Stmicroelectronics S.r.l.

Sebastiano Russo

Crocifisso Marco Antonio Renna

Marco Alfio Torrisi

Michele Calabretta

Cristiano Gianluca Stella

Rosalba Cacciola

Matteo Sebastiano Dimauro

A method for soldering a die obtained using the semiconductor technique with a leadframe, comprising the steps of providing a leadframe, which has at least one surface made at least partially of copper; providing a die, which has at least one surface coated with a metal layer; applying to the surface a solder alloy comprising at least 40 wt % of tin or at least 50% of indium or at least 50% of gallium, without lead, and heating the alloy to a temperature of at least 380&#xb0; C. to form a drop of solder alloy; providing a die, which has at least one surface coated with a metal layer; and setting the metal layer in contact with the drop of solder alloy to form the soldered connection with the leadframe. Moreover, a device obtained with said method is provided.

Method for the manufacture of integrated devices including a die fixed to a leadframe

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

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Catania, Italy

Sebastiano Russo