In a large area of grounding (electricity), the legs of common components are connected to them, and the treatment of the connecting legs needs to be comprehensively considered. In terms of electrical performance, the pads of the component legs are perfectly connected with the copper surface, but There are some hidden dangers in the solder assembly of components:
1 welding requires a high power heater.
2 is easy to cause a virtual solder joint.
Therefore, taking into account the electrical performance and process needs, making a cross-shaped pad, called heat shield, commonly known as thermal pad (Thermal), so that the possibility of creating a solder joint due to the cross-distribution heat during soldering Sex is greatly reduced. The treatment of the grounding (ground) leg of the multilayer board is the same.