Patent US5479050A successfully refreshed from Google Patents.
US5479050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leadframe with pedestal
Assignee: Texas Instruments Inc
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Filing: 1994-10-11
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Granted: 1995-12-26
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Expires: 2014-10-11
Abstract
Abstract A raised pedestal is formed on a leadframe die mount pad and is used in forming an electrical connection between the die bond pad and the semiconductor die, the electrical connection being isolated from the shear forces developed during temperature cycling or during thermal shock of the resultant semiconductor device. Such shear forces usually result in destruction of the bond between the semiconductor die and the die bond pad.
Inventors
- 👤 James W. Pritchard
- 👤 Dennis D. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:01
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/40; H10W70/411; H10W72/00; H10W72/50; H10W72/531; H10W72/536; H10W72/5363; H10W72/541; H10W72/5449; H10W72/90; H10W72/931; H10W72/932; H10W90/00; H10W90/701; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
The combination of a semiconductor die and a leadframe having a die mount pad thereon, comprising: a semiconductor die mounted on a metal die mount pad forming part of the leadframe; a self supporting contact area on die mount pad, formed from a part of the die mount pad raised above the semiconductor die; and a wire forming an electrical connection between the semiconductor die and said self supporting contact area on the die mount pad.
Claim 2
Dependent Claim
76 words
The combination of a semiconductor die and a leadframe having a die mount pad thereon, comprising: a semiconductor die mounted on a metal die mount pad forming part of the leadframe; a self supporting contact area on die mount pad, formed from a part of the die mount pad raised above the semiconductor die; and a wire forming an electrical connection between the semiconductor die and said self supporting contact area on the die mount pad.
Claim 3
Dependent Claim
25 words
The combination according to claim 1, wherein the contact area is formed by stamping the contact area from the metal of the die mount pad.
Claim 4
Dependent Claim
21 words
The combination according to claim 2, wherein the contact area forms a pedestal with a contact area on the top thereon.
Claim 5
Dependent Claim
28 words
The combination according to claim 3 wherein the top of the pedestal is raised above one surface of the die mount pad from 0.005 inch to 0.2 inch.
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) | 1998-12-25 | 1999-06-26 | 1999-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-25 | 2003-06-26 | 2003-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-25 | 2007-06-26 | 2007-12-26 | $7700.00 | Window Closed / Lapsed |