Leadframe-based discrete components, such as MOSFETs, QFNs, SOTs, etc. are soldered onto the base substrate using a die attach process.  The typical or standard wire bond connection is partially replaced with clip bonding technology wherein the connection between the die and lead consists of a copper bridge that will also be soldered with a paste.  

ZESTRON’s aqueous and solvent based cleaning media, that have been specifically developed for cleaning leadframe-based discrete components, provide excellent cleaning results leading to higher bond quality, and therefore improved pull and shear test results as well as optimal molding adhesion. Cleaning agents attack the passivation leading to impairment of chip function.