The invention discloses a self-alignment integrated
package method of a high-density three-dimensional lamination layer, and aims to provides an integrated
package method which employs a BGA
welding ball as an interlayer mechanical support for multi-layer substrate self-alignment three-dimensional stack and also can be a
signal interconnection passage among high-density
layers. The self-alignmentintegrated
package method is implemented according to the technical scheme that bonding pads are arranged on a lower surface of a top-layer substrate, an upper surface and a lower surface of an intermediate-layer substrate and an upper surface of a bottom-layer substrate and are used for
welding micro BGA
welding balls, the micro BGA welding balls are attached onto the upper surface of the intermediate-layer substrate and the upper surface of the bottom-layer substrate, the micro BGA welding balls on the upper surface of the intermediate-layer substrate are corresponding to the lower surface of the top-layer substrate, the micro BGA welding balls on the upper surface of the bottom-layer substrate are corresponding to the lower surface of the intermediate-layer substrate, vertical and
interconnection rectangular array micro BGA ball welding is formed, a hollow square boss cavity box body is arranged at the peripheries outside an upper cavity surface of the intermediate-layer substrate 2and an upper cavity surface of the bottom-layer substrate 3, the cavity box body is stacked and placed in a
backflow welding furnace by a tool, and self-alignment lamination layer welding is performed to form a package body.