US5444602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
An electronic package that has a die coupled to a lead frame by a dielectric tape and a heat sink that providees both an electrical and a thermal path between the die and teh lead frame
Assignee: Micron Technology Inc
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Filing: 1994-02-25
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Granted: 1995-08-22
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Expires: 2014-02-25
Abstract
Abstract An electronic package which has a heat sink that is attached to the lead frame of the package with a material that is both electrically and thermally conductive. The lead frame is also coupled to a first surface of an integrated circuit die with tape automated bonded (TAB) leads. The low thermal resistance of the heat sink increases the thermal performance of the package. The heat sink may also be mounted directly to the die with a conductive material so that the die is electrically grounded to the heat sink. The heat sink is then bonded to the leads of the lead frame that are dedicated to ground. In this embodiment, the heat sink provides the dual functions of a ground plate and a heat spreader.
Inventors
- 👤 Koushik Banerjee
- 👤 Siva Natarajan
- 👤 Debendra Mallik
- 👤 Praveen Jain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:26
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/40; H10W70/464; H10W70/466; H10W40/00; H10W40/70; H10W40/77; H10W40/778
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
An electronic package, comprising: a housing that has a top surface; a die within said housing, said die having a first surface and a second opposite surface; a dielectric tape which has a plurality conductive of leads attached to said first surface of said die; a lead frame that has a plurality of leads that extend from said housing and which are connected to said conductive leads of said dielectric tape; a thermally conductive metal heat sink mounted to said lead frame, said metal heat sink being adjacent to said second surface of said die and extending to said top surface of said housing; a conductive adhesive that thermally and electrically couples said die to said heat sink and said lead frame to create an electrical and thermal path from said die to said lead frame through said heat sink.
Claim 2
Dependent Claim
140 words
An electronic package, comprising: a housing that has a top surface; a die within said housing, said die having a first surface and a second opposite surface; a dielectric tape which has a plurality conductive of leads attached to said first surface of said die; a lead frame that has a plurality of leads that extend from said housing and which are connected to said conductive leads of said dielectric tape; a thermally conductive metal heat sink mounted to said lead frame, said metal heat sink being adjacent to said second surface of said die and extending to said top surface of said housing; a conductive adhesive that thermally and electrically couples said die to said heat sink and said lead frame to create an electrical and thermal path from said die to said lead frame through said heat sink.
Claim 3
Dependent Claim
21 words
The package as recited in claim 1, wherein said heat sink has an outer flange that is embedded into said housing.
Claim 4
Dependent Claim
134 words
An electronic package, comprising: a housing that has a top surface; a die within said housing, said die having a first surface and a second opposite surface; a dielectric tape which has a plurality of conductive leads attached to said first surface of said die; a lead frame that has a plurality of leads that extend from said housing and which are connected to said conductive leads of said dielectric tape; and, a thermally conductive metal heat sink that is mounted to said second surface of said die and which extends to said top surface of said housing; a conductive adhesive that thermally and electrically couples said die to said heat sink and said lead frame to create an electrical and thermal path from said die to said lead frame through said heat sink.
Claim 5
Dependent Claim
134 words
An electronic package, comprising: a housing that has a top surface; a die within said housing, said die having a first surface and a second opposite surface; a dielectric tape which has a plurality of conductive leads attached to said first surface of said die; a lead frame that has a plurality of leads that extend from said housing and which are connected to said conductive leads of said dielectric tape; and, a thermally conductive metal heat sink that is mounted to said second surface of said die and which extends to said top surface of said housing; a conductive adhesive that thermally and electrically couples said die to said heat sink and said lead frame to create an electrical and thermal path from said die to said lead frame through said heat sink.
Claim 6
Dependent Claim
21 words
The package as recited in claim 3, wherein said heat sink has an outer flange that is embedded into said housing.
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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) | 1998-08-21 | 1999-02-20 | 1999-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-21 | 2003-02-20 | 2003-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-21 | 2007-02-20 | 2007-08-22 | $7700.00 | Window Closed / Lapsed |