18 layer 3step HDI PCB refers to the HDI circuit board with more than 2 levels, usually 3 + N + 3 or 4 + N + 4 or 5 + N + 5 structure. The blind hole uses a laser, and the hole copper is about 15UM.The following is about 18 layer 3step HDI circuit board related, I hope to help you better understand 18 layer 3step HDI circuit board.
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