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US 5,393,705 AGranted
Molded semiconductor device using intermediate lead pattern on film carrier formed from lattice pattern commonly available for devices and process of fabrication thereof
AssigneeNEC Corporation
InventorKaoru Sonobe
Life of this patent
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Abstract
A molded semiconductor device comprises a semiconductor chip mounted on an island portion, and external leads coupled with ball pumps on the semiconductor chip by means of a conductive leads patterned on a film carrier, and the conductive leads are formed from a conductive lattice pattern on the film carrier available for other molded devices by selectively cutting the conductive lattice pattern with, for example, a laser beam generator, thereby reducing the production cost.
Claims3
A process of fabricating a molded semiconductor device comprising the steps of:
- a) preparing a conductive lattice patterned on a film carrier, a semiconductor chip, and a lead frame having an island portion and external leads;
- b) selectively cutting said conductive lattice so as to form intermediate conductive leads on said film carrier;
- c) coupling said intermediate conductive leads with terminals of said semiconductor chip mounted on said island portion and with said external leads;
- and
- d) molding said semiconductor chip on said island portion and said intermediate conductive leads on said film carrier in molding material, said external leads partially projecting from said molding material.
2 more elements
A process of fabricating a molded semiconductor device comprising the steps of:
- (a) preparing
- a semiconductor chip having an integrated circuit fabricated therein and terminals coupled with said integrated circuit for communicating with an external electric device,
- a lead frame having an island portion for mounting said semiconductor chip and external leads provided around said island portion, and
- a conductive lattice pattern formed on a film carrier;
- b) selectively cutting said conductive lattice pattern so as to form intermediate conductive leads on said film carrier, said intermediate conductive leads being arranged in such a manner as to be aligned with said terminals and said external leads,
- c) connecting said intermediate conductive leads with said terminals and with said external leads, at least some of said intermediate conductive leads being electrically isolated from one another;
- and
- d) sealing said semiconductor chip on said island portion and said intermediate conductive leads on said film carrier in a molding material in such a manner that said external leads at least partially project therefrom.
5 more elements
Dependencies are inferred from the claim text.