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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:
♦ 4-Layer PCB vs. 2-Layer PCB
♦ Manufacturing Process
♦ Technical Parameters
Item |
Spec |
Layers |
1~64 |
Board Thickness |
0.1mm-10 mm |
Material |
FR-4, CEM-1/CEM-3, PI, High Tg, Rogers, PTEF, Alu/Cu Base,Ceramic, etc |
Max Panel Size |
800mm×1200mm |
Min Hole Size |
0.075mm |
Min Line Width/Space |
Standard: 3mil(0.075mm) Advance: 2mil |
Board Outline Tolerance |
士0.10mm |
Insulation Layer Thickness |
0.075mm--5.00mm |
Out Layer Copper Thickness |
18um--350um |
Drilling Hole (Mechanical) |
17um--175um |
Finish Hole (Mechanical) |
17um--175um |
Diameter Tolerance (Mechanical) |
0.05mm |
Registration (Mechanical) |
0.075mm |
Aspect Ratio |
17:01 |
Solder Mask Type |
LPI |
SMT Min. Solder Mask Width |
0.075mm |
Min. Solder Mask Clearance |
0.05mm |
Plug Hole Diameter |
0.25mm--0.60mm |