A 6-layer PCB is a multilayer board with four signal layers and two internal planes, usually ground and power.
The image on the left shows a standard 6-layer PCB stackup.This stackup is a balanced choice for many engineers.
It provides better EMI shielding than a 4-layer PCB. At the same time, it avoids the higher cost of 8-layer or more complex designs.
Real-World References
Real stackup configurations from HXDcircuit production orders — use these as a reference when specifying your 6-layer PCB material and surface finish.
| Finished Board Thickness: | 1.6+/-2%mm |
| Min. Line Width / Spacing | 6/6 mil |
| Material: | FR4 Tg135 |
| Surface Finish: | Immersion Gold |
| Certification | IPC-6012E Class II |
| No | Imp Type | Ctrl | Up Ref | Dn Ref | Trace W | Trace S | IMP_Req |
|---|---|---|---|---|---|---|---|
| 1 | Single-ended | L1 | L2 | 7 | 50 | ||
| 2 | Differential | ||||||
| 3 | Single-ended | L3 | L2 | L4 | 8 | 50 | |
| 4 | Differential | ||||||
| 5 | Single-ended | L4 | L3 | L5 | 8 | 50 | |
| 6 | Differential | ||||||
| 7 | Single-ended | L6 | L5 | 7 | 50 | ||
| 8 | Differential |
This is the most common 6-layer PCB stackup: Signal-GND-Sig-Sig-PWR-Signal. It uses ground and power planes to improve signal integrity. Inner layer routing reduces crosstalk, and the layer structure helps lower EMI. This design balances cost and high-speed performance. Click to view product images.
| Finished Board Thickness: | 1.6+/-10%mm |
| Min. Line Width / Spacing | 5/5 mil |
| Material: | FR4 TG170 |
| Surface Finish: | Immersion Gold |
| Certification | IPC-6012E Class II |
| No | Imp Type | Ctrl | Up Ref | Dn Ref | Trace W | Trace S | IMP_Req |
|---|---|---|---|---|---|---|---|
| 1 | Single-ended | L1 | L2 | 7 | 50 | ||
| 2 | Differential | L1 | L2 | 5.5 | 9.5 | 100 | |
| 3 | Single-ended | L3 | L2 | L5 | 8 | 50 | |
| 4 | Differential | L3 | L2 | L5 | 5.5 | 9.5 | 100 |
| 5 | Single-ended | L4 | L2 | L5 | 8 | 50 | |
| 6 | Differential | L4 | L2 | L5 | 5.5 | 9.5 | |
| 7 | Single-ended | L6 | L5 | 7 | 50 | ||
| 8 | Differential | L6 | L5 | 5.5 | 9.5 | 100 |
| Finished Board Thickness: | 1.41+/-10%mm |
| Min. Line Width / Spacing | 5/5 mil |
| Material: | FR4 TG135 |
| Surface Finish: | Immersion Gold |
| Certification | IPC-6012E Class II |
| impedance information | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| No. | type | control layer | ref layer | orig width (Mil) | orig space (Mil) | adjusted width (Mil) | adjusted space (Mil) | required impedance value (OHM) | actual impedance value (OHM) |
| 1 | single-ended | L3 | L2/L5 | 4.764 | 4.764 | 50 | 50.99±5 | ||
| 2 | single-ended | L4 | L2/L5 | 4.764 | 4.764 | 50 | 50.99±5 | ||
| 3 | differential | L3 | L2/L4 | 4.13 | 5 | 3.4 | 5.73 | 100 | 99.22±10 |
| 4 | single-ended | L1 | L2 | 4.764 | 4.3 | 50 | 49.84±5 | ||
| 5 | single-ended | L6 | L5 | 4.764 | 4.3 | 50 | 49.84±5 | ||
| 6 | differential | L1 | L2 | 4.748 | 5 | 3.4 | 6.348 | 100 | 99.84±10 |
Technical Specs
HXD provides 6-layer PCB manufacturing with stackup design, material options, copper thickness, and precision production for various applications.
