Sgs-thomson Microelectronics S.r.l.

Sgsates Componenti Elettronici S.p.a.

Sgs-microelectronics S.r.l.

Giuseppe Marchisi

Paolo Casati

Carlo C De Martiis

Marziano Corno

Pierangelo Magni

Carlo Cognetti

Carlo Cognetti De Martiis

Pieramedeo Bozzini

Mario Scavino

A structure is disclosed which comprises a metal plate, a chip of a semiconductor material attached to the plate, terminal leads, interconnection wires between the leads and the metallized regions of the chip, and a polymer body encapsulating all this with the exception of a surface of the plate and part of the leads. To achieve improved bond between the polymer and the metal, predetermined areas of the plate and the leads have a higher roughness than 1 (R.sub.a .gtoreq.1 .mu.m).

Semiconductor device package with metal-polymer joint of controlled

A process for making an electronic device structure which comprises a metal plate, a semiconductor material chip attached to the plate, terminal leads, interconnection wires between the leads and metallized regions of the chip, and a plastic body which encapsulates the whole with the exception of a surface of the plate and part of the leads. This structure has means of electrical connection between at least one metallized region and the metal plate which comprise at least one metal beam resting onto the plate and being attached thereto by studs integral with the plate, and at least one wire welded between a metallized region of the chip and the metal beam between the studs. At least a portion of the beam and its connection wire are encapsulated within the plastics body.

Method for fabricating an electronic device structure with studs

A control interface device for an electric motor, particularly an electric motor for operating servomechanisms on a vehicle, which includes a conductor frame, an active integrated component mounted on the conductor frame, and a plurality of electric connectors. A single insulating, one-piece enclosing body contains the conductor frame with the active integrated component and the electric connectors included to the conductor frame. Thus, all of the elements required for powering and controlling the motor are gathered inside a single enclosing body which is convenient to handle and connect.

Control interface device for an electric motor

A combination of an electronic semiconductor device comprising a metal plate and a plastics body which encapsulates the metal plate leaving at least a major surface thereof exposed, a heat sink, and means of fastening the heat sink to the device. To enable securement of the heat sink on the device without any external fastening arrangement having to be used, and without unduly straining the solder spot of the device pins to a printed circuit, the device is provided with undercut regions on opposite sides adjacent to the exposed surface of the plate for releasable engagement by the fastening means.

Combination and method for coupling a heat sink to a semiconductor device

A die-stamped frame is fastened to a heat sink metal baseplate by wedging flexible tabs into receiving indentations of the baseplate while keeping the frame substantially in contact with the surface of the baseplate. The wire welding operations may then take place on the end of the fingers of the patterned metal frame while the same are solidly resting on the surface of the baseplate thus facilitating the welding. The backing-off of the metal frame from the surface of the heat sink baseplate takes place upon the closing of the mold used for encapsulating in resin the device. The injection of the resin and its solidification 'freezes' the pins in the backed-off position imposed by the mold upon closing, thus ensuring the electrical isolation between the pins and the integral heat sink baseplate.

Apparatus for assembling and resin-encapsulating a heat sink-mounted

An electronic device structure which comprises a metal plate, a semiconductor material chip attached to the plate, terminal leads, interconnection wires between the leads and metallized regions of the chip, and a plastic body which encapsulates the whole with the exception of a surface of the plate and part of the leads. This structure has highly reliable means of electrical connection between at least one metallized region and the metal plate which comprise at least one metal beam resting onto the plate and being attached thereto by studs integral with the plate, and at least one wire welded between a metallized region of the chip and the metal beam between the studs. At least a portion of the beam and its connection wire are encapsulated within the plastics body.

