We’ve assembled boards with the MPM3550 which has the square lid with the small hole to indicate the location of pin 1. Once the board was powered and some heat was present, liquid began bubbling out of the pin 1 hole. Although the power supply continued to operate on the protoboards we are concerned that we missed some special assembly note. Once we built a larger number, we have seen a few of the power supplies fail.
I don’t see anything in the data sheet but is there some special process to ensure that the cover doesn’t fill with liquid during the board wash? If it does, are there reliability concerns? Should we be baking the board to eliminate any residual moisture?
Hello bill.taboada,
Thank you for reaching out to the forum.
I do not see any manufacturing note regarding that pin1 hole marker and will get back to you as soon as possible.
Regards,
Vinh Tran
Hello bill.taboada,
Please bake the boards after board wash to remove the residual moisture.
Regards,
Vinh Tran
Hi Vinh Tran,
Thank you for the information. Will you be adding this instruction to the data sheet or to the website for future users? No special assembly instructions currently exist.
Regards, Bill