Patent ID: 7361530

Claim:
A manufacturing of fabricating a multichip module, including a step of selecting one of a first photomask using a metal film as an opaque member for an exposure light and a second photomask using an organic photoreactive resin film as an opaque member for an exposure light, the method comprising the steps of: fabricating a plurality of first semiconductor integrated circuit devices, so as to include at least one step of forming a predetermined pattern onto a first semiconductor substrate by using the first photomask having the metal film as the opaque member for the exposure light; fabricating a plurality of second semiconductor integrated circuit devices, so as to include at least one step of forming a predetermined pattern onto a second semiconductor substrate by using the second photomask having the organic photoreactive resin film as the opaque member for the exposure light; and packaging the first semiconductor integrated circuit device and the second semiconductor integrated circuit device on the same printed wiring board, wherein, in the step of selecting one of the first photomask and the second photomask, the first photomask using the metal film as the opaque member for the exposure light is used when a number of exposed wafers or a number of wafer exposure treatments per photomask is equal to or larger than a predetermined value, and the second photomask using the organic photoreactive resin film as the opaque member for the exposure light when it is smaller than the predetermined value.