Lead frame structure
AssigneeWalsin Advanced Electronics LTD
InventorsWen-Chun Liu, Hui-Ping Liu, Jung-Jie Liou, Yi-Hsiang Pan, Sheng-Tung Tsai
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Abstract
A lead frame for a semiconductor package. The lead frame includes a die pad and a plurality of leads. One surface of the die pad supports a silicon chip while the other surface has a plurality of annular grooves all having the same geometric center. The inner lead portion of the leads surrounds the die pad, but the die pad and the leads are on different planar surfaces.
Claims11
A lead frame for a chip package, comprising:
- a die pad having a first surface and a second surface, wherein the first surface supports a silicon chip while the second surface has a plurality of concentric grooves having a same geometric center;
- and
- a plurality of leads, wherein each lead can be divided into an inner lead portion and an outer lead portion such that the inner lead portion of the leads surrounds the die pad.
A semiconductor package, comprising:
- a silicon chip;
- a die pad having a first surface and a second surface, wherein the first surface supports the silicon chip while the second surface has a plurality of grooves having a same geometric center;
- and
- a plurality of leads surrounding the die pad, wherein each lead can be divided into an inner lead portion and an outer lead portion;
- a plurality of conductive wires for electrical connection of the silicon chip and the leads;
- and
- an insulation material for enclosing the silicon chip, the inner lead portion of the leads, the conductive wires and a portion of the die pad such that the second surface of the die pad and the outer lead portion of the leads are exposed.
A lead frame used for a chip package in which a molding material enclosing a first surface of a die pad and leaving a second surface opposite to the first surface of the die pad exposed, the lead frame comprising:
- the die pad, comprising at least a groove on the second surface to avoid the molding material spreading over the second surface;
- and
- a plurality of leads, surrounding the die pad and electrically connecting a chip disposed on the first surface of the die pad via a plurality of wires.
Dependencies are inferred from the claim text.