Patent ID: 6858468

Claim:
A method for attaching an optical device package to a semiconductor device package, the bottom surface of the optical device package having electrical contact surfaces, comprising: providing the semiconductor device package, the operation of providing the semiconductor device package including, providing a semiconductor die that has a top surface; forming a first plurality of solder ball formations on the top surface of the semiconductor die; and encapsulating the semiconductor die and the first plurality of solder ball formations within a protective molding material such that a top surface of each solder ball formation of the first plurality of solder ball formations is exposed and forms electrical contact surfaces on the top surface of the semiconductor device package; applying a second plurality of solder ball formations onto the electrical contact surfaces; reflowing the second plurality of solder ball formations; placing a bottom surface of the optical device package onto the top surface of the semiconductor device package such that electrical contact surfaces on the bottom surface of the optical device package make contact with associated ones of the second plurality of solder ball formations; and reflowing the second plurality of solder ball formations whereby a strong bond is created between the optical and semiconductor device packages.