Multilayer PCB Fabrication Services For Industrial Control / Automotive

DuxPCB is a specialist in manufacturing high-reliability Multilayer PCBs, ranging from standard 4-layer boards to complex 64-layer backplanes. As modern electronics demand higher speeds and smaller form factors, the structural integrity of your PCB becomes as important as the components on it.

We understand that a multilayer PCB is not just a stack of materials; it is a precision-engineered 3D interconnect system. Whether you need High-Tg materials for automotive applications or low-loss dielectrics for 5G telecommunications, DuxPCB provides the process stability and engineering support to ensure your stack-up is manufacturable and robust.

We bridge the gap between prototype agility and mass production consistency.

Manufacturing a multilayer board involves heat, pressure, and chemical processes that stress the material. DuxPCB employs rigorous process controls to mitigate these risks.

The heart of a multilayer PCB is the lamination press. We use state-of-the-art Vacuum Pressing systems with optimized thermal profiles. This ensures:

• Void-Free Bonding: Complete resin flow between high-copper layers.

• Thickness Control: Controlled dielectric thickness (Prepreg) to maintain accurate impedance values.

• Stress Relief: Preventing warpage and bow/twist during subsequent reflow assembly.

As layer counts increase, aligning the inner copper layers becomes critical. DuxPCB uses:

• Automatic Pin Lamination: Ensuring mechanical alignment.

• X-Ray Inspection: Verifying the alignment of inner layers after pressing but before drilling to compensate for any material shrinkage (scaling).

For thick multilayer boards (e.g., servers or backplanes), drilling and plating deep holes is a challenge. DuxPCB achieves Aspect Ratios of up to 20:1. Our high-throw power plating lines ensure that copper thickness in the center of the hole barrel meets IPC Class 2 or Class 3 requirements, preventing open circuits under thermal cycling.

Multilayer PCBs are often the backbone of high-speed digital designs. DuxPCB offers comprehensive engineering support for:

• Controlled Impedance: We calculate and verify trace widths and dielectric heights to match your target impedance (50Ω, 90Ω, 100Ω).

• Material Selection: We stock Low-Dk / Low-Df materials (such as Rogers 4350B, Panasonic Megtron 6) to minimize signal loss at high frequencies.

• Back Drilling: We mechanically remove the unused portion of plated through-holes (stubs) to reduce signal reflection in high-speed links (Gbps data rates).

Our multilayer solutions are trusted in industries requiring zero-failure reliability:

• Industrial Control: High-voltage power boards (Heavy Copper) and PLC controllers.

• Automotive: ECU, Radar, and BMS (Battery Management Systems).

• Telecommunications: Optical transport networks, Servers, and Base Stations.

• Medical: CT Scanners and MRI control boards.

We verify the integrity of your multilayer board from the inside out.

• AOI (Inner Layer): Automated Optical Inspection checks every inner layer for shorts or opens before lamination.

• X-Ray Inspection: Checks for layer shift and drill-to-copper alignment.

• Micro-section Analysis: A coupon is cut from every panel to verify plating thickness, dielectric spacing, and solder mask adhesion.

• TDR (Time Domain Reflectometry): Verifies impedance control traces against the design specifications.

Optimizing a multilayer stack-up can save significant costs and improve yield.

Send your Gerber files and Stack-up requirements to DuxPCB. Our CAM engineers will review your design for manufacturability (DFM) and suggest the most cost-effective material construction.