Pcb Component Placement Rules

Die-cast optical module placement method

Through-hole technology (THT) and surface-mount technology (SMT) are the two most common mounting methods. In THT, metal leads of each component are threaded through holes in the circuit board and soldered into place. After preparing semiconductor wafers and creating individual dies, the die attach process involves placing a semiconductor die onto a substrate or package. Die placement accuracy of ±5 microns and better has been demonstrated. Factors that enable high accuracy die bonding range from machine platform design to a combination of process. A wide variety of die assembly methods and materials are available for implementation into high yield, high reliability systems. Some of the options for COB die attach are reviewed here for comparison. Focus on controlling the dimensional accuracy of key mating interfaces and the flatness of contact surfaces, and structurally ensure the connection stability of optical modules during high-speed transmission and repeated insertion cycles.

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