Selection criteria of press-materials and packaging conditions for power electron devices

Some design and technological restrictions of using known press-materials and packaging methods within package technology of power electron devices in the epoxy molded housings of ISOWATT-218 type have been examined. The results of experimental research of the device hermetic condition after their testing at high temperatures and humidity have been described. It is shown that a value of the housing thermal resistance for a certain press-material depends on process conditions, in particular depends on a velocity of the press-material injection into a form through founding channels. It has been discovered that the bigger diaphragm diameter (leading to increasing the velocity of the press-material injection into all parts of a press-form) leads to increase of the value of RT. Dependencies have a nonlinear character. The level of RTvalue depends on a press-material type. The conditions of packaging process with RTvalues of 2,5 - 3 °C / W have been founded for the press-materials MG-40F and EME 596. Decrease of an anti-adhesive grease that contains in the Russian press-material of MEP-5T type as well as the press-tablets prior heating exclusion leads to better quality of the plastic housing process formation.