US4285003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lower cost semiconductor package with good thermal properties
Assignee: Motorola Solutions Inc
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Filing: 1979-03-19
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Granted: 1981-08-18
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Expires: 1999-03-19
Abstract
Abstract An improved mounting base is disclosed in which a semiconductor die is mounted on a thin pedestal within a large counter bore in the mounting base or header of the transistor package.
Inventors
- 👤 Stanley Gaicki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:50
CPC Classifications
H; H10; H10W; H10W76/00; H10W76/10; H10W76/12; H10W76/13; H10W76/132; H10W70/00; H10W70/20; H10W72/00; H10W72/50; H10W72/531; H10W72/5363; H10W72/541; H10W72/5449; H10W72/90; H10W72/931; H10W72/932; H10W90/00; H10W90/701; H10W90/751; H10W90/753; H10W90/754
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
In a case for semiconductor devices having a mounting base having at least one aperture through which a lead passes, a pedestal to which semiconductor die are attached, and a cap for enclosing said die, the improvement comprising: a thinned region in said base for reducing the thickness of said base in a central area wherein said thinned region is greater than 5 mils (0.13 mm) thickness, said pedestal being 15-60 mils (0.38-1.5 mm) thick and smaller in area than said thinned region and being attached to said base in said central area.
Claim 2
Dependent Claim
93 words
In a case for semiconductor devices having a mounting base having at least one aperture through which a lead passes, a pedestal to which semiconductor die are attached, and a cap for enclosing said die, the improvement comprising: a thinned region in said base for reducing the thickness of said base in a central area wherein said thinned region is greater than 5 mils (0.13 mm) thickness, said pedestal being 15-60 mils (0.38-1.5 mm) thick and smaller in area than said thinned region and being attached to said base in said central area.
Claim 3
Dependent Claim
14 words
The case as set forth in claim 1 wherein said mounting base comprises steel.
Claim 4
Dependent Claim
13 words
The case as set forth in claim 2 wherein said pedestal comprises copper.
Claim 5
Dependent Claim
23 words
The case as set forth in claims 1 or 2 or 3 and further comprising raised annular splash ring surrounding said thinned region.
Claim 6
Dependent Claim
26 words
The case as set forth in claim 4 wherein said cap has an inside diameter greater than the outside diameter of said raised annular splash ring.
Claim 7
Dependent Claim
26 words
The case as set forth in claims 1 or 2 or 3 wherein said at least one aperture for a lead is within said central area.
Claim 8
Dependent Claim
36 words
The case as set forth in claim 6 wherein each aperture for a lead is surrounded by a raised annular ring and said pedestal fits within said thinned region and the annular ring surrounding each aperture.
Claim 9
Dependent Claim
23 words
The case as set forth in claim 7 wherein said pedestal has an area less than half the area of said thinned region.
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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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |