Abstract: A unit includes one or more semiconductor chips. Each chip has a front surface with a plurality of contacts surrounded by a passivated surface. The passivated surface is not wettable by bonding material. The contacts have masses of bonding material thereon and the masses have a height less than the diameter of the contacts.

Abstract: A microelectronic element is with a connection component having a polymeric body, and a bonding material is provided between contacts on the microelectronic element and conductive features of the connection component. The microelectronic element is heated so as to activate the bonding material, and then cooled, leaving said contacts on said microelectronic element bonded to said conductive features on the connection component. The connection component is maintained at an average temperature below the glass transition temperature of the polymer in the connection component during the heating and cooling steps.

Abstract: A Microelectronic Bonding processes wherein a microelectronic element is connected with a connection component having a polymeric body, and a bonding material is provided between contacts on the microelectronic element and conductive features of the connection component. The microelectronic element is heated so as to activate the bonding material, and then cooled, leaving said contacts on said microelectronic element bonded to said conductive features on the connection component. The connection component is maintained at an average temperature below the glass transition temperature of the polymer in the connection component during the heating and cooling steps.

Abstract: A unit includes one or more semiconductor chips. Each chip has a front surface with a plurality of contacts surrounded by a passivated surface. The passivated surface is not wettable by bonding material. The contacts have masses of bonding material thereon and the masses have a height less than the diameter of the contacts.

Abstract: A microelectronic element is provided with small meniscus-shaped solder masses, and these masses are connected to deformable connecting elements such as flexible leads. The connections can be made under vacuum in a chamber or in a space enclosed in part by a flexible film. Atmospheric pressure on the flexible film can urge the components together during bonding. Temporary securements such as adhesive bonds between the microelectronic element and the component can hold the microelectronic element in place relative to the component while electrical connections are made by conductive bonding material such a solder.

Abstract: A microelectronic element is provided with small meniscus-shaped solder masses, and these masses are connected to deformable connecting elements such as flexible leads. The connections can be made under vacuum in a chamber or in a space enclosed in part by a flexible film. Atmospheric pressure on the flexible film can urge the components together during bonding. Temporary securements such as adhesive bonds between the microelectronic element and the component can hold the microelectronic element in place relative to the component while electrical connections are made by conductive bonding material such a solder.