Polyimide ENIG Rigid Flex PCB Fabrication 4 Layer Circuit Board For Medical Device

4 Layer PCB Flexible Board for Medical Device

♦ What is 4 Layer PCB?

A ​​4-layer PCB​​ is a printed circuit board with ​​four conductive copper layers​​ stacked together with insulating (dielectric) material in between. These layers are interconnected through ​​vias​​ (plated holes) to create complex circuits while saving space and improving performance compared to single or double-sided boards.

♦ Structure of a 4-Layer PCB​

A typical 4-layer stackup consists of:

1. 1. ​​Top Layer (Signal Layer)​​ – Contains component placements and high-speed signal traces.
   2. ​​Inner Layer 1 (Ground Plane)​​ – Acts as a reference plane for EMI shielding and noise reduction.
   3. ​​Inner Layer 2 (Power Plane)​​ – Distributes stable power supply to components.
   4. ​​Bottom Layer (Signal Layer)​​ – Additional routing space for signals and components.

♦ ​​4-Layer PCB vs. 2-Layer PCB​​

♦ ​​Manufacturing Process​​

1. 1. ​​Design​​ – Use CAD tools (Altium, KiCad) to define layer stackup and routing.
   2. ​​Material Selection​​ – Choose core/prepreg materials (FR-4, Rogers).
   3. ​​Lamination​​ – Bond layers under heat/pressure.
   4. ​​Drilling & Plating​​ – Create vias for inter-layer connections.
   5. ​​Etching​​ – Remove excess copper to form traces.
   6. ​​Testing​​ – Verify continuity, impedance, and shorts.

♦ Technical Parameters

♦ One-Stop PCBs Solution

PCB Prototype	Felx PCB	Rigid-Flex PCB	Ceramic PCB
Heavy Copper PCB	HDI PCB	High Frequency PCB	High TG PCB

♦ Advantages of DQS Team

1. On-time Delivery:

• • Owned PCBA factories 15,000 ㎡
  • 13 fully automatic SMT lines
  • 4 DIP assembly lines

2. Quality Guaranteed:

• • IATF, ISO, IPC, UL standards
  • Online SPI, AOI, X-Ray Inspection
  • The qualified rate of products reach 99.9%

3. Premium Service:

• • 24H reply your inquiry
  • Perfect after-sales service system
  • From prototype to mass production

DQS Electronic is located in Shenzhen, focusing on PCB Layout Design, PCB Fabrication, Electronic Components Sourcing, SMT, PCB Assembly and Testing. We are a one-stop EMS electronic manufacturing company committed to providing global customers with rapid prototyping and mass production.

Our products include single, double, multi, high frequency, aluminum base, copper base, FR-4 and other high precision circuit boards.

We have over 10 years of experience in serving many domestic and foreign brand customers in a wide range of fields such as Medical, Automotive, Industrial Automation, Artificial Intelligence, Smart Home, Security, Power and Communications, etc..