Patent ID: 9087828
Filing Date: 2015-07-21
Classification: H01L

Abstract:
1. A preparation method of a semiconductor device with a thick bottom metal comprises the following steps: providing a lead frame including a plurality of die paddles, wherein the adjacent die paddles are connected to each other by one or more connecting parts, each connecting part comprises a support part arranged at a back surface of the connecting part and extending along a direction away from the back surface, wherein bottom surfaces of all support parts are substantially coplanar; mounting a semiconductor chip covered with a top plastic package layer at a front chip surface and a back metal layer at a back chip surface opposite to the front chip surface on a front paddle surface of each die paddle, wherein the back metal layer is directly attached onto the front paddle surface of the die paddle; forming a plastic package body with a plastic package material covering the die paddles, the connecting part and the semiconductor chip with the top plastic package layer and the back metal layer, wherein an upper surface of the top plastic package layer and the bottom surfaces of the support part are exposed from the plastic package body; and cutting off a portion of the plastic package body and connecting parts between the adjacent die paddles to separate individual semiconductor devices each includes a semiconductor chip with the top plastic package layer and the back metal layer, wherein a thickness of the die paddle is less than a distance between the bottom surface of the support part and the front surface of the die paddle such that the back surface of the die paddle is covered with a bottom plastic package layer formed by cutting the plastic package body covering the back surface of the die paddle.