HDI Ready

6-Layer Flexible PCB Solutions

High-performance multilayer flex for the most demanding applications. Full HDI capability, multiple signal/power plane combinations, and advanced via structures for cutting-edge electronics.

6-Layer Flex PCB

Six-layer flex PCBs push the boundaries of flexible circuit technology, offering the routing density and electrical performance needed for advanced applications in aerospace, medical, and high-performance computing.

With six conductive layers, designers gain maximum flexibility in layer assignment. Multiple signal layers can be sandwiched between ground planes for optimal shielding. Power distribution can be separated from sensitive signal routing. Complex via structures including stacked and staggered microvias enable component placement with the highest pin densities.

Our 6-layer flex service leverages advanced manufacturing processes including sequential lamination, laser drilling, and precision impedance control. We support both all-flex and rigid-flex configurations with the quality certifications needed for aerospace and medical applications.

Key Features

Maximum Routing Density

Six layers provide extensive routing channels. Multiple signal layers with dedicated reference planes enable the highest interconnect density.

Full HDI Capability

Stacked and staggered microvias, via-in-pad, and any-layer interconnects. Full ELIC (Every Layer Interconnect) when required.

Complete Shielding

Signal layers can be fully enclosed between ground planes for maximum EMI protection. Critical for sensitive analog and high-frequency applications.

Power Integrity

Multiple power domains with dedicated plane layers. Low impedance power distribution for high-current and mixed-signal designs.

Technical Specifications

Layer Count6 Layers
MaterialHigh-Performance Polyimide
Copper Weight0.5oz - 2oz
Min. Line Width0.05mm (2 mil)
Min. Line Space0.05mm (2 mil)
Total Thickness0.3mm - 0.8mm
Via TypesPTH, Blind, Buried, Stacked Vias
Impedance Control±10% Standard, ±5% Available
HDI CapabilityFull HDI Support
Lead Time10-15 days (prototype)

Applications for 6-Layer Flex

6-layer flex PCBs serve the most demanding applications in advanced electronics.

Aerospace Electronics

Flight control systems, satellite payloads, and avionics use 6-layer flex for complex signal routing in weight-constrained applications.

Medical Imaging

CT scanners, MRI systems, and ultrasound equipment use 6-layer flex for high-density data acquisition with excellent signal integrity.

High-Performance Computing

Server interconnects and data center equipment benefit from 6-layer flex's ability to route high-speed differential pairs with controlled impedance.

Defense Systems

Radar, electronic warfare, and communication systems use 6-layer flex for reliable performance in harsh environments with complex functionality.

Advanced Consumer Electronics

Flagship smartphones and tablets use 6-layer flex for the highest component density and most compact designs.

6-layer flex PCB applications

Stackup Configurations

6-layer flex stackup design balances electrical requirements with manufacturing constraints.

Symmetric Stackup

Signal-Ground-Signal-Signal-Ground-Signal configurations provide balanced construction for reliable manufacturing. Ideal for most applications.

Asymmetric Options

When specific electrical requirements demand it, asymmetric stackups can be designed with careful attention to manufacturing implications.

Core and Prepreg Selection

Thin cores enable tight total thickness while prepreg layers provide lamination bonds. Material selection impacts both electrical and mechanical properties.

Impedance Planning

Multiple impedance values can be achieved on different layers. We optimize dielectric thicknesses to meet your various impedance requirements.

Flex Region Design

For rigid-flex applications, the flex region may use fewer layers than rigid areas to maintain flexibility. Layer transitions require careful design attention.

HDI Via Structures

6-layer flex fully exploits HDI via technology for maximum density.

Stacked Microvias

Multiple via layers stacked directly over each other enable vertical interconnects through multiple layers. Requires sequential lamination for reliability.

Staggered Microvias

Offset via placement on successive layers. More manufacturable than stacked vias while still enabling high density.

Via-in-Pad

Component pads placed directly over vias with conductive fill. Maximizes component density for fine-pitch packages.

Skip Vias

Blind vias spanning multiple layers. Connect outer layer directly to inner layers without intermediate connection.

Any-Layer Via (ALIVH)

Advanced interconnect technology enabling via connection between any two adjacent layers throughout the stackup. Maximum routing flexibility.

Use Cases

Satellite Transponder Module

Satellite Transponder Module

Space-grade 6-layer flex for satellite communication payload. NASA low-outgassing certified with controlled impedance for Ku-band RF routing.

Medical Imaging Array

Medical Imaging Array

High-density 6-layer flex connecting 256-channel ultrasound transducer array. Fine-pitch routing with excellent crosstalk isolation.

5G Massive MIMO Antenna

5G Massive MIMO Antenna

6-layer flex antenna feed network for 64-element 5G massive MIMO array. Controlled impedance with integrated power distribution.

Why Choose FlexiPCB

Full HDI capability with stacked and staggered microvias
Sequential lamination for complex via structures
AS9100D certification for aerospace applications
Precision impedance control with ±5% tolerance
Expert design support for complex multilayer flex
Proven track record in demanding applications

Frequently Asked Questions

What is the minimum thickness for 6-layer flex?

Minimum total thickness depends on copper weights and dielectric requirements. Typical minimum is around 0.3mm for standard copper weights. We can work with you to minimize thickness for your application.

Can 6-layer flex still bend?

Yes, though with larger bend radius requirements than fewer-layer designs. Typical minimum bend radius is 10x thickness. For rigid-flex, we optimize flex region layer count.

What is the lead time for 6-layer flex prototypes?

Prototype lead time is typically 10-15 business days depending on via structure complexity. Sequential lamination for HDI vias adds processing time.

Do you support stacked microvias in 6-layer flex?

Yes, we support stacked microvia structures with appropriate fill and planarization. Our processes are validated for reliable stacked via interconnects.

What certifications do you have for 6-layer flex?

Our 6-layer flex manufacturing is supported by ISO 9001, and we offer AS9100D certification for aerospace applications and ISO 13485 for medical devices.

Related Solutions

Engineer Your 6-Layer Flex Solution

Advanced applications demand advanced manufacturing. Our engineering team provides comprehensive support for your 6-layer flex PCB project from design through production.