I am designing my PCB with BGAs; what can I do the improve its manufacturability?
A. BGAs are becoming increasingly popular. If your PCB design is not yet frozen, there is one simple but very useful thing you can do to improve the manufacturability of the board. If you look at the photo below, you will note the presence of chevron shaped corner indicators in the top copper layer of the PCB. These enable us to align the package corners before reflow and to check for correct positioning after reflow. This layout has two sets of markers to allow for two different package sizes, most people only need one set to define the corners of the package they are using. You can use a circular pad rather than a chevron if tight for room and ideally on every corner if you can. The markers MUST be in the top copper layer – do not try to do it with silkscreen as the registration is too poor to be any use on a BGA.
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