Patent ID: 6555899
Filing Date: 2003-04-29
Classification: H01L

Abstract:
A leadframe assembly for a semiconductor package, said leadframe comprising:a plate-type frame body; a plurality of tie bars extending inwardly from said plate-type frame body to a central portion of said leadframe; a chip paddle connected to said plurality of tie bars, said chip paddle having a plurality of sides and corners and having an area adapted to receive a semiconductor chip thereupon; each of the plurality of tie bars being constructed with a reverse-down set portion adjacent said chip paddle and outside of a perimeter of the chip paddle; and a plurality of internal leads formed integral with said plate-type frame body and radially disposed at regular intervals along the perimeter of said chip paddle; and encapsulation material encapsulating the plate-type frame body and a semiconductor chip coupled to the chip paddle, wherein a lower surface of the tie bars are externally exposed; wherein the reverse-down set portion reduces an area of the externally exposed portion of the respective tie bar.