Advanced Member level 3
I want to buy HD video camera modules PCB. I got one sample and was very surprised that all ICs including FPGA, DSP and even power supply are engraved very precisely with some laser technology, and under magnifying glass ICs surface now have equally spaced melted plastic dots. I am sure that main purpose was to make IC component names totally unreadable to make reverse-engeneering much harder. What i am concerned of is reliability of ICs after such engraving. Silicon inside IC is usually very small and placed in the center of the entire chip. What if laser beam goes through plastic and cause photoelectric effect in some places with current enough to damage or degrade silicon circuit? I read story about some power supply IC noise that was affected by camera flashes, which is light source too. Although IC plastic is black, high intensity light can go through it and couse ome photoelectric effect. Please comment.