Nippon Steel Corporation

Masashi Konda

Kohei Tatsumi

Toshio Yamamoto

Yoji Kawakami

Hiroshi Hoshiba

Naoharu Ohikata

Tomohiro Uno

Hiroaki Otsuka

Yasuhide Ohno

Yasuhiro Suzuki

Tadakatsu Maruyama

Tadashi Kamiyama

Tosiharu Kikuchi

Yoshiaki Emoto

A process of forming ball bumps for electrical connection to an integrated circuit, the process comprising the steps of: applying a vibration at a small amplitude to a vessel containing small balls of an electroconductive material to cause the small balls to jump up above the vessel; holding and arranging the small balls on an arrangement baseplate by attracting the jumping up small balls to attraction openings provided in the arrangement baseplate in positions corresponding to positions of at least one set of the electrode pads of one semiconductor chip; removing excess small balls adhered either to the arrangement baseplate or to the small balls attracted to the openings; and simultaneously bonding the small balls held and arranged on the arrangement baseplate to bonding spots arranged in positions corresponding to said positions of said at least one set of the electrode pads.

Process and apparatus for forming ball bumps

A semiconductor device is disclosed in which connection between electrodes of a semiconductor element and/or between a plurality of semiconductor elements can be made in one package to the utmost. More particularly, electrodes of two IC chips 12a and 12b are bonded to leader leads 16a and interconnection leads 16b.sub.5 patterned on a film. Connections of the interconnection leads 16b.sub.1 and 16b.sub.2 to 16b.sub.4 and 16b.sub.3 which are impossible by the leads, are made in such a manner that pads 24b.sub.1, 24b.sub.4 and 24b.sub.2, 24b.sub.3 formed on the interconnection leads are connected correspondingly by using bonding wires as jumping wires. After the connection, the IC chips, the leads and the bonding wires are resin-sealed over an overall region encompassed by a region 27.

Semiconductor device with jumping wire

A radiator for a semiconductor chip is provided which is made from a material having good heat conductivity. The radiator is plate shaped and is attached to the semiconductor chip. The radiator has at least one projection on the outer peripheral edge thereof so as to extend outwardly, laterally beyond the outer periphery of the semiconductor chip. The semiconductor chip and the radiator are sealed within plastic so that the projection of the radiator extend outwardly from the plastic encapsulation. Heat from the semiconductor chip is released from the plastic encapsulation via the projection(s) of the radiator. The radiator can be formed from a material which also has good electrical conductivity to electrically protect the semiconductor chip.

Radiator for semiconductor chip

A lead structure for packaging a semiconductor chip is provided which includes a plurality of electroconductive leads. At least one lead of an adjacent pair of electroconductive leads has at least one projecting portion which projects towards the other lead of the pair so that a tortuous path is defined between the electroconductive leads. The tortuous path minimizes outflow of molten plastic between the electroconductive leads.

Lead structure for packaging semiconductor chip

A method of bonding bumps to leads of a TAB tape comprises the steps of preparing a substrate which is provided with through-holes, each having a size which will not allow the bumps to pass therethrough, at positions corresponding to bonding positions of the leads of the TAB tape where the bumps are to be bonded; provisionally arranging the bumps at positions of the through-holes at one side of the substrate by reducing a pressure in another side of the substrate opposite to said one side thereof to such the bumps in said through-holes; disposing the substrate on which the bumps are provisionally arranged and said TAB tape in such a positional relationship that said bumps face to the bonding positions of the leads of said TAB tape; and bonding the provisionally arranged bumps to the leads at the bonding positions and an apparatus for arranging bumps in a positional relationship corresponding to bonding positions of leads of a TAB tape.

Method of bonding bumps to leads of tab tape and an apparatus for

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Tokyo, Japan

Masashi Konda