摘要:
A semiconductor chip carrier having an increased chip connector and plated through hole density. In particular, a substrate having a plurality of plated through holes therein, and a fatigue resistant redistribution layer thereon. The redistribution layer includes a plurality of vias selectively positioned over and contacting the plated through holes. The substrate further including a ground plane, two pair of signal planes, and two pair of power planes, wherein the second pair of power planes are located directly underneath the external dielectric layer. A buried plated through hole within the substrate.
摘要:
An electrical structure, and associated method of fabrication, for reducing thermally induced strain in a soldered interface, such as a solder ball or a solder column, between a chip carrier (or chip) and an electronic carrier such as a circuit card. The thermally induced strain may be caused during thermal cycling by a mismatch in coefficient of thermal expansion (CTE), and consequent differential rates in thermal expansion, between the chip carrier (or chip) and the electronic carrier. The thermally induced strain may also exist with a large chip carrier characterized by a large temperature difference during thermal transients between the electronic carrier and localized regions of the chip carrier, even in the absence of a CTE mismatch. The electrical structure of the present invention includes an interposing compliant layer of soft and spongy material between the chip carrier (or chip) and the electronic carrier. Thermal strains resulting from the differential rates of thermal expansion are diverted from the soldered interface into small motions of material within the compliant layer.
摘要:
A method and structure for reducing thermally induced strains on the solder joints that couple a ball grid array (BGA) module to a circuit card, so as to improve the fatigue life of the BGA module. The thermally induced strains arise from a mismatch in thermal expansion coefficient between the dielectric substrate of the BGA module and the dielectric board of the circuit card. The method generates void annular regions around portions of the BGA dielectric substrate to which the BGA solder balls are to be attached and/or around portions of the circuit card dielectric material to which the BGA module is to be attached. This results in the formation of dielectric islands or peninsulas that bound the solder balls of the BGA module after installation on the circuit card. The dielectric islands or peninsulas thus formed serve to increase the effective height over which the differential expansion is accommodated, thereby reducing the strains throughout the solder joints. Additionally, the void annular regions provide space for the deformation of the dielectric islands or peninsulas, thereby increasing their compliance and transferring strain from the solder joints to the dielectric islands or peninsulas.
摘要:
Disclosed is a parallel processor packaging structure and a method for manufacturing the structure. The individual logic and memory elements are on printed circuit cards. These printed circuit boards and cards are, in turn, mounted on or connected to circuitized flexible substrates extending outwardly from a laminate of the circuitized, flexible substrates. Intercommunication is provided through a switch structure that is implemented in the laminate. The printed circuit cards are mounted on or connected to a plurality of circuitized flexible substrates, with one printed circuit card at each end of the circuitized flexible circuit. The circuitized flexible substrates connect the separate printed circuit boards and cards through the central laminate portion. This laminate portion provides XY plane and Z-axis interconnection for inter-processor, inter-memory, inter-processor/memory element, and processor to memory bussing interconnection, and communication. The planar circuitization, as data lines, address lines, and control lines of a logic chip or a memory chip are on the individual printed circuit boards and cards, which are connected through the circuitized flex, and communicate with other layers of flex through Z-axis circuitization (vias and through holes) in the laminate.
摘要:
A method of making a circuitized substrate in which pairs of vertically oriented though holes are formed such that at least one of the through holes is partially embedded within a lower one, thus assuring a sound connection following subsequent lamination or other steps the substrate including such holes is subjected to during manufacture. An electrical assembly including a substrate with such features is also provided.
摘要:
A method for forming a flip-chip joinable substrate having non-plated-on contact pads. The substrate has an external metal foil layer upon a dielectric layer upon a patterned internal metal layer having an internal contact area. An area of the external metal foil layer above the internal contact area is selected. A microvia cavity extending to the internal contact area is perforated centrally within the selected area and is filled with a mass of conductive paste forming an external contact pad. The external contact pad is used as an etch mask for removing the adjacent external metal foil.
摘要:
A semiconductor chip carrier having an increased chip connector and plated through hole density. In particular, a substrate having a plurality of plated through holes therein, and a fatigue resistant redistribution layer thereon. The redistribution layer includes a plurality of vias selectively positioned over and contacting the plated through holes. The substrate further including a ground plane, two pair of signal planes, and two pair of power planes, wherein the second pair of power planes are located directly underneath the external dielectric layer. A buried plated through hole within the substrate.
摘要:
A method of making a multi-layered interconnect structure. First and second electrically conductive members are formed on the first and second dielectric layers, respectively. The dielectric layer are formed on opposing surfaces of a thermally conductive layer. A first and second electrically conductive layer is formed within the first dielectric layer. The second electrically conductive layer includes shielded signal conductors and is positioned between the first electrically conductive layer and the thermally conductive layer. A plated through hole (PTH) formed through the interconnect structure is electrically connected to one of the first and second electrically conductive members and to one of the shielded signal conductors. A third dielectric layer, formed on the first dielectric layer and on portions of the first electrically conductive members, substantially overlies the PTH and includes a high density interconnect layer for providing an electrical path from an electronic device to the shielded signal conductors.
摘要:
A method and associated structure for excising laminate chip carriers from a panel that has a thickness less than about 100 mils. A laser beam is focused on a surface of the panel, and the panel is moved relative to the laser beam in a geometric pattern, such that cells of the panel (e.g., chip carriers) are excised from the panel. The laser parameters include a wavelength between about 500 nanometers and about 600 nanometers, a pulse width greater than about 100 nanoseconds and less than about 350 nanoseconds, an average power of at least about 1 watt, a pulse repetition rate between about 5,000 pulses/sec and about 20,000 pulses/sec, and a target diameter (D) between about 2 microns and about 30 microns. The kerf width between adjacent excised cells is between about 2 microns and about 75 microns. The width of an excised cell is at least 5 mm. A displacement between successive pulses of the laser beam is less than about 2D. The panel may comprise a layered structure that includes an organic layer and a metal layer. The laser includes, inter alia, a lasant of Nd:YAG, Nd:YLF, Nd:YAP, or Nd:YVO4. The method of the present invention wastes less panel area by at least a factor of about 13 than does the mechanical excising techniques of the related art.
摘要:
An electronic package and method of making the electronic package is provided. The package includes a semiconductor chip and an multi-layered interconnect structure. The semiconductor chip includes a plurality of contact members on one of its surfaces that are connected to the multi-layered interconnect structure by a plurality of solder connections. The multi-layered interconnect structure is adapted for electrically interconnecting the semiconductor chip to a circuitized substrate (eg., circuit board) with another plurality of solder connections and includes a thermally conductive layer being comprised of a material having a selected thickness and coefficient of thermal expansion to substantially prevent failure of the solder connections between said first plurality of electrically conductive members and the semiconductor chip. The electronic package further includes a dielectric material having an effective modulus to assure sufficient compliancy of the multi-layered interconnect structure during operation.