Lead frame based semiconductor device with routing substrate
A semiconductor device including a lead frame, a routing substrate disposed within the lead frame, and an active component mounted on the routing substrate. The active component has a plurality of die pads. The routing substrate includes a set of first bond pads, a set of second bond pads, and interconnections, where each interconnection provides an electrical connection between a first bond pad and a corresponding second bond pad. The semiconductor device further includes electrical couplings between one or more of die pads of the active component and corresponding first bond pads of the routing substrate, as well as electrical couplings between leads of the lead frame and respective second bond pads of the routing substrate.
1. A semiconductor device comprising:
a lead frame comprising a plurality of leads;
a routing substrate disposed within the lead frame and comprising a set of first bond pads, a set of second bond pads, and a plurality of interconnections, each interconnection providing an electrical connection between a first bond pad and a corresponding second bond pad;
an active component mounted on the routing substrate and having a plurality of die pads;
electrical couplings between one or more die pads of the active component and corresponding first bond pads of the routing substrate; and
electrical couplings between one or more leads of the lead frame and corresponding second bond pads of the routing substrate.
2. The semiconductor device of claim 1 , wherein:
the arrangement of the first bond pads is dependent on the arrangement of the die pads on the active component and independent of the arrangement of the leads on the lead frame; and
the arrangement of the second bond pads is dependent on the arrangement of the leads on the lead frame and independent of the arrangement of the die pads on the active component.
3. The semiconductor device of claim 2 , wherein:
the arrangement of the first bond pads being dependent on the arrangement of the die pads on the active component means that a pattern defined by the first bond pads is similar to a pattern defined by the die pads on the active component;
the arrangement of the first bond pads being independent of the arrangement of the leads on the lead frame means that a pattern defined by the first bond pads is dissimilar from a pattern defined by the arrangement of the leads on the lead frame;
the arrangement of the second bond pads being dependent on the arrangement of the leads on the lead frame means that a pattern defined by the second bond pads is similar to a pattern defined by the arrangement of the leads on the lead frame; and
the arrangement of the second bond pads being independent of the arrangement of the die pads on the active component means that a pattern defined by the second bond pads is dissimilar from a pattern defined by the die pads on the active component.
4. The semiconductor device of claim 1 , wherein:
the die pads on the active component are arranged in two parallel rows along opposing edges of the active component;
the lead frame is a square lead frame having four sides, with the leads of the lead frame arranged in four rows, each row disposed along one of the four sides of the lead frame;
the second bond pads are arranged in a square formation; and
the first bond pads are arranged in two parallel rows, within the square formed by the second bond pads.
5. The semiconductor device of claim 1 , wherein:
the set of first bond pads is an inner set of bond pads; and
the set of second bond pads is an outer set of bond pads.
6. The semiconductor device of claim 5 , wherein:
the set of second bond pads defines a polyhedron within which all of the bond pads in the set of first bond pads are disposed.
7. The semiconductor device of claim 1 , wherein:
the average distance between bond pads in the set of first bond pads is less than the average distance between bond pads in the set of second bond pads.
8. The semiconductor device of claim 1 , wherein:
the set of first bond pads comprises two or more subsets of similarly-spaced first bond pads; and
the set of second bond pads comprises two or more subsets of similarly-spaced second bond pads.
9. The semiconductor device of claim 1 , wherein:
the bond pads on the routing substrate are spaced so as to avoid interference between nearby or adjacent electrical couplings.
10. The semiconductor device of claim 1 , wherein the lead frame is a quad flat no lead (QFN) lead frame.
11. The semiconductor device of claim 1 , wherein the routing substrate has an exposed die pad formed within a portion thereof.
12. The semiconductor device of claim 11 , wherein the exposed die pad is formed centrally within the routing substrate.
13. The semiconductor device of claim 1 , wherein the active component is an integrated circuit die.
14. A method for assembling a semiconductor device, the method comprising:
(a) mounting, on a routing substrate, an active component having a plurality of die pads, wherein the routing substrate comprises a set of first bond pads, a set of second bond pads, and a plurality of interconnections, each interconnection providing an electrical connection between a first bond pad and a corresponding second bond pad;
(b) disposing the active component and routing substrate within a lead frame comprising a plurality of leads;
(c) electrically coupling one or more die pads of the active component to corresponding first bond pads of the routing substrate; and
(d) electrically coupling one or more leads of the lead frame to corresponding second bond pads of the routing substrate.
15. The method of claim 14 , wherein:
the arrangement of the first bond pads is dependent on the arrangement of the die pads on the active component and independent of the arrangement of the leads on the lead frame; and
the arrangement of the second bond pads is dependent on the arrangement of the leads on the lead frame and independent of the arrangement of the die pads on the active component.
16. The method of claim 15 , wherein:
the arrangement of the first bond pads being dependent on the arrangement of the die pads on the active component means that a pattern defined by the first bond pads is similar to a pattern defined by the die pads on the active component;
the arrangement of the first bond pads being independent of the arrangement of the leads on the lead frame means that a pattern defined by the first bond pads is dissimilar from a pattern defined by the arrangement of the leads on the lead frame;
the arrangement of the second bond pads being dependent on the arrangement of the leads on the lead frame means that a pattern defined by the second bond pads is similar to a pattern defined by the arrangement of the leads on the lead frame; and
the arrangement of the second bond pads being independent of the arrangement of the die pads on the active component means that a pattern defined by the second bond pads is dissimilar from a pattern defined by the die pads on the active component.
17. The method of claim 14 , wherein:
the set of first bond pads is an inner set of bond pads;
the set of second bond pads is an outer set of bond pads; and
the set of second bond pads defines a polyhedron within which all of the bond pads in the set of first bond pads are disposed.
18. The method of claim 14 , wherein:
the average distance between bond pads in the set of first bond pads is less than the average distance between bond pads in the set of second bond pads.
19. The method of claim 14 , wherein:
the set of first bond pads comprises two or more subsets of similarly-spaced first bond pads; and
the set of second bond pads comprises two or more subsets of similarly-spaced second bond pads.
20. The method of claim 14 , wherein the bond pads on the routing substrate are spaced to avoid interference between nearby or adjacent electrical couplings.