Micro lead frame package
View Patent ↗The present invention comprises a lead frame substrate adapted to receive semiconductor die and multiple passive components. The lead frame substrate is preferably formed from a single piece of electrically conductive material, such as copper, and may be mounted within a lead frame package or directly onto a circuit board. The lead frame substrate includes mounting surfaces adapted to receive the semiconductor dice and passive components. The mounting surfaces are linked together by temporary and/or permanent connection bars. A method to manufacture the lead frame package includes, among other steps, forming a lead frame substrate, applying a molding compound to the lead frame substrate to fix each mounting surface and connection bar in place, removing the temporary connection bars, mounting the semiconductor components on the lead frame substrate, and applying a packaging material over the lead frame substrate to encapsulate the semiconductor components.
1. A lead frame substrate, comprising:
a plurality of connection bars;
a semiconductor die pad being adapted to receive a semiconductor die;
a plurality of termination pads being linked together and to said semiconductor die pad by said plurality of connection bars, each one of said plurality of termination pads being adapted to receive a passive component and a bonding wire; and
a molding compound fixing said semiconductor die pad, said plurality of termination pads, and said plurality of connection bars together;
wherein said semiconductor die pad, said plurality of termination pads, and said plurality of connection bars include a top and bottom surface, and said molding compound leaves said top and bottom surfaces uncovered.
2. The lead frame substrate according to claim 1 , wherein said semiconductor die pad, said plurality of termination pads, and said plurality of connection bars comprise a thermally and electrically conductive material.
3. The lead frame substrate according to claim 2 , wherein said thermally and electrically conductive material comprises copper.
4. The lead frame substrate according to claim 1 , wherein said semiconductor die pad, said plurality of termination pads, and said plurality of connection bars have a unitary construction from a common piece of material.
5. The lead frame substrate according to claim 1 , further comprising a plurality of leads located around a periphery of the lead frame substrate.
6. The lead frame substrate according to claim 1 , wherein said at least one permanent connection bar electrically couples said semiconductor die pad to at least one of said plurality of termination pads.
7. The lead frame substrate according to claim 1 , wherein said at least one permanent connection bar electrically couples selected ones of said plurality of termination pads together.
8. The lead frame substrate according to claim 1 , wherein said plurality of connection bars comprises permanent connection bars and temporary connection bars.
9. The lead frame substrate according to claim 8 , wherein said temporary connection bars are adapted to be removed from the lead frame substrate after said molding compound has fixed said semiconductor die pad, said plurality of termination pads, and said plurality of connection bars together.
10. The lead frame substrate according to claim 1 , wherein the lead frame substrate comprises a substantially uniform thickness.
11. The lead frame substrate according to claim 1 , wherein the lead frame substrate is adapted for being mounted to a circuit board.
12. The lead frame substrate according to claim 11 , wherein only said semiconductor die pad and said plurality of leads contact the circuit board when the lead frame substrate is mounted on the circuit board.