The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 04, 1989
Filed:
Jun. 29, 1987
Susumu Okikawa, Ohme, JP;
Hiroshi Mikino, Tachikawa, JP;
Hiromichi Suzuki, Tokyo, JP;
Wahei Kitamura, Kodaira, JP;
Daiji Sakamoto, Yonago, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A semiconductor device in which a pellet and external leads are connected by bonding wires made of aluminum containing a predetermined amount of at least one additive element, the bonding wires containing 0.05 to 3.0 weight % of at least one element selected from the group consisting of iron and palladium, or containing 0.05-3.0 weight % of at least one first element selected from the group consisting of nickel, iron and palladium and 0.05-3.0 weight % of at least one second element selected from the group consisting of magnesium, manganese and silicon, whereby the corrosion resistance of the wire is increased and the breaking strength of the wire is enhanced. The bonding wires can be connected to the semiconductor pellet by a ball bond, and it is disclosed that using a ball having a Vickers hardness of 30-50 enables good bonding of the bonding wire to, e.g., an aluminum pad on the semiconductor pellet to be achieved. A ball having such hardness can be provided by using specific aluminum alloy compositions and by a quenching of the ball. The bonding wire has the shape and height of its loop controlled by annealing the bonding wire at a specified temperature before bonding or by employing a specified composition for the material of the bonding wire. The loop shape and bondability of the bonding wire, which can be made of aluminum or an aluminum composition containing, e.g., about 1.5 weight % of magnesium, are controlled into the best states.