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What is PCB resin plug hole? Why use resin plug hole?

Release time:

2023-02-10 09:14

PCB uses resin plug holes. This process is usually due to BGA parts, because traditional BGA may make VIA to the back between PAD and PAD for wiring, but if BGA is too dense and the VIA cannot go out, it can be drilled directly from PAD to make via to other layers for wiring, and then the hole is filled with resin and copper plated to become PAD. That is, the commonly known VIP process (via in pad), if it is only done on the PAD via without resin plug hole, it is easy to cause tin leakage leading to short circuit on the back and front air welding.

The manufacturing process of PCB resin hole includes drilling, electroplating, plugging, baking and grinding. After drilling, the hole will be plated through, and then the resin will be plugged and baked. Finally, it will be ground flat. Then the other holes are drilled and the normal process is followed.

If the plug hole is not plugged, when there are bubbles in the hole, because the bubbles are easy to absorb moisture, the board may explode when the tin furnace, but in the process of the plug hole if there are bubbles in the hole, when baking bubbles will extrude the resin, causing a depression and a prominent situation, at this time you can detect defective products, and there are bubbles on the board is not likely to explode, because the main cause of the explosion is moisture, So if the board is just out of the factory or the board is baked on the piece, generally speaking, it will not cause the explosion of the board.