Abstract:
A microelectronic assembly (10,100) includes a component (12,102) attached to a substrate (14,104) by a variable thickness solder joint (30,108) . The solder joint comprises a first thickness (t1) adjacent the central region (20,110) of the component and a second, relatively greater thickness (t2) adjacent the perimeter region (22,112) of the component. The variable thickness solder joint may be used for attaching a power die to a metal heat sink on a printed circuit board (16,106), so that the relatively thin central portion promotes thermal dissipation to maintain the die within a desired operating temperature range, and the relatively thick perimeter region distributes thermally induced stresses to enhance joint strength and reduce fatigue cracking.
Abstract:
An electronic assembly (10) is provided having a thermal cooling fluid, such as a liquid, for cooling an electronic device (20) within a sealed compartment. The assembly (10) includes a housing generally defining a sealed fluid compartment, an electronic device (20) disposed within the housing (16) and a cooling liquid for cooling the electronic device (20). The assembly (10) includes inlet and outlet ports (44 and 46) in fluid communication with the sealed fluid compartment for allowing the cooling liquid to pass through the compartment to cool the electronic device (20). Fluid flow channels (26) are formed in thermal communication with the electronic device (20) within the housing (16). The fluid channels (26) include channels that allow liquid to flow in thermal communication with the electronic device (20) to cool the device (20).
Abstract:
An integrated circuit assembly 10 is provided, including a substrate 14 having at least one substrate contact surface 18, an integrated circuit device 12 having at least one first contact surface 16, and a bar bond element 22. The bar bond element 22 provides communication between the at least one substrate contact surface 18 and the at least one first contact surface 16. The bar bond element 22 includes a conductive plate element 23 having an integrated circuit foot portion 24, a substrate foot portion 26 and a strain relief loop 46 positioned between the integrated circuit foot portion 24 and the substrate foot portion 26.
Abstract:
An electronic assembly including a circuit board (16) and a flexible circuit interconnect (14) is overmolded by fixturing the assembly in a mold cavity such that a portion of the flexible circuit (14) protrudes from the mold, and providing a compressible elastomeric interface (18a/20a, 32) between the mold (18, 20) and the flexible circuit (14) to seal off the mold cavity and protect the flexible circuit (14) from damage due to the clamping force of the mold (18, 20). The portion of the flexible circuit (14) within the mold cavity is pre-coated with a material that ensures good adhesion with the molding compound (30), and a heat exchanger (26) thermally coupled to the portion of the flexible circuit (14) that protrudes from the mold protects the flexible circuit (14) from damage due to thermal conduction from the mold (18, 20) and mold compound (30).
Abstract:
A solderable bar bond connector (16) establishes a primary interconnect between a substrate (12) and a high current terminal (34) of an IC chip (14) mounted on the substrate (12), and one or more secondary interconnects between the substrate (12) and low current terminals (36, 38, 40) of the IC chip (14). The bar bond connector (16) includes a plate portion (18) soldered to the high current terminal (34) of the IC chip (14) and a plurality of leg elements (20-32) extending from the plate portion (18) to multiple bond sites (42, 44, 46, 48) on the substrate (12). The underside of at least one leg element (20/26/32) is provided with a secondary circuit (50/52/54) including a conductor (58) that is electrically isolated from the respective leg element (20/26/32). The conductor (58) of the secondary circuit (50/52/54) is soldered to both the substrate (12) and a low current terminal (36/38/40) of the IC chip (14) for establishing a secondary interconnect in addition to the primary interconnect established by the plate portion (18) and the other leg elements (22, 24, 28, 30).
Abstract:
The present invention relates to an apparatus and method for dissipating heat from high-power electronic devices. The assembly (10,100) includes a high-current substrate (16,116), such as a printed circuit board supporting an electronic device (12,14,112), a heat pipe (26,28) thermally coupled with the electronic device and an assembly case (20,120) which also forms a heat sink, and thermal transient suppression material (34) which may be thermally coupled with the electronic device and the heat pipe.
Abstract:
A thermal conductor (16) suitable for communicating heat from an integrated circuit (14) to a thermal transfer device (18) is disclosed. The thermal conductor (16) comprises a base having a first portion (22) and a second portion (24), wherein the first portion (22) is adapted to be positioned substantially planar to and proximate the integrated circuit (14), and further wherein the second portion (24) includes sidewalls that define an aperture (26) in the body and forms a spherical cavity, and wherein the aperture (26) is adapted to pivotally receive at least a portion of the thermal transfer device (18) such that at least a portion of the thermal transfer device (18) is in thermal communication with the integrated circuit (14).
Abstract:
An electronic assembly including a circuit board (16) and a flexible circuit interconnect (14) is overmolded by fixturing the assembly in a mold cavity such that a portion of the flexible circuit (14) protrudes from the mold, and providing a compressible elastomeric interface (18a/20a, 32) between the mold (18, 20) and the flexible circuit (14) to seal off the mold cavity and protect the flexible circuit (14) from damage due to the clamping force of the mold (18, 20). The portion of the flexible circuit (14) within the mold cavity is pre-coated with a material that ensures good adhesion with the molding compound (30), and a heat exchanger (26) thermally coupled to the portion of the flexible circuit (14) that protrudes from the mold protects the flexible circuit (14) from damage due to thermal conduction from the mold (18, 20) and mold compound (30).
Abstract:
A thermal conductor (16) suitable for communicating heat from an integrated circuit (14) to a thermal transfer device (18) is disclosed. The thermal conductor (16) comprises a base having a first portion (22) and a second portion (24), wherein the first portion (22) is adapted to be positioned substantially planar to and proximate the integrated circuit (14), and further wherein the second portion (24) includes sidewalls that define an aperture (26) in the body and forms a spherical cavity, and wherein the aperture (26) is adapted to pivotally receive at least a portion of the thermal transfer device (18) such that at least a portion of the thermal transfer device (18) is in thermal communication with the integrated circuit (14).