirely on the complexity of the task of the PCB designer. Computers, File servers, Data storage, Signal transmission, Cell phone transmission, Cell phone repeaters, GPS technology, Industrial controls, Satellite systems, Handheld devices, Test equipment, X-ray equipment, Heart monitors, Cat scan technology, Atomic accelerators, Central fire alarm systems, Fiber optic receptors, Power supply, Medical devices, Nuclear detection systems, Space probe equipment, Weather analysis, etc.

    Multilayer PCBs can contain up to 40 layers.

    It provides a high specific density of printed conductors and pads. Other advantages of printed circuit boards of this type include the reduction in the length of the conductors.

    A multilayer printed circuit board consists of a series of superimposed layers. In which are formed connecting conductors for transmitting signals, conductive surfaces for supplying voltages, grounding circuits, and pads or tabs for connecting leads.

    Often, a heat-conducting material is included in the structure of a multilayer board for cooling.  A connector is installed on one of the edges of the board.

    It significantly increases the speed (for example, the speed of data processing in a computer). Also, multilayer printed circuit boards allow shielding of AC circuits.

    1) Dielectric.
    2) Protective layer (mask).
    3) Contact hole.
    4) Conductive track.

    PCBMay is an Experienced Multilayer PCB Manufacturer

    PCBMay has been producing Multilayer PCBs for over 12 years.

    Over the years, we have seen all types of multilayer constructions from various industries, answered all types of multilayer questions, and solved all types of problems with multilayer PCBs.

    Questions asking from PCBMay as following:

    How Many Layers Do You Produce In Your Factory?

    We can produce from a single layer, double layer, multilayer PCB until 40layers.

    How Do I Know If My PCB Is Multilayer?

    Using a bright light, it’s easy to see if a board has inner layers even if it doesn’t have blind vias.

    Find someplace on the board where there aren’t traces/planes on the visible, outer layers and see if you can see light through it.

    If it’s blocked in some places, that’s probably copper.

    What Is The Standard Delivery Time For Multilayer Boards?

    We can produce the prototype of multi-layer boards with quick turn 48h and one week for a standard leading time,2-3 weeks for mass production of multilayer PCBs.

    What Color Is For The Soldermask And Are There Other Colors Available?

    Our standard color for solder masks is green.

    We can also provide solder masks in red, white, yellow, purple, blue, or black, also matte green, matte black, matter red, or matter blue for an additional amount.

    What Is The Maximum Size PCB You Can Produce?

    The largest size PCB we can produce is 43″ x 19″ or 1100mm x 500mm.

    What Is The Standard Board Thickness And Can You Produce 2.4mm Or 3.2mm Thick Boards?

    The standard board thickness is 1.6mm, this provides a good balance between strength and weight. A thickness of 2.4mm or 3.2mm is also available.

    What Copper Thickness Do You Use And Are There Other Thicknesses Available?

    The copper thickness of most PCB boards is 35um(1oz), our capability can reach 12oz.

    Is There Any Minimum Order Quantity?

    No, we can produce 1 to 10,000 pieces, what’s more, there is also no minimum order surcharge or additional fees.

    Conclusion

    Electronics have evolved rapidly in the past few decades.

    In the 1990s, mobile phones were used only to make calls or receive msgs but today, we have literally incorporated a complete computer in these small mobile devices and it won’t be possible without using Multilayer PCBs.

    Multilayer PCB with SMD components brings smartness to electronic products by making them small-sized and thus handier.

    The modern world is trending towards miniaturization and multilayer PCB is playing the role of a backbone.

    Multilayer PCB design plays an important role in determining the functional and thermal performance of the complete electronic system, and as multilayer PCB is designed in PCB industries under modern PCB machines, thus it fulfills all standards and is durable as compared to simple PCB boards.

    Advanced electronic products use multilayer PCB because it allows a large number of components to be incorporated on a single board, hence allowing the higher component density.

    While there are several drawbacks to using multilayer PCBs over single and double-layer options, such as increased costs, design times, and production inputs, these costs are becoming more accepted in today’s world.

    Functionality is largely favored over cost, and people are willing to pay more for high-capacity electronics.

    Additionally, as the technology becomes increasingly mainstream, production techniques and machinery will eventually become less expensive, especially as new techniques arrive in the industry.

    See What Our Customers Say

    Our goal is to make our customers be satisfied with their quality. Since 2008, we’ve been manufacturing printed circuit boards and assembly for our customers. We will help you make your PCBs from prototype through production from layout to finished product, on time and within spec.

    Shirley Malhotra, Design Engineer from the USA

    I’ve been using PCBMay for some years now, and just like all the projects I’ve done with PCBMay, there were no surprises. Everything went just as it was supposed to, and the board is performing fine. You’re lucky to work for such a great company. What’s more, we’re working with them for many different multilayer boards, excellent service.

    Kylo James, CEO from the UK

    We consider PCBMay a partner rather than a vendor. We have worked with many PCB or assembly vendors over the years and have moved all of our business to PCBMay as their quality and on-time delivery are unmatched. They manufacture different PCBs and assemblies, and the level of expertise that PCBMay has in both PCB fabrication and assembly has had a positive, meaningful impact on our business.

    Linda Perez, Purchasing Coordinator from Germany

    PCBMay has always been very responsive in meeting our quick-turn PCB fabrication and board assembly schedules for several years while at the same time focusing on delivering quality products. Our experience in dealing with PCBMay sales has been very positive.

    Ella Ross, Hardwear Developer from the USA

    The boards are great and they work perfectly. We look forward to doing more business with you in the future. We are in the process of re-designing some of our existing boards and will definitely be giving you the opportunity to quote on them.

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