Semiconductor device package with integrated heat spreader
View Patent ↗A multi chip housing has a lead frame to which plural die are soldered. A heat spreader conductive cap encloses a volume containing the plural die or chips and is fixed to the periphery of the lead frame. The tops of the die are closely spaced from the interior of the cap and the volume is filled with a thermally conductive, electrically insulating plastic encapsulant.
1. A semiconductor device package comprising:
a lead frame having a plurality of spaced contact areas;
at least a first and second semiconductor die coplanar with one another and each having at least one contact on one surface thereof, said contact of each of said die being electrically and mechanically connected to a respective one of said plurality of spaced contact areas of said lead frame, the tops of said first and second die being at least approximately coplanar; and
a conductive heat spreader fixed to a peripheral area of said lead frame and forming a volume atop said lead frame, which volume contains said at least first and second die, the interior surface of said conductive heat spreader being parallel to said tops of said first and second die and being closely spaced apart from said tops of said first and second die by a gap of said volume, but insulated from said first and second die and permitting effective heat transfer from the die to the heat spreader;
said conductive heat spreader including one or more openings allowing access to an entirety of said volume; and
said lead frame and said conductive heat spreader providing two sided cooling for said at least first and second die.
2. The package of claim 1 , which further includes a thermally conductive, electrically insulating plastic volume filling said volume.
3. The package of claim 2 , wherein said conductive heat spreader has a plurality of openings therethrough for permitting the injection of said plastic into said volume after said heat spreader is fixed to said lead frame.
4. The package of claim 1 , wherein at least one of said die is a MOSFET.
5. The package of claim 1 , wherein at least one of said die is an integrated circuit and wherein another of said die is a MOSgated device to be controlled by said integrated circuit.
6. The package of claim 1 , wherein said conductive heat spreader has a cap shape with a central web having a rim extending therefrom; said rim connected to said lead frame.
7. The package of claim 4 , which further includes a thermally conductive, electrically insulating plastic filling said volume.
8. The package of claim 5 , which further includes a thermally conductive, electrically insulating plastic filling said volume.
9. The package of claim 6 , which further includes a thermally conductive, electrically insulating plastic filling said volume.
10. The package of claim 7 , wherein said conductive heat spreader has a plurality of openings therethrough for permitting the injection of said plastic into said volume after said heat spreader is fixed to said lead frame.
11. The package of claim 8 , wherein said conductive heat spreader has a plurality of openings therethrough for permitting the injection of said plastic into said volume after said heat spreader is fixed to said lead frame.
12. The package of claim 9 , wherein said conductive heat spreader has a plurality of openings therethrough for permitting the injection of said plastic into said volume after said heat spreader is fixed to said lead frame.
13. A semiconductor device package comprising:
a lead frame having a plurality of spaced contact areas;
at least a first and second semiconductor die coplanar with one another and each having at least one contact on one surface thereof, said contact of each of said die being electrically and mechanically connected to a respective one of said plurality of spaced contact areas of said lead frame, the tops of said first and second die being approximately coplanar;
a conductive heat spreader fixed to a peripheral area of said lead frame and forming a volume atop said lead frame, which volume contains said at least first and second die, the interior surface of said conductive heat spreader being parallel to said tops of said first and second die and being closely spaced apart from said tops of said first and second die by a gap of said volume, but insulated from said first and second die and permitting effective heat transfer from the die to the heat spreader;
said conductive heat spreader including one or more openings allowing access to an entirety of said volume; and
a thermally conductive but electrically insulating plastic encapsulant substantially filling said entirety of said volume;
said lead frame and said conductive heat spreader providing two sided cooling for said at least first and second die.
14. The package of claim 13 , wherein said conductive heat spreader has a plurality of openings therethrough for permitting the injection of said plastic into said volume after said heat spreader is fixed to said lead frame.
15. The package of claim 13 , wherein at least one of said die is a MOSFET.
16. The package of claim 13 , wherein at least one of said die is an integrated circuit and wherein another of said die is a MOSgated device to be controlled by said integrated circuit.
17. The package of claim 13 , wherein said conductive heat spreader has a cap shape with a central web having a rim extending therefrom; said rim connected to said lead frame.
18. The package of claim 13 , wherein said lead frame is configured to form a surface mount for said semiconductor device package.
19. The package of claim 13 , wherein said lead frame is configured to form pin connections for said semiconductor device package.
20. The package of claim 13 , wherein at least one of said contact of said die is a planar solderable electrode.