Printed circuit board assembly

Components on a PCB are connected electronically to the designed circuits by two different methods. The first method is called "Through Hole Technology" and the second and newest method is called "Surface Mount Technology" Through Hole Technology requires a component that has thin wires, or leads, which are pushed through small holes in the substrate and soldered to connection pads in the circuits on the other side of the board. The contact with the holes and pull of gravity between the leads and the sides of the holes enables the components to stay in place until they are soldered. Surface Mount Technology has stubby J-shaped or L-shaped legs on each component keeping contact with the printed circuits directly.

A solder paste consisting of glue, flux, and solder are then applied at this point of contact to allow the components to be held in place until the actual solder is melted or "reflowed," in an special oven to make the final connection complete. Although surface mount technology requires greater attention and care in the placement of the components, its benefits are that it eliminates the time-consuming drilling process as well as the space-consuming connection pads characteristic with Through Hole Technology. In today’s manufacturing, both technologies are frequently used.

Wonderful PCB limited is a professional PCB manufacture, but we also experience in PCB assembly,for THT manufacture, we using semi-automatic and automatic insertion equipment and ensuring proper tape and reel component purchasing, we deliver timely and low-cost solutions. PCB assembly depot offers both automated and hand assembling of through hole components. Our assembly lines support both simple and complex board assemblies. For assemblies like nuts/bolts, riveting and studs, that require manual/mechanical assembly, we have a team of highly trained, qualified and experienced assemblers. We have advanced equipment for SMD from screen printers to smt placement machines to reflow ovens.