Shuoqiang Electronics manufactures 4–20 layer multilayer PCBs for industrial, telecom, automotive, and high-density electronic applications. We support controlled impedance, BGA and fine-pitch designs, High-Tg materials, ENIG, and prototype to volume production with stable process control and engineering support.
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SQPCB provides custom multilayer PCB manufacturing for prototypes, small batches, and volume production.
We manufacture 4–20 layer printed circuit boards for industrial control, communications, automotive electronics, medical equipment, power electronics, test instruments, and other demanding applications.
Our manufacturing capabilities include controlled impedance, high-Tg materials, blind and buried vias, resin-filled vias, via-in-pad, heavy copper, ENIG, and complex multilayer stackups.
With direct engineering communication and controlled production processes, we help customers identify manufacturing risks before production and achieve more stable PCB quality, delivery, and cost.
Need a multilayer PCB quotation?
Upload your Gerber files and specifications. Our engineering team will review the design and provide a quotation, lead time, and DFM feedback.
The following table provides an overview of our multilayer PCB manufacturing capabilities. Final capability depends on the layer structure, copper thickness, board thickness, hole design, material, and order quantity.
| Item | Manufacturing Capability |
|---|---|
| Layer Count | 4–20 layers |
| Base Materials | FR-4, High-Tg FR-4, Halogen-Free, Rogers and other high-frequency materials |
| Common High-Tg Materials | Shengyi S1000-2/S1000-2M, ITEQ IT180/IT180A, Isola 370HR |
| Finished Board Thickness | 0.4–5.0 mm, subject to stackup |
| Copper Thickness | 0.5–12 oz, subject to line width and spacing |
| Minimum Line/Space | Down to 3/3 mil, subject to copper thickness |
| Minimum Finished Hole | Subject to board thickness and aspect ratio |
| Controlled Impedance | Typical tolerance ±10% |
| Maximum Finished Board Size | Up to approximately 1,200 mm for suitable designs |
| Surface Finishes | Lead-Free HASL, HASL with Lead, ENIG, OSP, Immersion Silver, Immersion Tin, Hard Gold |
| Via Options | Through Via, Blind Via, Buried Via, Via-in-Pad, Resin-Filled Via, Copper-Capped Via |
| Solder Mask | Green, Black, Blue, Red, White, Yellow, Matte Black |
| Testing | Flying Probe, Fixture Test, AOI, Impedance Testing, Microsection Inspection |
| Order Quantity | Prototype, small batch, and volume production |
For designs close to the manufacturing limit, please send the Gerber files, stackup, impedance requirements, and material specifications for engineering evaluation.
A multilayer PCB is a printed circuit board containing three or more conductive copper layers separated by insulating dielectric materials.
In practical PCB manufacturing, the most common multilayer boards have 4, 6, 8, 10, 12, or more layers. The layers are aligned, laminated, drilled, plated, imaged, and electrically connected to create a complete circuit.
Compared with single-sided and double-sided PCBs, multilayer PCBs provide:
However, increasing the number of layers also increases material consumption, manufacturing steps, registration requirements, production cost, and reliability-control requirements.
The correct layer count should therefore be based on electrical performance, routing density, thermal requirements, reliability, and total manufacturing cost—not simply on the assumption that more layers are always better.
A typical 4-layer PCB contains two signal layers and two internal power or ground layers.
Four-layer boards are commonly used when a double-sided PCB no longer provides enough routing space or when better signal integrity and EMI control are required.
Common applications include:
For some projects, careful routing or the use of 0Ω resistors may help avoid an unnecessary increase from four to six layers.
A 6-layer PCB provides additional routing, power, or ground layers and supports more complex component layouts.
It is commonly selected for:
A properly designed 6-layer stackup can improve return-current paths, reduce electromagnetic interference, and provide better power integrity.
Higher-layer-count PCBs are used when the design requires greater routing density, multiple power domains, complex BGA fanout, controlled impedance, or advanced signal-integrity management.
These boards require tighter control of:
Early communication between the PCB designer and manufacturer is particularly important for high-layer-count designs.
HDI multilayer PCBs use microvias, blind vias, buried vias, sequential lamination, and fine-line circuitry to achieve higher interconnection density.
