Stacked semiconductor package including a smaller-area semiconductor chip

1. A semiconductor package comprising:

a base substrate;

a first semiconductor chip unit attached to the base substrate and including at least one first semiconductor chip;

a second semiconductor chip unit stacked on the first semiconductor chip unit and including at least one second semiconductor chip;

at least one third semiconductor chip disposed between the first semiconductor chip unit and the second semiconductor chip unit, the at least one third semiconductor chip having an area smaller than that of the at least one first semiconductor chip and that of the at least one second semiconductor chip and having a pad;

an insulating material layer disposed between the first semiconductor chip unit and the second semiconductor chip unit to surround at least a portion of the at least one third semiconductor chip and having a thickness larger than that of the third semiconductor chip;

a rewiring line pattern formed on an upper surface of the at least one first semiconductor chip closest to the insulating material layer and formed under the insulating material layer;

an auxiliary bonding wire connecting the pad of the at least one third semiconductor chip to the rewiring line pattern; and

a bonding wire connecting the rewiring line pattern to the base substrate.

2. The semiconductor package of claim 1 ,

wherein the insulating material layer has substantially the same area as that of a second semiconductor chip of the second semiconductor chip unit that is closest to the insulating material layer.

3. The semiconductor package of claim 2 ,

wherein edges of the insulating material layer and the second semiconductor chip closest to the insulating material layer coincide with each other in a direction perpendicular to the base substrate.

4. The semiconductor package of claim 1 ,

wherein the at least one first semiconductor chip comprises a plurality of first semiconductor chips stacked so that upper surfaces of the first semiconductor chips are at least partially exposed.

5. The semiconductor package of claim 4 ,

wherein the at least one second semiconductor chip comprises a plurality of second semiconductor chips stacked so that upper surfaces thereof are at least partially exposed and shifted in a direction different from that of the first semiconductor chips.

6. The semiconductor package of claim 5 ,

wherein the second semiconductor chips are stacked on the base substrate by die adhesive films attached to respective lower surfaces; and

the thickness of the insulating material layer is larger than that of the die adhesive film.

7. The semiconductor package of claim 5 ,

wherein edges of first and second semiconductor chips closest to the insulating material layer coincide with each other in a direction perpendicular to the base substrate.

8. The semiconductor package of claim 1 , wherein:

the first semiconductor chips are vertically aligned; and

the second semiconductor chips are horizontally offset.

9. The semiconductor package of claim 1 , wherein the at least one third semiconductor chip is electrically connected to the first semiconductor chip through the rewiring line pattern.

10. The semiconductor package of claim 1 ,

wherein the at least one third semiconductor chip is electrically connected to the rewiring line pattern by a flip-chip method using bumps or a wire bonding method using a bonding wire.

11. The semiconductor package of claim 1 , wherein both upper and side surfaces of the at least one third semiconductor chip are surrounded by the insulating material layer.

12. The semiconductor package of claim 1 , wherein the at least one third semiconductor chip protrudes from a side surface of the insulating material layer and so that a side surface of the at least one third semiconductor chip is exposed.

13. The semiconductor package of claim 1 , wherein:

the at least one third semiconductor chip comprises a plurality of third semiconductor chips; and

for each of the third semiconductor chips, the insulating material layer surrounds at least a portion of the third semiconductor chip.

14. The semiconductor package of claim 1 ,

wherein an area of the at least one first semiconductor chip is different from an area of the at least one second semiconductor chip.

15. The semiconductor package of claim 1 , wherein:

the base substrate includes a plurality of first pads, a plurality of second pads, and a plurality of third pads;

the first pads are electrically connected to the first semiconductor chip unit;

the second pads are electrically connected to the second semiconductor chip unit;

the third pads are electrically connected to the at least one third semiconductor chip; and

the third pads are disposed on a side of the first semiconductor chip unit different from that of the first and second pads.