摘要:
A flexible film is made into a substrate (100) having metallization patterns. A semiconductor device (106) is affixed to the substrate, and the assembly is heated to expand the substrate. A cover (110) is attached to the substrate, over the device (106). Upon cooling, the substrate (100) shrinks and becomes taut and planar within the reinforced area. Alternatively, a reinforcing ring (210) can be attached to the substrate (200) either before or after attachment of the semiconductor device (206).
摘要:
A method of manufacturing a chip carrier from a universal ceramic substrate provides for a universal ceramic substrate having first and second opposed sides and an array of conductively filled through-holes. On the first side, wire bond pads and conductors connected to the conductively filled through-holes are provided as required. Similarly, on the second side, solder pads on the conductively filled through-holes are provided as required. Finally, at least one insulating layer is provided over part of the first side for die attachment.
摘要:
A method of adhering a polyimide to a substrate includes first placing the substrate in a dilute acid solution. The substrate is then placed in a palladium and tin solution followed by a rinse with water. The rinsed substrate is placed in an accelerator solution to substantially remove the tin from the substrate. The palladium which remains on the substrate surface provides nucleation sites for adhesion promotion and enhanced wetting of polyimide which is applied in a liquid form as by spraying or spinning. Adhesion of polyimide to metals such as gold, ceramics, alumina or polyimide is thereby provided.
摘要:
An integrated circuit package (10) comprises a semiconductor die (14) having a top surface and a bottom surface, and a substrate (16) for receiving the semiconductor die. The substrate should have an aperture(s) (18) below the semiconductor die for providing moisture relief during temperature excursions. An adhesive (20) applied to the substrate allows for mounting the semiconductor die to the substrate. Then, the semiconductor die is wirebonded to the substrate. Finally, an encapsulant (12) for sealing the top surface of the semiconductor die is formed over the semiconductor die and portions of the substrate.
摘要:
A die pad (108) with a punched hole providing a throughway (110) is affixed upon the chip carrier base 100. Such throughway permits the electronic interconnection of the die backside (112) to a conductive runner (104) by electrically conductive material (110) set between the die backside (112) and the conductive runner (104).
摘要:
A shielded semiconductor package and a method for manufacturing the package is provided. The shielded semiconductor package comprises a substrate (10) having a metallization pattern (12, 13), with one portion of the metallization pattern being a circuit ground (13). A semiconductor device (16) is electrically interconnected (17) to the metallization pattern (12). A perforated metal shield or screen (18) covers the semiconductor device (16) and is electrically and mechanically attached to the metallization circuit ground (13) in order to shield the semiconductor device (16) from radio frequency energy. A resin material (14) is transfer molded about the semiconductor device, the electrical interconnections, and the metal screen to form the completed package.
摘要:
A semiconductor device package comprises an integrated circuit chip (10), a substrate (16), an encapsulant (30), and an organic coupling agent or underfill material (12) disposed between the integrated circuit chip and the first side of the substrate. The chip has a plurality of interconnection pads (14) disposed on an active surface of the chip at some minimum spacing "X." Each of the interconnect pads also has electrically conducting bumps (26) on them. The substrate has a circuit pattern (20) on a first side and an array of solder pads (23) spaced a certain distance apart on an opposite side of the substrate. The distance between these pads is greater than the minimum distance (X) between the interconnect pads on the IC. The circuit pattern is electrically connected to the array of solder pads by plated through holes (22). The length and width of the circuit carrying substrate is substantially greater than the length and width of the integrated circuit chip. The chip is mounted face down to the substrate with the electrically connecting bumps, such that at least some of the plated through holes in the substrate are covered by the chip. The polymeric encapsulant (30) covers the entire chip and substantially all of the first side of the substrate, providing a sealed package.
摘要:
An integrated circuit package (10) comprises a semiconductor die (14), and a substrate (16) for receiving the semiconductor die. The substrate has an aperture(s) (18) below the semiconductor die for providing moisture relief during temperature excursions. The semiconductor die is wirebonded to the substrate. An encapsulant (12) seals the top surface of the semiconductor die and serves to bond the semiconductor die to the substrate. The encapsulant also covers portions of the top side of the substrate.
摘要:
A flexible substrate (100) carries circuitry (102) in one area of the substrate and other portions of the substrate are at least partially covered with conductive material (206) to provide a ground plane. The substrate is folded about the circuitry to form an enclosure shielding the circuit.
摘要:
A liquid crystal device (5) is made by providing an LCD sandwich made of two glass substrates (20) with electrodes, spacers (21), and an uncured sealant (22). A gap (26) with a specified internal volume lies between the two glass substrates. A vacuum reservoir (23) having an internal volume substantially larger than the internal volume of the gap is temporarily attached to the LCD sandwich to align the glass substrates and hold them in place. The LCD sandwich and vacuum reservoir are placed into a conformable container or vacuum bag (24). A vacuum is drawn on the bag so that the bag walls contact the LCD sandwich, and the bag is sealed to maintain the vacuum. The assembly is then heated while under vacuum for a time and a temperature sufficient to cause the gap in the LCD sandwich to decrease to a desired final gap and to cure the sealant.