Integrated circuit interconnection technique

• US 5,162,613 A
• Filed: 07/01/1991
• Issued: 11/10/1992
• Est. Priority Date: 07/01/1991
• Status: Expired due to Term

• Current Assignee: American Telephone & Telegraph Company (AT&T, Inc.)
• Original Assignee: AT&T, Inc.
• Inventors: Schoenthaler, David
• Primary Examiner(s): NIMMO, MORRIS
• Application Number:
  US07/724,080
• Time in Patent Office: 498 Days
• Field of Search: 174/88 R, 174/94 R, 174/260, 439/66, 439/91, 29/832, 29/834
• US Class Current: 174/88.00R
• CPC Class Codes: H01L 2224/81801 Soldering or alloying
• CPC Class Codes: H01L 23/49883 the conductive materials containing organic materials or pastes, e.g. for thick films for printed circuits H05K1/092
• CPC Class Codes: H01L 24/81 using a bump connector
• CPC Class Codes: H01L 2924/01029 Copper [Cu]
• CPC Class Codes: H01L 2924/01033 Arsenic [As]
• CPC Class Codes: H01L 2924/01087 Francium [Fr]
• CPC Class Codes: H01L 2924/014 Solder alloys
• CPC Class Codes: H01L 2924/14 Integrated circuits
• CPC Class Codes: H01L 2924/3011 Impedance
• CPC Class Codes: H01R 13/2414 conductive elastomers
• CPC Class Codes: H05K 13/046 Surface mounting surface mounted components H05K3/341
• CPC Class Codes: H05K 2201/0314 Elastomeric connector or conductor, e.g. rubber with metallic filler elastomeric dielectric H05K2201/0133
• CPC Class Codes: H05K 2201/10674 Flip chip
• CPC Class Codes: H05K 3/305 Affixing by adhesive
• CPC Class Codes: H05K 3/325 by abutting or pinching, i.e. without alloying process; mechanical auxiliary parts therefor adaptations of leads inserted in holes for press-fit connections H05K3/308
• CPC Class Codes: H05K 7/1425 of standardised dimensions, e.g. 19"-subrack
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.

Abstract

Interconnection of each of a plurality of bond sites (14) on a semiconductor chip (10) to a corresponding one of a plurality of metallized areas (16) on a substrate (12) is accomplished via a sheet of anisotropically conductive material (18) sandwiched therebetween. The anisotropically conductive material advantageously has a cutout (24) therein located to expose at least a portion of the substrate lying between a pair of metallized areas (16). The cutout (24) serves to confine a quantity of adhesive (26) deposited therein which serves to secure the chip to the substrate without any physical bond between the metallized areas and the bond sites on the chip while maintaining the anisotropically conductive material in compression.

Claims

1. A method for interconnecting each of a plurality of conductive members on a component to a corresponding one of a plurality of metallized areas on a substrate comprising the steps of:

placing a non-adhering sheet of anisotropically conductive material, having at least one cutout therein, onto a substrate such that the cutout exposes a portion of the substrate lying between a pair of metallized areas;

filling the cutout in the anisotropically conductive material with an adhesive; and

placing a component, having at least one conductive member, onto the anisotropically conductive material such that each conductive member is in aligned registration with a corresponding metallized area and that at least a portion of the component is adhered to the substrate by the adhesive to maintain the anisotropically conductive material in compression.

2. The method according to claim 1 wherein the anisotropically conductive material has a single cutout therein and is placed on the substrate such that the cutout is located centrally with respect to the metallized areas.

3. The method according to claim 1 wherein the component may be removed from the substrate without damage to any of the metallized areas thereon by shearing the adhesive bond between the component and the substrate.

4. An assembly fabricated by the steps of:

placing a non-adhering sheet of anisotropically conductive material, having at least one cutout therein, onto a substrate such that the cutout exposes a portion of the substrate lying between a pair of metallized areas on the substrate;

filling the cutout in the anisotropically conductive material with an adhesive; and

placing a component having at least a pair of conductive members onto the anisotropically conductive material such that each conductive member is in aligned registration with a corresponding metallized area on the substrate and that at least a portion of the component is adhered to the substrate by the adhesive to maintain the anisotropically conductive material in compression.

5. The assembly according to claim 4 wherein the anisotropically conductive material has a single cutout therein and is placed on the substrate such that the cutout is located centrally with respect to the metallized areas.

6. The assembly according to claim 4 wherein the component is removable from the substrate without damage to any of the metallized areas thereon by shearing the adhesive bond between the component and the substrate.

7. An assembly comprising:

a substrate having a plurality of metallized areas on a first major surface thereof arranged in a predetermined pattern;

a sheet of anisotropically conductive material overlying the first major surface of the substrate, the material having at least one cutout therein for exposing a portion of the substrate lying between a pair of metallized areas on the first surface thereof;

a quantity of adhesive deposited within the cutout within the anisotropically conductive material;

at least one component having a plurality of conductive members, the component overlying at least a portion of the cutout in the conductive material so as to be in contact with the adhesive, and the component being positioned such that each conductive member thereof is in aligned registration with a corresponding metallized area on the substrate, the component being secured to the substrate by the adhesive so as to maintain the anisotropically conductive material in compression.

8. The assembly according to claim 7 wherein the adhesive comprises a thermoset adhesive.

9. The assembly according to claim 7 wherein the component comprises an unpackaged semiconductor chip.