Via-in-pad technology places the via directly inside a component pad. For reliable SMT assembly, the via normally needs to be resin filled and copper capped to provide a flat, solderable surface.
HDI is useful for fine-pitch BGA and compact electronic products, but it also increases manufacturing complexity and cost. It should be selected when the design genuinely requires the additional routing density.
Multilayer PCBs can also be manufactured with increased copper thickness for power electronics, high-current circuits, industrial equipment, and thermal-management applications.
Heavy copper affects:
A 2 oz or heavier inner layer normally requires sufficient prepreg resin to fill the spaces between copper features. Copper distribution and stackup symmetry are also important for controlling warpage and lamination quality.
Multilayer PCBs often require more engineering confirmation than simple single-sided or double-sided boards.
Our team can review:
Direct communication helps reduce repeated confirmation and prevents avoidable manufacturing misunderstandings.
Lamination is one of the most important processes in multilayer PCB manufacturing.
In-house lamination provides better control over:
Controlling lamination internally also reduces transportation, handling, communication, and scheduling risks.
Laser Direct Imaging eliminates the need for traditional artwork film and improves image-registration accuracy.
LDI is particularly useful for:
It also reduces problems associated with film expansion, shrinkage, scratches, contamination, and manual alignment.
Solder mask registration becomes increasingly important as pad size and component pitch decrease.
Solder mask LDI uses board fiducials for direct exposure, helping improve alignment between solder mask openings and copper pads.
This is especially valuable for:
AOI is used to inspect circuit patterns for opens, shorts, missing copper, excessive copper, and other image defects.
Finished multilayer PCBs are electrically tested using flying-probe or fixture testing according to order quantity and production requirements.
Small orders and prototypes are normally suitable for flying-probe testing, while volume production may use dedicated test fixtures for higher efficiency.
We support:
This allows customers to use the same manufacturing partner from product development through commercial production.
The stackup determines the electrical, mechanical, and manufacturing structure of a multilayer PCB.
A good multilayer stackup should consider:
A symmetrical stackup helps reduce uneven mechanical stress during lamination and reflow.
Asymmetrical dielectric or copper structures may increase the risk of:
Large differences in copper distribution between layers may affect etching, plating, lamination, and board flatness.
Where possible, designers should balance copper across the board and between corresponding layers.
Copper balancing features may be added in unused areas, but they must not interfere with impedance, creepage, clearance, isolation, or electrical performance.
Prepreg provides insulation and resin between copper layers.
The manufacturer must consider:
Heavy inner-layer copper normally requires more resin to fill the spaces between copper features.
Controlled impedance depends on more than trace width.
Important factors include:
Solder mask can reduce impedance by approximately 1–3 ohms in some structures, so it should be included in the impedance calculation when necessary.
Customers should provide the target impedance, tolerance, layer, trace type, and reference plane. We can review the proposed stackup and adjust trace geometry according to the actual production structure.
Before production, engineers review the fabrication files, drill data, stackup, materials, copper thickness, surface finish, impedance requirements, and special notes.
Any conflicting or unclear requirements should be confirmed before material cutting.
The inner-layer circuit pattern is transferred to the copper-clad laminate using LDI or another controlled imaging process.
Unwanted copper is removed to create the required circuit pattern.
Etching compensation is adjusted according to copper thickness, line width, spacing, and process capability.
AOI checks the inner layers for circuit defects before lamination.
Finding defects at this stage prevents defective inner layers from being permanently laminated into the board.
The inner-layer copper surface is treated to improve bonding between the copper and prepreg during lamination.
Inner layers, prepreg, and copper foil are aligned and stacked according to the approved construction.
The stack is laminated under controlled temperature, pressure, vacuum, and time.
CNC drilling machines produce through holes and other mechanically drilled features.
Drill parameters must consider board thickness, hole diameter, material type, copper thickness, and aspect ratio.
The drilled holes are cleaned and treated before electroless and electrolytic copper plating.
Reliable hole-wall copper is essential because plated through holes connect multiple copper layers and must survive assembly and operating-temperature cycles.
The outer-layer circuit pattern is imaged, plated, and etched.
