Stmicroelectronics S.r.l.

Rosalba Cacciola

Cristiano Gianluca Stella

Giuseppe Luigi Malgioglio

Sebastiano Russo

Matteo Sebastiano Dimauro

An electronic device is attached to a first surface of a board which includes vias. A heat sink precursor for the electronic device is attached to the second surface of the electronic board. The heat sink precursor includes a cavity facing the vias. A wave of solder is applied to the second surface. The solder penetrates into the cavity of the heat sink precursor and flows by capillary action through the vias to join a thermal radiator and/or electronic contact of the electronic device to the vias. The solder further remains in the cavity to form a corresponding heat sink.

Manufacturing of a heat sink by wave soldering

An electronic device is attached to a first surface of a board which includes vias. A heat sink precursor for the electronic device is attached to the second surface of the electronic board. The heat sink precursor includes a cavity facing the vias. A wave of solder paste is applied to the second surface. The solder paste penetrates into the cavity of the heat sink precursor and flows by capillary action through the vias to weld a thermal radiator and/or electronic contact of the electronic device to the vias. The solder paste further remains in the cavity to form a corresponding heat sink.

An electronic system includes an insulating structural element with a coupling surface configured for coupling the electronic system with at least one further electronic system. The electronic system further includes at least one conducting contact element at least partially exposed on the coupling surface. Each conducting contact element has a soldering surface supporting reflow soldering of the conducting contact element with a corresponding further contact element of the further electronic system. In addition, each conducting contact element has at least one lateral surface protruding from the insulating structural element. The soldering surface of the conducting contact element includes at least one channel having an opened end at the protruding lateral surface, the channel configured to facilitate dispersion of waste gas produced during reflow soldering.

Electronic system for reflow soldering

An electronic board includes conducting traces having an upper surface at least partially sunken with respect to a gluing surface of the board. A surface mount technology electronic device for mounting to the board includes insulating windows that define gluing sites within one or more pins. An electronic system is formed by one or more of such surface mount technology electronic devices mounted to electronic board. The devices are attached using a wave soldering technique that flows through channels formed by the sunken conductive traces.

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Tremestrieri Etneo, Italy

Rosalba Cacciola