Multi-chip upright tile sandwich package structure and technique therefor
A technology of laying sandwich cores and packaging structures, which is applied in the manufacture of electrical components, electrical solid devices, semiconductor/solid devices, etc. It can solve problems such as welding dumping, low manufacturing efficiency, and poor welding, so as to reduce packaging resistance and improve production efficiency. Improve and reduce the effect of interconnection process
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[0079] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0080] As shown in Fig. 8(a) to Fig. 8(n), a process method of a multi-chip front-mounted tiled sandwich packaging structure in this embodiment, the specific process steps are as follows:
[0081] Step 1, see Figure 8 (a), provide the first lead frame, the material of the first lead frame is alloy copper material, pure copper material, aluminum copper plated material, zinc plated copper material, nickel-iron alloy material, or other CTE The range is 8*10^-6 / ℃~25*10^-6 / ℃ conductive material;
[0082] Step 2, see Figure 8(b), apply solder paste on the base island area of the first lead frame by screen printing, the purpose is to realize the bonding with the base island after the first chip is implanted. Thickness and opening area can precisely control the thickness, area and position of solder paste;
[0083] Step 3, referring to FIG. 8(c), ...
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