Partially-molded, PCB chip carrier package for certain non-squar

Details Partially-molded, PCB chip carrier package for certain non-squar Partially-molded, PCB chip carrier package for certain non-squar

1995-05-02

1997-01-14

Thompson, Gregory D.

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

257666, 257678, 257787, 257707, 361717, 361728, 361764, 361813, H05K 111

Patent

active

055946267

ABSTRACT:
A dambar-less leadframe is sandwiched between two printed circuit boards (PCBs). The PCBs form a major portion of the package body, and isolate the leadframe leads from plastic molding compound. In one embodiment, an upper PCB (substrate) is formed as a ring, having an opening containing a heat sink element. A lower PCB is also formed as a ring, and has a smaller opening for receiving a die. The back face of the die is mounted to the heat sink. The exposed front face of the die is wire bonded to inner ends of conductive traces on the exposed face of the lower PCB. The outer ends of the traces are electrically connected to the leadframe leads by plated-through vias extending through the two PCBs. The plated-through vias additionally secure the sandwich structure together. Plastic molding compound is injection/transfer molded over the front face of the die and the bond wires, forming a partially-molded package. In another embodiment, the upper PCB is a solid planar element. The back face of the die is mounted to the inside surface of the upper PCB. The die, die-receiving area, and/or package body shape have a "certain non-square" shape (i.e., triangle, trapezoid, parallelogram, greatly-elongated rectangle, etc.).

REFERENCES:
patent: 3871014 (1975-03-01), King et al.
patent: 4763188 (1988-08-01), Johnson
patent: 4949225 (1990-08-01), Sagisaka et al.
patent: 5012386 (1991-04-01), McShane et al.
patent: 5172303 (1992-12-01), Bernadoni et al.
patent: 5195023 (1993-03-01), Manzione et al.

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