US5121187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric device having a leadframe covered with an antioxidation film
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1989-10-11
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Granted: 1992-06-09
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Expires: 2009-10-11
Abstract
Abstract An improved electric device and a manufacturing method for the same is described. The device is for example an IC chip clothed with molding. The IC chip is mounted on a lead frame by means of an adhesive such as a glass-type silver paste which discharges little amount of gases and the rear surface of the lead frame is covered with an antioxidation film of silicon nitride.
Inventors
- 👤 Shunpei Yamazaki
- 👤 Kazuo Urata
- 👤 Itaru Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:03
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/10; H10W74/111; H10W74/127; H10W70/00; H10W70/40; H10W70/456; H10W70/458; H10W72/00; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W72/59; H10W90/00; H10W90/701; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
An electric device comprising: a leadframe made of a meal or alloy; an electronic part mounted on a surface of said leadframe by using an adhesive; and an enclosure made of an organic material enclosing said electronic part, wherein the adhesion of said organic material to said leadframe is enhanced by using a glass-type silver paste as said adhesive and by forming an antioxidation film on a back surface of the leadframe which is opposite to the surface on which said electronic part is mounted and wherein said antioxidation film is 300-4000Å thick.
Claim 2
Dependent Claim
93 words
An electric device comprising: a leadframe made of a meal or alloy; an electronic part mounted on a surface of said leadframe by using an adhesive; and an enclosure made of an organic material enclosing said electronic part, wherein the adhesion of said organic material to said leadframe is enhanced by using a glass-type silver paste as said adhesive and by forming an antioxidation film on a back surface of the leadframe which is opposite to the surface on which said electronic part is mounted and wherein said antioxidation film is 300-4000Å thick.
Claim 3
Dependent Claim
24 words
The device of claim 1 wherein said antioxidation film is selected from the group consisting of silicon nitride, silicon carbide and diamond like carbon.
Claim 4
Dependent Claim
13 words
The device of claim 1 wherein said electronic part is an IC chip.
Claim 5
Dependent Claim
13 words
The device of claim 1 wherein said lead frame is made of copper.
Claim 6
Dependent Claim
14 words
The device of claim 1 wherein said leadframe is made of a 42 alloy.
Claim 7
Dependent Claim
119 words
An electric device comprising: a leadframe made of a metal or alloy; an electronic part mounted on a surface of said leadframe by using an adhesive; and an enclosure made of an organic material enclosing said electronic part, wherein the adhesion of said organic material to said leadframe is enhanced by using a glass-type silver paste as said adhesive and by forming an antioxidation film on a back surface of the leadframe which is opposite to the surface on which said electronic part is mounted and wherein said glass-type silver paste includes a gaseous material which comprises H 2 O at 1000 ppmV, O 2 at 15.2 vol%, CO 2 at 3.4 vol% and N 2 at 81 vol%.
Claim 8
Dependent Claim
119 words
An electric device comprising: a leadframe made of a metal or alloy; an electronic part mounted on a surface of said leadframe by using an adhesive; and an enclosure made of an organic material enclosing said electronic part, wherein the adhesion of said organic material to said leadframe is enhanced by using a glass-type silver paste as said adhesive and by forming an antioxidation film on a back surface of the leadframe which is opposite to the surface on which said electronic part is mounted and wherein said glass-type silver paste includes a gaseous material which comprises H 2 O at 1000 ppmV, O 2 at 15.2 vol%, CO 2 at 3.4 vol% and N 2 at 81 vol%.
Claim 9
Dependent Claim
14 words
The device of claim 6, wherein said antioxidation film is made of silicon nitride.
Claim 10
Dependent Claim
13 words
The device of claim 6, wherein said electronic part is an IC chip.
Claim 11
Dependent Claim
12 words
The device of claim 6, wherein said leadframe is made of copper.
Claim 12
Dependent Claim
14 words
The device of claim 6, wherein said leadframe is made of a 42 alloy.
References Cited (Backward Citations)
US4396934A
Cited
US4472730A
Cited
US4486945A
Cited
US4758875A
Cited
US4711700A
Cited
JPS62152146A
Cited
US4866505A
Cited
EP0250146A1
Cited
US4872047A
Cited
JPS6411337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |