Shielding for a semiconductor package
View Patent ↗A semiconductor device has a substrate. A first die is electrically attached to a first surface of the substrate. A shield spacer having a first and second surface is provided wherein the second surface of the shield spacer is attached to a first surface of the first die. A plurality of wirebonds are attached to the shield spacer and to the substrate. A mold compound is provided for encapsulating the first die, the shield spacer, and the wirebonds.
1. A semiconductor device comprising:
a substrate;
a first die electrically attached to a first surface of the substrate;
a shield spacer having a first and second surface, the second surface of the shield spacer attached to a first surface of the first die;
a plurality of wirebonds attached to the shield spacer and to the substrate; and
a mold compound for encapsulating the first die, the shield spacer and the wirebonds;
a conductive coating applied to the mold compound;
wherein the plurality of wirebonds attached to the shield spacer and to the substrate form a loop, a portion of the loop exposed and contacting the conductive coating.
2. A semiconductor device in accordance with claim 1 wherein the plurality of wirebonds are positioned around an outer perimeter of the first die.
3. A semiconductor device in accordance with claim 1 further comprising:
a shield spacer adhesive layer attached to the second surface of the shield spacer and to a first surface of the first die; and
at least one first die wirebond to electrically couple the first die to the substrate;
wherein a height of the shield spacer adhesive layer is greater than a loop height of the at least one first die wirebond.
4. A semiconductor device in accordance with claim 1 further comprising:
a second die attached to the first surface of the shield spacer; and
at least one second die wirebond to electrically couple the second die to the substrate.
5. A semiconductor device in accordance with claim 4 further comprising:
a second die adhesive layer attached to the first surface of the shield spacer and to the second die;
wherein a height of the second adhesive layer is greater than a loop height of the at least one second die wirebond.
6. A semiconductor device in accordance with claim 1 wherein the plurality of wirebonds are attached to grounded metal traces formed on the substrate.
7. A semiconductor device in accordance with claim 1 wherein the first die is a flip chip.
8. A semiconductor device in accordance with claim 7 further comprising a shield spacer adhesive layer attached to the second surface of the shield spacer and to a first surface of the first die.
9. A semiconductor device in accordance with claim 7 further comprising:
a second die attached to the first surface of the shield spacer; and
at least one second die wirebond to electrically couple the second die to the substrate.
10. A semiconductor device in accordance with claim 9 further comprising:
a second die adhesive layer attached to the first surface of the shield spacer and to the second die;
wherein a height of the second adhesive layer is greater than a loop height of the at least one second die wirebond.
11. A semiconductor device in accordance with claim 1 further comprising:
a second die attached to the first surface of the shield spacer; and
at least one second die wirebond to electrically couple the second die to the substrate.
12. A semiconductor device in accordance with claim 1 further comprising:
a second die attached to the first surface of the shield spacer;
at least one second die wirebond to electrically couple the second die to the substrate;
a second shield spacer having a first and second surface, the second surface of the shield spacer attached to a first surface of the second die; and
a plurality of second shield spacer wirebonds attached to the second shield spacer and to the substrate and forming a loop, a portion of the loop exposed and contacting the conductive coating.
13. A semiconductor device in accordance with claim 1 further comprising:
a second die attached to the first surface of the shield spacer;
at least one second die wirebond to electrically couple the second die to the substrate;
a second shield spacer having a first and second surface, the second surface of the shield spacer attached to a first surface of the second die; and
a first plurality of second shield spacer wirebonds attached to the second shield spacer and to the substrate and forming a first shield; and
a second plurality of second shield spacer wirebonds attached to the second shield spacer and to the substrate and forming a second shield.
14. A semiconductor device comprising:
a substrate;
a first die electrically attached to a first surface of the substrate;
a shield spacer having a first and second surface, the second surface of the shield spacer attached to a first surface of the first die;
means attached to the shield spacer and to the substrate to form a RF shield;
a mold compound for encapsulating the first die, the shield spacer and the means for forming the RF shield; and
a conductive coating applied to the mold compound;
wherein the means attached to the shield spacer and to the substrate form a loop, a portion of the loop exposed and contacting the conductive coating.
15. A semiconductor device in accordance with claim 14 wherein the means are positioned around an outer perimeter of the first die to form the RF shield around the first die.
16. A semiconductor device in accordance with claim 14 further comprising:
a second die attached to the first surface of the shield spacer; and
at least one second die wirebond to electrically couple the second die to the substrate.
17. A semiconductor device in accordance with claim 14 wherein the means are attached to grounded metal traces formed on the substrate.
18. A semiconductor device in accordance with claim 14 further comprising:
a second die attached to the first surface of the shield spacer; and
at least one second die wirebond to electrically couple the second die to the substrate.
19. A semiconductor device in accordance with claim 14 further comprising:
a second die attached to the first surface of the shield spacer;
at least one second die wirebond to electrically couple the second die to the substrate;
a second shield spacer having a first and second surface, the second surface of the shield spacer attached to a first surface of the second die; and
a plurality of second shield spacer wirebonds attached to the second shield spacer and to the substrate and forming a loop, a portion of the loop exposed and contacting the conductive coating.
20. A semiconductor device comprising:
a substrate;
a first die electrically attached to a first surface of the substrate;
a shield spacer having a first and second surface, the second surface of the shield spacer attached to a first surface of the first die;
means attached to the shield spacer and to the substrate to form an RF shield;
a mold compound for encapsulating the first die, the shield spacer and the means attached to the shield spacer and to the substrate; and
a conductive coating applied to the mold compound;
wherein the means attached to the shield spacer and to the substrate form a loop, a portion of the loop exposed and contacting the conductive coating.
21. A semiconductor device in accordance with claim 20 further comprising:
a second die attached to the first surface of the shield spacer;
at least one second die wirebond to electrically couple the second die to the substrate;
a second shield spacer having a first and second surface, the second surface of the shield spacer attached to a first surface of the second die; and
a first plurality of second shield spacer wirebonds attached to the second shield spacer and to the substrate and forming a first shield; and
a second plurality of second shield spacer wirebonds attached to the second shield spacer and to the substrate and forming a second shield.