source:Industry News release time:2023-11-01 Article author:yu Popular:pcb
Many people often think that as long as a PCB circuit board has blind holes, it is an HDI board. So, is a PCB board with blind holes an HDI board? Let the Shenzhen PCB manufacturer explain in detail the method for determining blind hole PCB boards. HDI boards are high-density connected circuit boards, and blind hole electroplating and secondary crimping boards are HDI boards, divided into first order, second order, third order, fourth order, and fifth order HDI, such as iPhone
The 6 motherboard is a fifth order HDI. A PCB board with a simple buried hole may not necessarily be HDI.
The first order is relatively simple and the process can be well controlled. When it comes to the second order, it starts to be difficult. The difficulty lies in the issues of the drill bit, the punch, and the copper plating.
There are various second-order designs:
1. The staggered position of each stage requires connecting the secondary layer through wires in the middle layer, which is equivalent to two first-order HDIs in practice.
2. Two first order holes overlap, which is achieved by covering the second order, and the processing is similar to two first order holes, but there are many processing points that need special control.
3. Drilling directly from the outer layer to the third layer (or N-2) is a very different process from the front, making drilling more difficult.
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