BGA package using PCB and tape in a die-up configuration

• US 6,069,407 A
• Filed: 11/18/1998
• Issued: 05/30/2000
• Est. Priority Date: 11/18/1998
• Status: Expired due to Fees

• Current Assignee: VLSI Technology, Inc. (Koninklijke Philips N.V.)
• Original Assignee: VLSI Technology, Inc. (Koninklijke Philips N.V.)
• Inventors: Hamzehdoost, Ahmad
• Primary Examiner(s): Chaudhuri, Olik
• Assistant Examiner(s): Chambliss, Alonzo
• Application Number:
  US09/195,349
• Time in Patent Office: 559 Days
• Field of Search: 257/703, 257/704, 257/737, 257/738, 257/774, 257/668, 257/686, 257/783, 257/700, 257/701, 361/718, 361/720, 361/764, 361/767, 361/803
• US Class Current: 257/774
• CPC Class Codes: H01L 2224/05599 Material
• CPC Class Codes: H01L 2224/45015 being circular
• CPC Class Codes: H01L 2224/45099 Material
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2224/85399 Material
• CPC Class Codes: H01L 23/3128 the substrate having spherical bumps for external connection
• CPC Class Codes: H01L 23/49833 the chip support structure consisting of a plurality of insulating substrates
• CPC Class Codes: H01L 24/48 of an individual wire connector
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/14 Integrated circuits
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 2924/207 Diameter ranges
• CPC Class Codes: H05K 2201/0305 Solder used for other purposes than connections between PCB or components, e.g. for filling vias or for programmable patterns
• CPC Class Codes: H05K 2201/10666 Plated through-hole for surface mounting on PCB
• CPC Class Codes: H05K 3/3436 having an array of bottom contacts, e.g. pad grid array or ball grid array components
• CPC Class Codes: H05K 3/4046 using auxiliary conductive elements, e.g. metallic spheres, eyelets, pieces of wire
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product

Abstract

A die-up configuration includes a rigid circuit board with electrically conductive plated-through holes formed therethrough and an integrated-circuit die mounted to the upper surface of which a flexible insulated tape layer is fixed to the upper surface of a rigid circuit board and which has a number of wire-bonding sites. Conductive vias or plated-through holes are provided for connecting the wire-bonding sites on the upper surface of the flexible insulated tape layer to the contact areas formed on the lower surface of the flexible insulated tape layer. Conductors are provided for connecting respective contact areas on the lower surface of the flexible insulated tape layer to solder balls on the bottom of the rigid circuit board.

Claims

1. A die-up BGA package for an integrated-circuit die, comprising:

a rigid circuit board having a top surface, a bottom surface, and a plurality of electrical conductors formed therethrough between the top surface and the bottom surface of the rigid circuit board, wherein said electrical conductors each have circuit-board contact areas at the top surface of the rigid circuit board;

a flexible insulated tape layer having an upper surface and a lower surface, wherein the lower surface of the flexible insulated tape layer is fixed to the top surface of the rigid circuit board, wherein the upper surface of the flexible insulated tape layer has a number of wire-bonding sites formed thereon, and wherein the lower surface of the flexible insulated tape layer has a number of tape-layer contact areas formed thereon;

an integrated-circuit die having a pair of opposing surfaces, one of which surfaces is a die-mounting surface and the other surface of which has wire-bonding pads formed thereupon, wherein the die-mounting surface of the integrated-circuit side is mounted to the upper surface of the flexible insulated tape layer;

means for electrically connecting the wire-bonding sites on the upper surface of the flexible insulated tape layer to respective tape-layer contact areas formed on the lower surface of the flexible insulated tape layer;

a plurality of bonding-wire loops, each of which has one end bonded to one of the wire-bonding pads formed on the integrated-circuit die and the other end bonded to a respective one of the wire-bonding sites on the upper surface of the flexible insulated tape layer;

means for connecting respective tape-layer contact areas on the lower surface of the flexible insulated tape layer to the circuit-board contact areas of the electrical conductors at the top surface of the rigid circuit board;

a plurality of solder balls connected to the lower surface of the rigid circuit board and to the conductors formed through the rigid circuit board; and

sealing means for covering and sealing the integrated-circuit die and the bonding wires.

2. The package of claim 1 wherein the means for connecting the wire-bonding sites on the upper surface of the flexible insulated tape layer to the tape-layer contact areas formed on the lower surface of the flexible insulated tape layer include conductive vias formed through the flexible insulated layer, filled with conductive material, and also connected to conductive traces formed on the upper surface of the flexible insulated tape layer for connection to the wire bonding sites.

3. The package of claim 1 wherein the means for connecting the wire-bonding sites on the upper surface of the flexible insulated tape layer to the tape-layer contact areas formed on the lower surface of the flexible insulated tape layer include plated through holes formed through the flexible insulated layer and connected to conductive traces formed on the upper surface of the flexible insulated tape layer for connection to the wire bonding sites.

4. The package of claim 1 wherein the electrical conductors formed through the rigid circuit board include vias filled with conductive material.

5. The package of claim 4 wherein the means for connecting respective tape-layer contact areas on the lower surface of the flexible insulated tape layer to the circuit-board contact areas at the top surface of the rigid circuit board include the conductive material in the vias in the rigid circuit board making contact with respective tape-layer contact areas on the lower surface of the flexible insulated tape layer through a layer of conductive adhesive material.

6. The package of claim 1 wherein the electrical conductors formed through the rigid circuit board include plated-through holes.

7. The package of claim 6 wherein the means for connecting respective tape-layer contact areas on the lower surface of the flexible insulated tape layer to the circuit-board contact areas at the top surface of the rigid circuit board include the top surfaces of the plated-through holes.

