PCB Prototype - JLCPCB

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It is the copper thickness on the substrate, basically, there are 1 oz and 2 oz available for outer layer.

For the inner layer, the copper weight is 0.5 oz by default. 1oz and 2oz inner copper weight is only available for 4 layer boards, besides, 2 oz inner copper weight is only available for 1.6mm with JLC3313 stackup and 2oz outer copper weight.

Here is an example of it.

Notes:

1. For 1 oz board, please make sure the trace width/space is larger than 5mil for 2 layer board, and 3.5mil for 4/6 layer board.

2. For 2 oz board, please make sure the trace width/space of larger than 8mil for 2/4/6 layer board.

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