Lead frame with power bar for semiconductor device
A lead frame for a packaged semiconductor device has multiple, configurable power bars that can be selectively electrically connected, such as with bond wires, to each other and/or to other leads of the lead frame to customize the lead frame for different package designs. One or more of the configurable power bars may extend into one or more cut-out regions in a die paddle of the lead frame, which allows for short bond wires to be used to connect the power bars to die pads of a semiconductor die mounted on the die paddle.
1. A lead frame for a semiconductor device, comprising:
a die paddle;
a plurality of leads adjacent to the die paddle;
a plurality of power bars adjacent to the die paddle, wherein:
a first power bar of the plurality of power bars comprises a radial lead segment connected to a tangential bar segment proximal to the die paddle; and
the tangential bar segment is directly connected to the die paddle; and
a tape attached to the radial lead segment of the first power bar and at least one of the plurality of leads that is adjacent to the radial lead segment of the first power bar, wherein the radial lead segment of the first power bar is supported by the tape.
2. The lead frame of claim 1 , further comprising:
an outer support structure surrounding the die paddle; and
wherein a second power bar of the plurality of power bars comprises:
a radial lead segment connected to a tangential bar segment proximal to the die paddle, and directly connected to the outer support structure.
3. The lead frame of claim 2 , wherein the tangential bar segment of the second power bar is not directly connected to the die paddle.
4. The lead frame of claim 1 , wherein the tangential bar segment of the first power bar is directly connected to the die paddle by a separable support structure.
5. The lead frame of claim 4 , wherein the separable support structure has an intermediate portion that separates the support structure into two separated elements.
6. The lead frame of claim 4 , wherein the separable support structure is configured to be severed into two separated elements during an offset operation.
7. The lead frame of claim 1 , wherein the first power bar is not connected along its radial lead segment to any other part of the lead frame.
8. The lead frame of claim 1 , wherein:
the die paddle has a cut-out region along a side thereof; and
the tangential bar segment of the first lead extends into the cut-out region of the die paddle.
9. A lead frame based semiconductor device, comprising:
a die paddle;
a plurality of leads adjacent to the die paddle;
a plurality of power bars adjacent to the die paddle, wherein:
first and second power bars each comprise a radial lead segment connected to a tangential bar segment proximal to the die paddle; and
the tangential bar segment of the first power bar is electrically connected to the tangential bar segment of the second power bar with a first bond wire; and
a tape attached to the radial lead segment of the first power bar and at least one of the plurality of leads that is adjacent to the radial lead segment of the first power bar, wherein the radial lead segment of the first power bar is supported by the tape.
10. The semiconductor device of claim 9 , wherein the radial lead segment of the first power bar provides an external connection to the semiconductor device.
11. The semiconductor device of claim 10 , wherein the radial lead segment of the second power bar is not configured to provide an external connection to the semiconductor device.
12. The semiconductor device of claim 9 , wherein the radial lead segment of the first power bar is not configured to provide an external connection to the semiconductor device.
13. The semiconductor device of claim 9 , wherein the radial lead segment of the first power bar is electrically connected to a lead of the plurality of leads with a second bond wire.
14. The semiconductor device of claim 13 , wherein the radial lead segment of the second power bar is electrically connected to a different lead of the plurality of leads.
15. The semiconductor device of claim 13 , wherein the radial lead segment of the second power bar is not connected to any lead of the plurality of leads.
16. The semiconductor device of claim 9 , wherein:
the die paddle has a cut-out region along a side thereof; and
the tangential bar segment of the first lead extends into the cut-out region of the die paddle.
17. A lead frame for a packaged semiconductor device, the lead frame comprising:
a die paddle;
a plurality of leads adjacent to the die paddle;
a plurality of power bars adjacent to the die paddle, wherein:
a first power bar comprises a radial lead segment connected to a tangential bar segment proximal to the die paddle;
the die paddle has a first cut-out region along a first side of the die paddle; and
the tangential bar segment of the first lead extends into the first cut-out region of the die paddle; and
a tape attached to the radial lead segment of the first power bar and at least one of the plurality of leads that is adjacent to the radial lead segment of the first power bar, wherein the radial lead segment of the first power bar is supported by the tape.
18. The lead frame of claim 17 , wherein at least one other tangential bar segment of at least one other power bar extends into the first cut-out region of the die paddle.
19. The lead frame of claim 17 , wherein:
the die paddle has a second cut-out region along a second side of the die paddle; and
at least one other tangential bar segment of at least one other power bar extends into the second cut-out region of the die paddle.