A semiconductor device includes (a) a printed wiring board, (b) a semiconductor chip mounted on the printed wiring board, (c) a molded resin formed on the printed wiring board, covering the semiconductor chip therewith, and (d) at least one metal wiring formed on the printed wiring board and extending externally beyond the molded resin. The metal wiring is plated with a metal having a small adhesion force with the molded resin. An interfacial surface between the metal and the molded resin acts as a path through which moisture contained in the semiconductor device escapes outside when the semiconductor device is heated.

 
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