US4870476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated circuit packaging process and structure
Assignee: Vermont Technical College
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Filing: 1988-10-24
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Granted: 1989-09-26
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Expires: 2008-10-24
Abstract
Abstract The present invention is a method for packaging and protecting an integrated circuit chip on a carrier tape. A carrier tape comprising at least two bonded layers (one layer being made of an electrically conductive material) includes small flat leads in the conductive layer. A carrier bridge or frame of nonconductive material is bonded to one surface of the leads and is connected to a nonconductive layer (or a part of) the tape. The electrical pads of an integrated circuit are bonded to the respective leads of the tape simultaneously. The leads are cut at a predetermined length from the chip and outside of the frame. The lead ends are bent to form a nest. A planar base is adhered to the surface of the chip having the electrical pads. The leads are then bent over the base to secure the base on the tape and provide electrical contact points to the chip. The chip is coated with a suitable material and to provide insulation and encapsulation of the entire packaging structure. At a desired time, the complete chip packaging structure may be removed from the tape by cutting the frame.
Inventors
- 👤 Russell V. Solstad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:32
CPC Classifications
H; H10; H10W; H10W72/00; H10W72/071; H10W95/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
218 words
A reel of flexible carrier tape having a plurality of packaged semiconductor chips mounted thereon, including: a thin, flexible carrier tape having a nonconductive substrate with first and second sides and a plurality of chip bonding areas formed by openings extending through the substrate with chip support extending across the openings and surrounding chip receiving portions of the openings; conductive leads having first and second sides extending across portions of the chip support frames and into the chip receiving portions of the openings; semiconductor chips positioned in the chip receiving portions of the openings and having first sides with electrical contacts bonded to the conductive leads at locations within the chip receiving portions, and second sides; rigid, planar bases having first sides adhesively affixed to the first sides of the semiconductor chips on the first side of the carrier tape, and extending over portions of the support frames surrounding the chip receiving portions of the openings to cover the chip receiving portions, the conductive leads bend around edges of the support frames and bases and over second sides of the bases; and insulating encapsulant on the second side of the carrier tape over the second sides of the semiconductor chips and portions of the support frames surrounding the chip receiving portions of the openings and opposite the bases.
Claim 2
Dependent Claim
218 words
A reel of flexible carrier tape having a plurality of packaged semiconductor chips mounted thereon, including: a thin, flexible carrier tape having a nonconductive substrate with first and second sides and a plurality of chip bonding areas formed by openings extending through the substrate with chip support extending across the openings and surrounding chip receiving portions of the openings; conductive leads having first and second sides extending across portions of the chip support frames and into the chip receiving portions of the openings; semiconductor chips positioned in the chip receiving portions of the openings and having first sides with electrical contacts bonded to the conductive leads at locations within the chip receiving portions, and second sides; rigid, planar bases having first sides adhesively affixed to the first sides of the semiconductor chips on the first side of the carrier tape, and extending over portions of the support frames surrounding the chip receiving portions of the openings to cover the chip receiving portions, the conductive leads bend around edges of the support frames and bases and over second sides of the bases; and insulating encapsulant on the second side of the carrier tape over the second sides of the semiconductor chips and portions of the support frames surrounding the chip receiving portions of the openings and opposite the bases.
Claim 3
Dependent Claim
15 words
The packaging structure as recited in claim 1 wherein the bases are made of polyimide.
Claim 4
Dependent Claim
79 words
The packaging structure as recited in claim 1 wherein each support frame comprises a pair of parallel strips, each strip engaging a surface of the respective leads at a point where the leads fan outward to wider portions, and a pair of cross sections provided between the parallel strips and beyond the leads, the cross sections and the potions of the parallel strips between the cross sections forming the portions of the support frames surrounding the chip receiving areas.
Claim 5
Dependent Claim
16 words
The packaging structure as recited in claim 1 wherein the carrier tape is made of polyimide.
Claim 6
Dependent Claim
13 words
The packaging structure as recited in claim 1 wherein the encapsulant is epoxy.
Claim 7
Dependent Claim
40 words
The packaging structure of claim 1 wherein the first sides of the leads are positioned adjacent the support frames on the first side of the carrier tape and the semiconductor chips are bonded to the first sides of the leads.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |