Methods for enclosing a thermoplastic package
A circuit package for housing semiconductor or other integrated circuit devices (“die”) includes a high-copper flange, one or more high-copper leads and a liquid crystal polymer frame molded to the flange and the leads. A lid is welded to the frame after a die is attached to the flange.
1 . A method for enclosing a circuit package, comprising ultrasonically welding a thermoplastic material lid to a thermoplastic material frame of the circuit package using a welding signal having a frequency between about 50 KHz and about 60 KHz and an amplitude less than about 100 microns.
2 . The method of claim 1 , wherein the amplitude is less than about 60 microns.
3 . A method for enclosing a circuit package, comprising laser welding a thermoplastic material lid to a thermoplastic material frame of the circuit package.
4 . A method for enclosing a circuit package, comprising thermal welding a thermoplastic material lid to a thermoplastic material frame of the circuit package.