Integrated circuit used for chip cards and smart cards comprises electronic components integrated on silicon chip and connectors providing metal wire welding areas

摘要

The integrated circuit comprises electronic components (32) integrated on a silicon chip (31) and connectors for welding metal wires (14). The connectors comprise metallized depressions (34) of depth 40-120 microns made on the silicon chip surface and providing welding areas for metal wires located below the silicon wafer surface plane. The depressions (34) are made by isotropic chemical etching and comprise four sides forming an angle of 58 deg relative to the chip surface. The depressions (34) either have a flat bottom or their walls meet at the bottom of the depressions (34). The bottom and the walls of the depressions (34)are covered with a metal layer (35) extending to the surface of the chip in the form of conductive tracks. Independent claims are given for: (a) an electronic micro-module comprising an integrated circuit as above and being fixed to a support and connected to the support by wiring ultrasonically welded to the bottom of the depressions; (b) a portable electronic item comprising the micro-module; and (c) production of an integrated circuit on a monocrystalline silicon chip.