Uniform plating in Heavy Copper PCB

Recently, KnownPCB have completed a project of 6-layer heavy copper PCB with multiple types of plated through-hole structures. The through-hole structure on this multilayer heavy copper board is the key feature of the interlayer connection and high-current conduction.

What are the advantages of this Heavy Copper PCB? 

While ensuring optimal thermal management of this kind of heavy copper board, we using our uniform through-hole plating process to achieve robust through-hole plating quality which complies with IPC Class 3, and further more improve interconnection reliability and mechanical stability of this multilayer heavy copper PCB under high current load conditions.

Technical parameters of the heavy copper PCB：

Why does the reliability of Heavy Copper PCBs often depend on the quality of through-hole plating?

In this type of heavy copper PCB manufacturing, the reliability of plated through holes is critical, and it is determined by the uniformity of through-hole copper plating.

Risk of Manufacturing at the heavy copper PCB：

If the copper thickness of the hole wall is non-uniform, it will easily increase the electrical resistance and local temperature inside the board, and lead to failures such as barrel cracking or corner fractures under thermal cycling conditions, thereby affecting the stability and long-term reliability of high-current transmission.

Since the risks are coming from non-uniform hole wall copper thickness, thus, the critical goal in manufacturing control of multilayer heavy copper PCB is to enhance plating uniformity and coverage.

Therefore, KnownPCB address this heavy copper board manufacturing challenge in through-hole plating:

The manufacturing solution for the heavy copper PCB:

We used high-coverage electroplating process, and with optimized current distribution and accurate process control to achieve consistent hole-wall copper thickness. This measure ensures the thick copper board can still maintain robust interconnection reliability under high-current loading and repeated thermal cycling.

Since 2008, KnownPCB has focused on multilayer heavy copper PCB fabrication with large-diameter through holes. We have continuously gathered fully experiences in thick heavy copper board production processing, uniform through-hold plating, and thermal management.

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