8. The package of claim 1 wherein the solder balls connected to the lower surface of the rigid circuit board are arranged in a grid pattern on the bottom side of the die-up BGA package.

9. The package of claim 1 wherein the rigid circuit board is an epoxy printed-circuit board.

10. The package of claim 1 wherein the rigid circuit board is a ceramic circuit board.

11. The package of claim 1 wherein the sealing means includes an encapsulation layer covering the integrated-circuit die and the bonding wires.

12. A die-up BGA package for an integrated-circuit die, comprising:

a rigid circuit board having a top surface, a bottom surface, and a plurality of electrical conductors formed therethrough between the top surface and the bottom surface of the rigid circuit board, wherein said electrical conductors each have a circuit-board contact area at the top surface of the rigid circuit board;

a flexible insulated tape layer having an upper surface and a lower surface, wherein the lower surface of the flexible insulated tape layer is fixed to the top surface of the rigid circuit board, wherein the upper surface of the flexible insulated tape layer has a number of wire-bonding sites formed thereon, and wherein the lower surface of the flexible insulated tape layer has a number of tape-layer contact areas formed thereon;

an integrated-circuit die having a pair of opposing surfaces, one of which surfaces is a die-mounting surface and the other surface of which has wire-bonding pads formed thereupon, wherein the die-mounting surface of the integrated-circuit side is mounted to the upper surface of the flexible insulated tape layer;

means for electrically connecting the wire-bonding sites on the upper surface of the flexible insulated tape layer to the tape-layer contact areas formed on the lower surface of the flexible insulated tape layer, wherein said means include conductive vias formed through the flexible insulated layer, filled with conductive material, and also connected to conductive traces formed on the upper surface of the flexible insulated tape layer for connection to the wire bonding;

a plurality of bonding-wire loops, each of which has one end bonded to one of the wire-bonding pads formed on the integrated-circuit die and the other end bonded to a respective one of the wire-bonding sites on the upper surface of the flexible insulated tape layer;

means for connecting respective tape-layer contact areas on the lower surface of the flexible insulated tape layer to the circuit-board contact areas at the top surface of the rigid circuit board;

a plurality of solder balls connected to the lower surface of rigid circuit board and to the conductors formed through the rigid circuit board; and

sealing means for covering and sealing the integrated-circuit die, the bonding wires.

13. The package of claim 12 wherein the electrical conductors formed through the rigid circuit board include vias filled with conductive material.

14. The package of claim 13 wherein the means for connecting respective tape-layer contact areas on the lower surface of the flexible insulated tape layer to the circuit-board contact areas at the top surface of the rigid circuit board include the conductive material in the vias in the rigid circuit board making contact with respective tape-layer contact areas on the lower surface of the flexible insulated tape layer.

15. The package of claim 12 wherein the electrical conductors formed through the rigid circuit board include plated-through holes.

16. The package of claim 15 wherein the means for connecting respective tape-layer contact areas on the lower surface of the flexible insulated tape layer to the circuit-board contact areas at the top surface of the rigid circuit board include the top surfaces of the plated-through holes.

17. A die-up BGA package for an integrated-circuit die, comprising:

a rigid circuit board having a top surface, a bottom surface, and a plurality of electrical conductors formed therethrough between the top surface and the bottom surface of the rigid circuit board, wherein said electrical conductors each have a circuit-board contact area at the top surface of the rigid circuit board;

a flexible insulated tape layer having an upper surface and a lower surface, wherein the lower surface of the flexible insulated tape layer is fixed to the top surface of the rigid circuit board, wherein the upper surface of the flexible insulated tape layer has a number of wire-bonding sites formed thereon, and wherein the lower surface of the flexible insulated tape layer has a number of tape-layer contact areas formed thereon;

an integrated-circuit die having a pair of opposing surfaces, one of which surfaces is a die-mounting surface and the other surface of which has wire-bonding pads formed thereupon, wherein the die-mounting surface of the integrated-circuit side is mounted to the upper surface of the flexible insulated tape layer;

means for electrically connecting the wire-bonding sites on the upper surface of the flexible insulated tape layer to the tape-layer contact areas formed on the lower surface of the flexible insulated tape layer, wherein said means include plated through holes formed through the flexible insulated layer and connected to conductive traces formed on the upper surface of the flexible insulated tape layer for connection to the wire bonding sites;

a plurality of bonding-wire loops, each of which has one end bonded to one of the wire-bonding pads formed on the integrated-circuit die and the other end bonded to a respective one of the wire-bonding sites on the upper surface of the flexible insulated tape layer;

means for connecting respective tape-layer contact areas on the lower surface of the flexible insulated tape layer to the circuit-board contact areas at the top surface of the rigid circuit board;

a plurality of solder balls connected to the lower surface of rigid circuit board and to the conductors formed through the rigid circuit board; and

sealing means for covering and sealing the integrated-circuit die, the bonding wires.

18. The package of claim 17 wherein the electrical conductors formed through the rigid circuit board include vias filled with conductive material.

19. The package of claim 18 wherein the means for connecting respective tape-layer contact areas on the lower surface of the flexible insulated tape layer to the circuit-board contact areas at the top surface of the rigid circuit board include the conductive material in the vias in the rigid circuit board making contact with respective tape-layer contact areas on the lower surface of the flexible insulated tape layer.

20. The package of claim 17 wherein the electrical conductors formed through the rigid circuit board include plated-through holes.

21. The package of claim 20 wherein the means for connecting respective tape-layer contact areas on the lower surface of the flexible insulated tape layer to the circuit-board contact areas at the top surface of the rigid circuit board include the top surfaces of the plated-through holes.