Patent US5894108A successfully refreshed from Google Patents.
US5894108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic package with exposed die
Assignee: National Semiconductor Corp
•
Filing: 1997-02-11
•
Granted: 1999-04-13
•
Expires: 2017-02-11
Abstract
Abstract A molded plastic package incorporates a lead frame which includes a plurality of leads radially aligned around a central opening. A die is mounted in the central opening and is electrically connected to the leads by wire bonding. A molded plastic casing is formed over the die, wiring and lead frame to encapsulate the package. The lower surfaces of the die and lead frame are exposed through the package. A method for making the molded plastic package includes mounting the die and lead frame onto an adhesive tape, electrically connecting the die to the leads by wire bonding, forming a molded plastic casing over the die, wire bonding and lead frame, and then removing the adhesive tape to expose the lower surfaces of the die and the lead frame.
Inventors
- 👤 Shahram Mostafazadeh
- 👤 Joseph O. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:32
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/01; H10W74/019; H10W74/10; H10W74/111; H10W72/00; H10W72/071; H10W72/075; H10W72/07502; H10W72/07504; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W72/851; H10W72/874; H10W72/884; H10W74/131; H10W74/142; H10W90/00; H10W90/701; H10W90/731; H10W90/736; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
163 words
An electrical device comprising: a flat lead frame including plurality of leads and an opening, the lead frame having opposing first and second surfaces; an integrated circuit die disposed in the opening of the lead frame, the die including opposing first and second surfaces and having a plurality of die bond pads located on the first surface; a plurality of wires, each of the plurality of wires extending from one of the die bond pads to one of the plurality of leads; and a plastic casing formed on the first surface of the die, the plurality of wires, and the first surface of the lead frame; wherein; the second surface of the die is exposed through the plastic casing, and the second surface of the die and the second surface of the lead frame are co-planar, the plastic casing includes opposing first and second surfaces; and the second surface of the plastic casing and the second surface of the lead frame are co-planar.
Claim 2
Dependent Claim
163 words
An electrical device comprising: a flat lead frame including plurality of leads and an opening, the lead frame having opposing first and second surfaces; an integrated circuit die disposed in the opening of the lead frame, the die including opposing first and second surfaces and having a plurality of die bond pads located on the first surface; a plurality of wires, each of the plurality of wires extending from one of the die bond pads to one of the plurality of leads; and a plastic casing formed on the first surface of the die, the plurality of wires, and the first surface of the lead frame; wherein; the second surface of the die is exposed through the plastic casing, and the second surface of the die and the second surface of the lead frame are co-planar, the plastic casing includes opposing first and second surfaces; and the second surface of the plastic casing and the second surface of the lead frame are co-planar.
Claim 3
Dependent Claim
13 words
The electrical device of claim 1, wherein the plastic casing comprises molded plastic.
Claim 4
Dependent Claim
20 words
The electrical device of claim 1, wherein the second surface of the lead frame is exposed through the plastic casing.
References Cited (Backward Citations)
US5276351A
Cited
US5200362A
Cited
US5273938A
Cited
US5157480A
Cited
US5296738A
Cited
US5200809A
Cited
US5177669A
Cited
US5483098A
Cited
US5450283A
Cited
US5604376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-04-12 | 2002-10-12 | 2003-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-04-12 | 2006-10-12 | 2007-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-04-12 | 2010-10-12 | 2011-04-13 | $7700.00 | Window Closed / Lapsed |