Dual row quad flat no-lead semiconductor package

1. A semiconductor package comprising:

an outer row of outer peripheral leads disposed on an outer periphery of a bottom surface of the semiconductor package; and

an inner row of inner peripheral leads disposed on an inner periphery of the bottom surface of the semiconductor package,

wherein a first inner peripheral lead has (i) a first corner, (ii) a second corner, (iii) a third corner, and (iv) a fourth corner,

wherein the first corner and the second corner of the first inner peripheral lead are nearer the outer row of outer peripheral leads than the third corner and the fourth corner of the first inner peripheral lead, and

wherein the first corner of the first inner peripheral lead has a rounded shape corresponding to a radius of curvature equal to about half a width of the first inner peripheral lead.

2. The semiconductor package of claim 1 , wherein the second corner of the first inner peripheral lead has the rounded shape corresponding to the radius of curvature equal to about half the width of the first inner peripheral lead.

3. The semiconductor package of claim 1 , wherein the first inner peripheral lead has a substantial rectangular shape.

4. The semiconductor package of claim 1 , wherein:

the first inner peripheral lead has the width in a direction parallel to a nearest edge of the bottom surface of the semiconductor package.

5. The semiconductor package of claim 1 , wherein:

a first outer peripheral lead has (i) a first corner, (ii) a second corner, (iii) a third corner, and (iv) a fourth corner;

the first corner and the second corner of the first outer inner peripheral lead are nearer the inner row of inner peripheral leads than the third corner and the fourth corner of the first outer peripheral lead; and

the first corner of the first outer peripheral lead has the rounded shape corresponding to the radius of curvature equal to about half the width of the first inner peripheral lead.

6. The semiconductor package of claim 5 , wherein:

a first distance separates the first outer peripheral lead from the first inner peripheral lead;

a second distance separates the first outer peripheral lead from a second inner peripheral lead; and

the first distance is about same as the second distance.

7. The semiconductor package of claim 5 , wherein:

a first distance separates the first outer peripheral lead from a second outer peripheral lead; and

the first distance is about same as the width of the first inner peripheral lead.

8. The semiconductor package of claim 1 , wherein the semiconductor package is a Quad Flat No-Lead package.

9. A semiconductor package comprising:

an outer row of outer peripheral leads disposed on an outer periphery of a bottom surface of the semiconductor package; and

an inner row of inner peripheral leads disposed on an inner periphery of the bottom surface of the semiconductor package,

wherein each of the inner peripheral leads has a substantially rectangular shape having four corners, and

wherein a first outer peripheral lead is about equidistant from two nearest inner peripheral leads.

10. The semiconductor package of claim 9 , further comprising:

a die paddle located inside the inner periphery on the bottom surface of the semiconductor package; and

a plurality of conductive contacts between the die paddle and the inner periphery of the bottom surface of the semiconductor package, wherein the conductive contacts are electrically connected to conductors on a top surface of the semiconductor package by vias.

11. The semiconductor package of claim 10 , wherein the plurality of conductive contacts comprises a plurality of conductive pads.

12. The semiconductor package of claim 10 , wherein the plurality of conductive contacts comprises a plurality of conductive strips.

13. The semiconductor package of claim 9 , further comprising:

a top surface including (i) outer pads individually corresponding to the outer peripheral leads of the semiconductor package and (ii) inner pads individually corresponding to the inner peripheral leads of the semiconductor package, wherein

the outer pads include corner pads that are adjacent to corners of the semiconductor package,

the outer pads are electrically connected to the outer peripheral leads by outer vias,

the inner pads are electrically connected to the inner peripheral leads by inner vias, and

the corner pads that are adjacent to the corners of the semiconductor package are electrically interconnected with one another.

14. The semiconductor package of claim 9 , wherein:

a first inner peripheral lead has (i) a first corner, (ii) a second corner, (iii) a third corner, and (iv) a fourth corner;

the first corner and the second corner of the first inner peripheral lead are nearer the outer row of outer peripheral leads than the third corner and the fourth corner of the first inner peripheral lead; and

the first corner of the first inner peripheral lead has a rounded shape corresponding to a radius of curvature equal to about half a width of the first inner peripheral lead.

15. The semiconductor package of claim 9 , wherein the semiconductor package is a Quad Flat No-Lead package.

16. A semiconductor package comprising:

a plurality of outer peripheral leads disposed in a first row along an outer periphery of a bottom surface of the semiconductor package;

a plurality of outer pads disposed in a second row along an outer periphery of a top surface of the semiconductor package, wherein each outer pad of the plurality of outer pads is connected to a corresponding outer peripheral lead of the plurality of outer peripheral leads using a corresponding outer via of a plurality of outer vias, wherein a first outer pad of the plurality of outer pads and a second outer pad of the plurality of outer pads are adjacent such that a first corner of the semiconductor package is between the first outer pad and the second outer pad;

a tie-bar that physically and electrically couples the first outer pad and the second outer pad;

a plurality of inner peripheral leads disposed in a third row along an inner periphery of the bottom surface of the semiconductor package; and

a plurality of inner pads disposed in a fourth row along an inner periphery of the to surface of the semiconductor package,

wherein each inner pad of the plurality of inner pads is connected to a corresponding inner peripheral lead of the plurality of inner peripheral leads using a corresponding inner via of a plurality of inner vias,

wherein a first inner peripheral lead has (i) a first corner, (ii) a second corner, (iii) a third corner, and (iv) a fourth corner,

wherein the first corner and the second corner of the first inner peripheral lead are nearer the first row of the plurality of outer peripheral leads than the third corner and the fourth corner of the first inner peripheral lead, and

wherein the first corner of the first inner peripheral lead has a rounded shape corresponding to a radius of curvature equal to about half a width of the first inner peripheral lead.

17. The semiconductor package of claim 16 , wherein:

a third outer pad of the plurality of outer pads and a fourth outer pad of the plurality of outer pads are adjacent such that a second corner of the semiconductor package is between the third outer pad and the fourth outer pad; and

the tie-bar is configured to physically and electrically couple the third outer pad and the fourth outer pad.

18. The semiconductor package of claim 17 , wherein:

the tie bar, the first outer pad, the second outer pad, the third outer pad, and the fourth outer pad are electrically coupled to a power source.

19. The semiconductor package of claim 17 , wherein:

the tie bar, the first outer pad, the second outer pad, the third outer pad, and the fourth outer pad are electrically coupled to a ground.