Patent ID: 6897567

Claim:
A method of making a semiconductor device, the method comprising the steps of: mounting a semiconductor chip on a lower conductor, with first solder material applied between the chip and the lower conductor; positioning an upper conductor on the chip, with second solder material applied between the chip and the upper conductor; simultaneously heating up the first and the second solder materials beyond melting points of the respective solder materials such that the first and the second solder materials are simultaneously in a molten state; and solidifying the first and the second solder materials; wherein the lower conductor includes a die pad portion for mounting the semiconductor chip; and wherein the first solder material has a melting temperature higher than that of the second solder material and is caused to solidify earlier than the second solder material in the solidifying step for securing the semiconductor chip on the die pad portion of the lower conductor before the upper conductor is fixedly connected to the semiconductor chip.