Electronic device structure with studs locating lead frame on backing

Process and apparatus for assembling and resin-encapsulating a heat

An improved leadframe for packages of integrated power devices which, by virtue of its configuration, allows to press the dissipator on the bottom of the shell during the molding of the plastic case, without the dissipator having exposed portions of its inner face (which is in contact with the chip). In order to achieve this, the leadframe according to the invention comprises a monolithic body which defines a perimetric frame, the leads and the dissipator. The dissipator extends in a depressed plane with respect to the frame and is connected to the frame and to the leads in at least three step-like points which are mutually spaced and non-aligned. During the molding of the plastic case, a pressure is exerted on the frame and is transmitted to the dissipator by the three step-like points, so that the dissipator is effectively pressed flat against the bottom of the mold without using pushers which pass through the plastic case.

Leadframe with heat dissipator connected to S-shaped fingers

Two superimposed series of electric contacts in the shape of metal-sheet strips, electrically connected to a metallic place which supports a semiconductor chip, are electrically separated but mechanically connected by an interposed layer of adhesive material at high insulation. The whole is completely inserted in a covering of insulating material, which forms a flat support, from which, at opposite faces, only limited adjacent contact portions of said electric contacts emerge. The place and at least one of the two series of contacts make part of a single starting metallic frame, on which the other series of contacts is superimposed. This latter in its turn can make part of the same metallic frame and to be superimposed by refolding or can be prepared separately and then applied on the first series.

Method for manufacturing a semiconductor card with electrical contacts

A hollow-type package of optically and non-optically active semiconductor devices is entirely made of moldable plastic material by utilizing a preformed box-like shell of a rigid plastic material for enclosing the semiconductor dye and the electrical connection wires before molding the shell in an epoxy resin. The protective shell is composed of two corresponding half parts and, in the case of optically active devices, the top half of the shell is provided with a window closed by a transparent pane which is sealed during the encapsulation. Preferably, the two halves of the protection shell have two spaced lateral walls forming two spaced sealing perimeters and a perimetral chamber which is formed therebetween and surrounds a central cavity of the shell for accommodating any encapsulating resin which may eventually enter through the outer sealing perimeter during molding. The central cavity of the shell may be filled with a nonrigid silicon resin before molding for further increasing the protection. The entirely plastic hollow package may be formed through a normal plastic molding process.

Hollow plastic package for semiconductor devices

A semiconductor device in a plastic or ceramic package contains at least one silicon die on each side of a central die pad of a single metal frame, thus allowing a substantial space saving on the printed circuit assembly card. The bonding of the silicon dies and the soldering of the connecting wires are performed on both sides of the frame by emplying a special slotted clamp fixture inside which a strip of frames is clamped during these assembly operations and relative quality control operations.

Semiconductor device package with dies mounted on both sides of the

Two superimposed series of electric contacts in the shape of metal-sheet strips, electrically connected to a metallic plate which supports a semiconductor chip, are electrically separated but mechanically connected by an interposed layer of insulating adhesive material. The whole is completely inserted in a covering of insulating material, which forms a flat support, from which, at opposite faces, only limited ajdacent contact portions of the electric contacts emerge. The place and at least one of the two series of contacts are part of a single starting metallic frame, on which the second series of contacts is superimposed. The latter series of contacts can be part of the same metallic frame as the first series in which case the device is formed by a folding operation. Alternatively the second series can be prepared separately and then applied on the first series.

Semiconductor card with electrical contacts on both faces

Method for making an insulating package premolded on a metallic frame with electrical contacts containing in an inner space a semiconductor chip which rests on a thermic dissipator and is connected to the electrical contacts. The inner space of the package is closed on top by a cover provided with a lateral extension with a bent end, which operates not only as a cover, but also as a means for fastening and thrusting the package toward a support surface.

Process for making single-in-line integrated electronic component

An insulating package premolded on a metallic frame with electrical contacts contains in an inner space a semiconductor chip which rests on a thermic dissipator and is connected to the electrical contacts. The inner space of the package is closed on top by a cover provided with a lateral extension with a bent end, which operates not only as a cover, but also as a means for fastening and thrusting the package toward a support surface.

Growing community of inventors

Milan, Italy

Giuseppe Marchisi