US5087962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated lead frame using plasma sprayed dielectric
Assignee: Motorola Solutions Inc
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Filing: 1991-02-25
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Granted: 1992-02-11
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Expires: 2011-02-25
Abstract
Abstract An electrically insulated lead frame having high thermal conductivity is achieved by utilizing a plasma spraying technique to apply a thin layer of a dielectric material on a surface of a lead frame. The lead frame is subsequently employed as a part of an insulated semiconductor device package.
Inventors
- 👤 James W. G. deVos
- 👤 Denise M. Ommen
- 👤 Robert H. Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:24
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/40; H10W70/456; H10W70/458; H10W74/00; H10W90/00; H10W90/701; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
An insulated lead frame for a semiconductor package which comprises: a die attach area on a first surface of a semiconductor device lead frame; a plurality of leads projecting outward from the die attach area wherein the plurality of leads have proximal lead ends near the die attach area; and a layer of plasma spray ceramic material that is less than approximately 125 microns thick on a second surface of the lead frame wherein the layer of plasma sprayed ceramic material covers at least a portion of the plurality of proximal lead ends and an area that is opposite the die attach area.
Claim 2
Dependent Claim
103 words
An insulated lead frame for a semiconductor package which comprises: a die attach area on a first surface of a semiconductor device lead frame; a plurality of leads projecting outward from the die attach area wherein the plurality of leads have proximal lead ends near the die attach area; and a layer of plasma spray ceramic material that is less than approximately 125 microns thick on a second surface of the lead frame wherein the layer of plasma sprayed ceramic material covers at least a portion of the plurality of proximal lead ends and an area that is opposite the die attach area.
Claim 3
Dependent Claim
27 words
The insulated lead frame of claim 1 wherein the plasma sprayed ceramic material includes a plasma sprayed aluminum oxide (Al 2 O 3 ) filled ceramic material.
Claim 4
Dependent Claim
19 words
The insulated lead frame of claim 1 further including a thin metallic layer on the plasma sprayed ceramic material.
Claim 5
Dependent Claim
115 words
An electrically insulated semiconductor device package which comprises: a lead frame for a semiconductor device package wherein the lead frame has a die attach area on a first surface of the lead frame and a plurality of leads extending outward from the die attach area; a layer of a plasma sprayed aluminum oxide (Al 2 O 3 ) filled ceramic material that is less than approximately 125 microns thick between a second surface of the lead frame and a heatsink wherein the ceramic material insulates a portion of the lead frame; and a body of the package wherein the body covers at least the die attach area and a portion of the plurality of leads.
Claim 6
Dependent Claim
115 words
An electrically insulated semiconductor device package which comprises: a lead frame for a semiconductor device package wherein the lead frame has a die attach area on a first surface of the lead frame and a plurality of leads extending outward from the die attach area; a layer of a plasma sprayed aluminum oxide (Al 2 O 3 ) filled ceramic material that is less than approximately 125 microns thick between a second surface of the lead frame and a heatsink wherein the ceramic material insulates a portion of the lead frame; and a body of the package wherein the body covers at least the die attach area and a portion of the plurality of leads.
References Cited (Backward Citations)
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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) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |