Patent ID: 9646920
Date: 2017-05-09
CPC Classifications: H01L

Claim:
1. A preparation method of a power semiconductor device, the preparation method comprising: providing a first lead frame with a plurality of die paddles; attaching a respective first semiconductor chip to a front side of each die paddle; flipping the first lead frame with the respective first semiconductor chip attached to said each die paddle and then attaching a respective second semiconductor chip to a back side of said each die paddle; providing a second lead frame with a first plurality of conductive pads to mount on the plurality of first semiconductor chips, wherein a respective conductive pad of the first plurality of conductive pads is attached to an electrode on a top surface of each first semiconductor chip; providing a third lead frame with a second plurality of conductive pads to mount on the plurality of second semiconductor chips, wherein a respective conductive pad of the second plurality of conductive pads is attached to an electrode on a top surface of each second semiconductor chip; forming a plastic package layer covering the first lead frame, the second lead frame, the third lead frame, the plurality of first semiconductor chips and the plurality of second semiconductor chips so as to form a lamination; and cutting the lamination along cutting lines between adjacent die paddles, wherein each plastic package body of a plurality of plastic package bodies, formed by cutting the plastic package layer, covers a respective die paddle, a respective first semiconductor chip, a respective second semiconductor chip, one or more conductive pads of the first plurality of conductive pads and one or more conductive pads of the second plurality of conductive pads, wherein a side surface of each conductive pad of the first and second pluralities of conductive pads is exposed from a respective cutting side surface of the plurality of plastic package bodies; wherein a respective side surface of the conductive pad of the first plurality of conductive pads, the respective cutting side surface of the plurality of plastic package bodies and a side surface of each conductive pad of the second plurality of conductive pads are located in a co-plane and wherein a respective side surface of the conductive pad of the first plurality of conductive pads, a respective side surface of the conductive pad of the second plurality of conductive pads and a side surface of each die paddle of the plurality of die paddles are located in a co-plane.