Witgain Technology Limited
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4 Layer PCB Half Hole HDI PCB Blind And Buried Holes
Board Info:
1 Part NO: Half hole PCB0007
2 Layer Count: 4 Layer PCB
3 Finished Board Thickness: 0.8 MM tolerance is +/-0.1MM
4 Solder Mask: Green
5 Min Lind Space&Width: 2.5/2.5 mil
6 Application Area: Blue-tooth Module
7 Drilling: L1-L2 0.1MM, L1-L4 0.2MM
8 Drawing Size: 119mm*69.5mm/20pcs
Our Capabilities:
| NO | Item | Capability |
| 1 | Layer Count | 1-24 Layers |
| 2 | Board Thickness | 0.1mm-6.0mm |
| 3 | Finished Board Max Size | 700mm*800mm |
| 4 | Finished Board Thickness Tolerance | +/-10% +/-0.1(<1.0mm) |
| 5 | Warp | <0.7% |
| 6 | Major CCL Brand | KB/NanYa/ITEQ/ShengYi/Rogers Etc |
| 7 | Material Type | FR4,CEM-1,CEM-3,Aluminum,Copper, Ceramic, PI, PET |
| 8 | Drill Hole Diameter | 0.1mm-6.5mm |
| 9 | Out Layer Copper Thickness | 1/2OZ-8OZ |
| 10 | Inner Layer Copper Thickness | 1/3OZ-6OZ |
| 11 | Aspect Ratio | 10:1 |
| 12 | PTH Hole Tolerance | +/-3mil |
| 13 | NPTH Hole Tolerance | +/-1mil |
| 14 | Copper Thickness of PTH Wall | >10mil(25um) |
| 15 | Line Width And Space | 2/2mil |
| 16 | Min Solder Mask Bridge | 2.5mil |
| 17 | Solder Mask Alignment Tolerance | +/-2mil |
| 18 | Dimension Tolerance | +/-4mil |
| 19 | Max Gold Thickness | 200u'(0.2mil) |
| 20 | Thermal Shock | 288℃, 10s, 3 times |
| 21 | Impedance Control | +/-10% |
| 22 | Test Capability | PAD Size min 0.1mm |
| 23 | Min BGA | 7mil |
| 24 | Surface Treatment | OSP, ENIG,HASL, Plating Gold, Carbon Oil,Peelable Mask etc |
FAQ:
Q1: What is an Annular Ring?
A1: A via is created by drilling a hole through a copper pad etched on each layer of a PCB. An Annular Ring is the area between the edge of the drilled via and the copper pad associated with that hole. The greater the width of an annular ring, the greater the copper connection around the drilled via will be.
In a multilayer PCB, traces are routed from one layer to another layer with the help of vias. These vias are the holes drilled through copper pads on the surface of the PCB. The amount of copper left around the via on both top and bottom sides of the PCB is called the annular ring.
Mathematically, an annular ring is the difference between the diameter of the hole and diameter of the pad divided by 2. For instance, if the diameter of the pad is 24 mils and the diameter of the hole is 12 mils then the width of the annular ring is [(24-12)/2] = 6 mils