Abstract:
A semiconductor chip assembly includes a semiconductor chip attached to a support circuit. The chip includes a conductive pad and the support circuit includes a conductive trace. An elongated wire that electrically connects the pad to the trace is attached to the pad by a wire bond and attached to the trace by a plated connection joint. Preferably, an electrically conductive path between and in contact with the pad and the trace includes the elongated wire and excludes solder and conductive adhesive. A method of manufacturing the assembly includes forming the wire bond using thermocompression or thermosonic ball bonding and then forming the connection joint using electroless plating.
Abstract:
A semiconductor chip assembly includes a semiconductor chip and a molded substrate. The chip includes a conductive pad. The molded substrate includes a base, a bump that extends above the base, and a through-hole in the base that is offset from the bump and aligned with the pad. A routing line covers the bump and extends along a top surface of the molded substrate to the through-hole and extends through the through-hole and contacts the pad. The molded substrate is compressible and permits a portion of the routing line that covers the bump to exhibit elastic deformation in response to vertically oriented external pressure. A method of manufacturing the assembly includes forming the molded substrate and attaching the molded substrate to the chip by transfer molding, exposing the pad using the through-hole, depositing a metal layer on the molded substrate and in the through-hole and on the pad, and removing a portion of the metal layer to form the routing line.
Abstract:
A method of connecting a conductive trace to a semiconductor chip includes aligning a conductive pad on the chip with a through-hole in the conductive trace while a base covers the through-hole on a side opposite the chip wherein the conductive trace and the base are different materials, removing some or all of the base thereby exposing the through-hole, and forming a connection joint in the through-hole that electrically connects the conductive trace and the pad. The method may include electroplating the conductive trace onto the base, mechanically attaching the chip to the conductive trace using an adhesive after aligning the pad and the through-hole and before removing some or all of the base, and forming an opening in the adhesive directly beneath the through-hole thereby exposing the pad after removing some or all of the base and before forming the connection joint.
Abstract:
A method of manufacturing a semiconductor chip assembly includes providing a semiconductor chip that includes a conductive pad, and providing a support circuit that includes an insulative base and a conductive trace. One embodiment includes mechanically attaching the chip to the support circuit using an adhesive such that a portion of the pad is directly beneath the conductive trace, and then applying an etch to form openings in the base and the adhesive such that the opening in the base exposes the conductive trace and the openings expose the pad. Another embodiment includes disposing an adhesive beneath the support circuit, applying an etch to form openings in the base and the adhesive, and then mechanically attaching the chip to the support circuit using the adhesive such that the opening in the base exposes the conductive trace and the openings expose the pad. Preferably, a connection joint is formed inside the openings that contacts and electrically connects the conductive trace and the pad.
Abstract:
The invention provides an apparatus and methods of using the apparatus to transfer conductive patterns onto substrates under conditions of heat and pressure. The apparatus comprises a master mold with a printing surface on which is produced a permanent mirror image of the conductive pattern to be created. This pattern is then coated with a loosely adherent film of conductive metal, such as copper, which is transferred onto a substrate to be printed.
Abstract:
A dielectric substrate is coated with a protective layer and a catalyst film is formed in a laser irradiated predetermined pattern on the protective layer so that during electroless deposition a metal is plated on the catalyst film in the predetermined pattern whether or not the dielectric has unwanted catalytic sites. The protective layer is not removed by the electroless plating bath or prior etch steps but can subsequently be stripped by a separate etch without removing the plated metal or the dielectric from the substrate.
Abstract:
A method of making a cavity substrate. The method includes: preparing a supporting board including a stiffener, a bump/flange sacrificial carrier, an adhesive and an electrical pad, wherein the adhesive bonds the stiffener to the sacrificial carrier; forming a careless build-up circuitry on the supporting board in contact with the bump and the stiffener; and removing the bump to form a cavity and expose the electrical pad from a closed end of the cavity; wherein the cavity is laterally covered and surrounded by the adhesive. A semiconductor device can be mounted on the cavity substrate and electrically connected to the electrical pad. The careless buildup circuitry provide signal routing for the semiconductor device while the built-in stiffener can provide adequate mechanical support for the careless build-up circuitry and the semiconductor device.
Abstract:
A semiconductor chip assembly includes a semiconductor device, a heat spreader, a conductive trace and an adhesive. The heat spreader includes a post, a base and a flange. The conductive trace includes a pad and a terminal. The semiconductor device extends into a cavity in the flange, is electrically connected to the conductive trace and is thermally connected to the heat spreader. The post extends upwardly from the base into an opening in the adhesive, the flange extends upwardly from the post in the opening and extends laterally above the adhesive, the cavity extends into the opening and the base extends laterally from the post. The conductive trace is located outside the cavity and provides signal routing between the pad and the terminal.
Abstract:
A semiconductor chip assembly includes a semiconductor device, a heat spreader, a conductive trace and dual adhesives. The heat spreader includes a bump, a base and a ledge. The conductive trace includes a pad and a terminal. The semiconductor device is mounted on the bump in a cavity in the bump, is electrically connected to the conductive trace and is thermally connected to the heat spreader. The bump extends into an opening in the first adhesive and is aligned with and spaced from an opening in the second adhesive. The base and the ledge extend laterally from the bump. The first adhesive is sandwiched between the base and the ledge, the second adhesive is sandwiched between the conductive trace and the ledge and the ledge is sandwiched between the adhesives. The conductive trace is located outside the cavity and provides signal routing between the pad and the terminal.
Abstract:
A method of making a semiconductor chip assembly includes providing a bump and a ledge, mounting a first adhesive on the ledge including inserting the bump into an opening in the first adhesive, mounting a conductive layer on the first adhesive including aligning the bump with an aperture in the conductive layer, then flowing the first adhesive between the bump and the conductive layer, solidifying the first adhesive, then providing a heat spreader that includes the bump, a base and the ledge, then mounting a second adhesive on the ledge, mounting a conductive trace that includes a pad and a terminal on the second adhesive, then mounting a semiconductor device on the bump in a cavity in the bump, electrically connecting the semiconductor device to the conductive trace and thermally connecting the semiconductor device to the heat spreader.