| Items | Standard PCB | Advanced PCB |
|---|---|---|
| Finished Board Thickness | 16~128 mil (0.4mm – 3.2mm) | / |
| Max. Panel Size | 24 × 28.5″ (622mm × 723mm) | 24 × 40″ (622mm × 1000mm) |
| Laminate Materials | FR-4, CEM-3, Mid Tg, High Tg, High CTI, Halogen Free | / |
| Finished Board Thickness Tolerance | < 1.0mm ±0.10mm (±4mil) 1.0~1.6mm ±0.15mm (±6mil) |
< 1.0mm ±0.075mm (±3mil) 1.0~1.6mm ±0.10mm (±4mil) |
| Min. Inner Thin Core Thickness | 3mil (0.075mm) | / |
| Min. Inner Line Width / Spacing | 2.5 / 3.5 mil (0.0635 / 0.089mm) | 2.5 / 2.5 mil (0.0635mm) |
| Min. Outer Line Width / Spacing | 3.5 / 3.5 mil (0.089 / 0.089mm) | 3.0 / 3.0 mil (0.075 / 0.075mm) |
| Copper Foil Thickness | 12μm, 18μm, 35μm, 70μm, 105μm, 140μm (1/3oz – 4oz) | / |
| Min. Finished Hole Size | 0.2mm | 0.15mm |
| Min. Drilling Bit Size | 0.2mm | / |
| Max. Drilling Bit Size | 6.5mm | / |
| PTH Hole Copper Thickness | 20–30μm | 10–15μm |
| Max. Aspect Ratio | ≤ 10:1 | 12:1 |
| Min. Solder Mask Opening | 0.05mm (2mil) | 0.02mm (0.8mil) |
| Surface Finish | OSP, Peelable Solder Mask, Carbon Ink, HASL (lead free), ENIG, I-Ag, I-Tin | OSP, Peelable Solder Mask, Carbon Ink, HASL (lead free), ENIG, I-Ag, I-Tin |
| E-Test Voltage | 250 ± 5V | / |
| Max. E/T Insulation Resistance | 100 MΩ | / |
In addition to 6-layer PCBs, we produce 8-layer PCB, 10-layer PCB, and 12-layer PCB boards.These are ideal for complex and high-performance applications.
No MOQ — upload your Gerber files and receive a quote in minutes. Prototype quantities ship in 24 hours. ISO 9001 certified factory, global shipping available.
6-layer PCBs improve electrical performance and routing flexibility while keeping production practical and cost-efficient.
Dedicated ground and power planes reduce noise and signal loss. This helps maintain clean and stable signal transmission.
More layers allow better shielding between signals. This reduces electromagnetic interference in high-speed designs.
Extra layers provide more space for complex routing. Engineers can design tighter layouts without signal conflicts.
Internal power planes deliver consistent voltage across the board. This improves performance and system reliability.
More copper layers help spread heat efficiently. This supports stable operation in high-power applications.
Our Facility
HXD has more than 15 years of experience in multilayer PCB production. We keep investing in the latest manufacturing and inspection machines. We keep our equipment in great shape, including laser direct imaging and high-precision lamination presses. This ensures your boards are perfect every time.
Engineers use these 6-layer PCBs in PLC systems and motor controllers. They include dedicated ground planes to reduce noise and improve stability. This helps the systems run accurately in strong electromagnetic environments, such as modern smart factories.
Support 10GbE switches and high-speed routers with optimized impedance control. Our 6-layer stackups minimize crosstalk and signal loss, making them ideal for high-bandwidth telecommunications infrastructure.
In automotive applications, reliability is essential. 6-layer PCBs help reduce noise, manage heat, and improve system stability under vibration.
Our 6-layer PCBs are used in MRI and CT scanner interfaces. We often use Isola or Taconic materials to ensure strong signal integrity. This supports high-resolution medical imaging and accurate patient monitoring.
FAQ
