Heat dissipation and welding offset prevention packaging structure of PCB and design method of heat dissipation and welding offset prevention packaging structure
A technology of packaging structure and design method, which is applied in the direction of electrical connection of printed components, printed circuits connected with non-printed electrical components, printed circuit components, etc., can solve problems such as device welding offset, reduce workload, realize Resource migration and sharing, solving the effect of performance degradation
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[0042] Example 1:
[0043] This embodiment takes the SOT-404 package as an example to illustrate the design method of the package structure of the heat dissipation of the PCB and the anti-soldering offset of the present invention, including the following steps:
[0044] S1: Conventional package design: Create a new SOT-404 package using the conventional package design method.
[0045] S2: Heat dissipation pad design: see figure 2 , image 3 and Figure 4 , select the "Top Layer" layer, and evenly place 5×5 circular pads with an aperture of 0.3mm in an array on the large heat dissipation pad of the SOT-404 package, as the heat dissipation hole of the device, and make a "plug" during PCB processing Hole" requirements to prevent solder paste from leaking to the bottom layer. Among them, the arrangement of cooling holes "N×M" can be determined according to the specific size of the heat dissipation pad. The spacing L1 between the holes and the distance L2 between the holes and...
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