Fine features and heavy copper require different process compensation and production controls.
Liquid photoimageable solder mask is applied, exposed, developed, and cured.
Solder mask LDI helps improve opening alignment around BGA and fine-pitch pads.
The selected surface finish protects exposed copper and provides the required solderability or contact performance.
Common options include:
Boards are routed, V-scored, or otherwise profiled according to the fabrication drawing.
Electrical testing verifies continuity and isolation before final inspection and shipment.
Finished boards are checked for appearance, dimensions, marking, solder mask, surface finish, board flatness, and packaging requirements.
Vacuum packaging and desiccants can be used according to surface finish, storage, and shipping requirements.
Material selection should be based on operating temperature, thermal cycling, electrical performance, reliability, certification, and cost.
Standard FR-4 is suitable for many industrial, consumer, communication, and general electronic applications.
High-Tg materials provide improved thermal resistance and dimensional stability for:
Common options include Shengyi S1000-2/S1000-2M, ITEQ IT180/IT180A, and Isola 370HR.
Halogen-free laminates are available for projects with specific environmental, safety, or customer requirements.
The exact material brand and grade should be specified or approved before production.
Rogers and other high-frequency laminates can be used in multilayer or hybrid constructions for RF, microwave, radar, antenna, communication, and high-speed applications.
Hybrid constructions require careful evaluation of:
Multilayer PCB quality cannot be confirmed only by final appearance.
Important controls include:
For reliability-sensitive projects, customers should clearly specify the applicable IPC class, copper requirements, material grade, test method, acceptance criteria, and any special documentation requirements.
Lead time depends on layer count, material availability, copper thickness, via structure, surface finish, panel size, testing requirements, and order quantity.
Typical schedules include:
Urgent lead time begins after:
Customers with urgent delivery requirements should provide the target shipment date when requesting a quotation.
Multilayer PCBs are widely used in:
To receive an accurate quotation, please provide:
If the stackup has not been finalized, send the Gerber files, layer count, board thickness, copper thickness, and impedance requirements. Our engineering team can propose a manufacturable stackup for confirmation.
We manufacture multilayer PCBs from 4 to 20 layers. Final capability depends on board thickness, copper thickness, hole design, material, and other technical requirements.
Four- to six-layer prototypes can be completed as fast as 3 days when the material is available and all engineering details have been confirmed.
More complex boards require additional time for material preparation, sequential lamination, special via processing, surface finish, and testing.
Yes. Please provide the target impedance, tolerance, signal layer, reference plane, and preferred stackup.
We will review the construction using the actual material, dielectric thickness, and copper thickness before production.
Yes. Via-in-pad designs normally require resin filling and copper capping to create a flat, solderable pad surface.
Please identify all via-in-pad locations and specify the filling and capping requirements in the fabrication notes.
Yes. Blind and buried vias are available for suitable multilayer and HDI structures.
Please provide the layer-to-layer connection requirements so that the lamination sequence and manufacturing feasibility can be evaluated.
Available options include standard FR-4, high-Tg FR-4, halogen-free materials, Rogers, and other high-frequency laminates.
Common high-Tg options include Shengyi S1000-2/S1000-2M, ITEQ IT180/IT180A, and Isola 370HR.
The correct surface finish depends on component pitch, assembly process, storage period, solderability, contact requirements, reliability, and cost.
Yes. We support prototypes, small batches, repeat orders, and volume production.
Using the same manufacturer from prototype to mass production helps maintain material, stackup, and process consistency.
Yes. Our engineering team reviews the files and manufacturing requirements before production.
If we identify unclear specifications, design conflicts, or manufacturing risks, we will contact the customer for confirmation.
Common cost-reduction methods include:
The lowest board price is not always the lowest total cost. Stable yield, reliable delivery, and reduced assembly risk should also be considered.
Looking for a reliable multilayer PCB manufacturer for your next project?
SQPCB supports multilayer PCB prototypes, small batches, and volume production with direct engineering communication, controlled manufacturing, and flexible delivery options.
Please send us:
Our team will review your project and provide a quotation, production lead time, and DFM feedback.
Email: info@sqpcb.com WhatsApp: +86 136 0306 3656
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