Dense-pitch small-pad copper wire bonded double IC chip stack packaging piece and preparation method therefor

A dense-pitch small-pad copper wire bonded double IC chip stack package, comprising:

• a plastic package body, wherein a lead frame carrier and a frame lead inner pin are arranged in the plastic package body, an upper surface of the lead frame carrier is fixedly connected with a first IC chip;
• a second IC chip is stacked on the first IC chip, wherein an upper surface of the first IC chip is provided with a plurality of pads, and an upper surface of the second IC chip is provided with a plurality of pads, the plurality of pads on the upper surface of the first IC chip and the plurality of pads on the upper surface of the second IC chip are arranged as two lines of pad groups in parallel, the two pad groups are respectively a first pad group and a second pad group;
• a metal ball is implanted on each pad, each implanted metal ball is connected with a first copper bonding ball, and a third copper bonding wire is formed by arching on a corresponding implanted metal ball between the second IC chip and the first IC chip;
• wherein metal balls are welded on every other pads of the first and second pad groups;
• the pads with welded metal balls in the first pad group correspond to the pads without welded metal balls in the second pad group, a first copper bonding ball is welded on each welded metal ball in each pad group, and a second bonding ball is welded on each pad without a welded metal ball in each pad group, and a copper bonding spot is punched on the corresponding frame lead inner pin to form a second copper bonding wire.