US4350618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thick film conductors for use in microelectronic packaging
Assignee: National Starch and Chemical Investment Holding Corp
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Filing: 1979-11-16
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Granted: 1982-09-21
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Expires: 1999-11-16
Abstract
Abstract In a microelectronic package of the type where Si-based integrated circuits are eutectically attached to a Pd/Au-based thick film conductor, a method of reducing the potential for thermal runaway is taught. The method involves increasing the surface area of the Pd to lower the Vbe rating. This reduces the potential for thermal runaway in subsequent integrated circuit operation. It has also been found that increasing the particle size of the Au component further decreases the Vbe rating.
Inventors
- 👤 David G. Hilson
- 👤 Gary W. Johnson
- 👤 Ronald J. Schoonejongen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:13
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/60; H10W70/62; H10W70/66; H10W70/666; H01; H01B; H01B1/00; H01B1/14; H01B1/16; H10D; H10D86/00; H10D86/80; H10D86/85; H10W70/01; H10W70/05; H10W70/098; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
A thick film conductor suitable for use in association with Si-based integrated circuits in a eutectic die attachment process, said thick film conductor comprising by weight, about 87.88% Au, 1.41% Pd, 0.43% Pt, 1.41% ZnO and the remainder being Bi 2 O 3 and glass frit in a ratio of about 2 to 1, said Pd having a surface area of at least about five meters 2 /gram.
Claim 2
Dependent Claim
68 words
A thick film conductor suitable for use in association with Si-based integrated circuits in a eutectic die attachment process, said thick film conductor comprising by weight, about 87.88% Au, 1.41% Pd, 0.43% Pt, 1.41% ZnO and the remainder being Bi 2 O 3 and glass frit in a ratio of about 2 to 1, said Pd having a surface area of at least about five meters 2 /gram.
Claim 3
Dependent Claim
21 words
A thick film conductor in accordance with claim 1 wherein said Pd has a surface area of 5.2 meters 2 /gram.
Claim 4
Dependent Claim
21 words
A thick film conductor in accordance with claim 1 wherein said Pd has a surface area of 25 meters 2 /gram.
Claim 5
Dependent Claim
62 words
A thick film conductor suitable for use in association with Si-based integrated circuits in a eutectic die attachment process, said thick film conductor comprising by weight, about 87.88% Au, 1.41% Pd, 0.43% Pt, 1.41% ZnO, and the remainder being Bi 2 O 3 and glass frit in a ratio of about 2 to 1, said Au having a particle size of 1.96μ.
Claim 6
Dependent Claim
62 words
A thick film conductor suitable for use in association with Si-based integrated circuits in a eutectic die attachment process, said thick film conductor comprising by weight, about 87.88% Au, 1.41% Pd, 0.43% Pt, 1.41% ZnO, and the remainder being Bi 2 O 3 and glass frit in a ratio of about 2 to 1, said Au having a particle size of 1.96μ.
Claim 7
Dependent Claim
63 words
A thick film conductor suitable for use in association with Si-based integrated circuits in a eutectic die attachment process, said thick film conductor comprising by weight about 87.88% Au, 1.41% Pd, 0.43% Pt, 1.41% ZnO and the remainder being Bi 2 O 3 and glass frit in a ratio of about 2 to 1, said Au having a particle size of about 4.4μ.
Claim 8
Dependent Claim
63 words
A thick film conductor suitable for use in association with Si-based integrated circuits in a eutectic die attachment process, said thick film conductor comprising by weight about 87.88% Au, 1.41% Pd, 0.43% Pt, 1.41% ZnO and the remainder being Bi 2 O 3 and glass frit in a ratio of about 2 to 1, said Au having a particle size of about 4.4μ.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |