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:

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

Witgain Technology Limited was established in 2007. Factories locate in HuiZhou City and marketing locates in ShenZhen City. The total area of two factories is around 10000 square meters. We can offer 2-layer and multi-layer pcb services to our customers, highest to 24 layers and rigid-flex pcb, ceramic pcb, HDI pcb, heavy copper pcb are also included. To meet our customer's diversified demands, we also accept prototype orders, small batch orders and big batch orders. Quality and technology is what we value most and we will never stop improving our capabilities. Our customers' satisfaction is always what we are seeking for.