Patent ID: 7670879

Claim:
A manufacturing method of a semiconductor module comprising: a first joining step for joining first circuit electrodes which are formed on a circuit board and back-surface-side die electrodes of a semiconductor die which forms die electrodes on both front and back surfaces; a second joining step for joining the front-surface-side die electrodes of the semiconductor die and one ends of linear or plate-like connecting members; and a third joining step for joining another ends of the connecting members and second circuit electrodes which are formed on the circuit board; wherein each of the first joining step, the second joining step and the third joining step, a low-melting-point metal layer is preliminarily formed on at least one of a pair of conductive portions to be connected with each other and, thereafter, the pair of conductive portions are arranged to face each other and are heated and pressurized at a temperature which melts at least the low-melting-point metal thus diffusing the low-melting-point metal layer into the pair of conductive portions by solid-liquid diffusion whereby the pair of conductive portions are joined to each other; and wherein the first joining step, the second joining step and the third joining step are performed sequentially.