US5384286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for encapsulating a semiconductor chip, leadframe and heatsink
Assignee: Renesas Electronics Corp
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Filing: 1992-08-12
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Granted: 1995-01-24
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Expires: 2012-08-12
Abstract
Abstract A method mold for producing a semiconductor device having a heat-sinking plate and a leadframe. The heat-sinking frame and leadframe are precisely positioned on a lower mold with cooperating positioning holes and pins with a space between the heat-sinking frame and the leadframe. After an upper mold is clamped to the lower mold, resin is injected into a cavity in the mold to encapsulate the leadframe to which a semiconductor chip is attached and the heat-sinking plate into one body.
Inventors
- 👤 Tatsuya Hirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:39
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/70; H10W40/77; H10W40/778; H10W74/00; H10W74/01; H10W74/016; H10W72/00; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W90/00; H10W90/701; H10W90/751; H10W90/756; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49121
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
A method for producing a semiconductor device comprising: disposing a heat-sinking frame including supporting rails and a heat-sinking plate disposed between, coplanar with, and suspended from the supporting rails on a lower mold with the supporting rails being supported by the lower mold and with the heat-sinking plate spaced from the lower mold by a gap; disposing a leadframe having a die pad and a semiconductor chip mounted on the die pad on the lower mold with a gap between each part of the leadframe and the heat-sinking frame; clamping an upper mold to the lower mold; and injecting plastic resin between the clamped upper and lower molds and around the semiconductor chip within the clamped upper and lower molds to form molded plastic resin encapsulating the semiconductor chip, a portion of the leadframe, and the heat-sinking plate in one body.
Claim 2
Independent Claim
141 words
A method for producing a semiconductor device comprising: disposing a heat-sinking frame including supporting rails and a heat-sinking plate disposed between, coplanar with, and suspended from the supporting rails on a lower mold with the supporting rails being supported by the lower mold and with the heat-sinking plate spaced from the lower mold by a gap; disposing a leadframe having a die pad and a semiconductor chip mounted on the die pad on the lower mold with a gap between each part of the leadframe and the heat-sinking frame; clamping an upper mold to the lower mold; and injecting plastic resin between the clamped upper and lower molds and around the semiconductor chip within the clamped upper and lower molds to form molded plastic resin encapsulating the semiconductor chip, a portion of the leadframe, and the heat-sinking plate in one body.
Claim 3
Dependent Claim
67 words
The method for producing a semiconductor device defined in claim 1 including supporting the leadframe on a supporting surface of the lower mold, placing the heat-sinking frame into grooves in the supporting surface shaped to receive the heat-sinking frame, and injecting plastic resin into a space between the heat-sinking plate and a base surface penetrating into the lower mold deeper than the grooves and the supporting surface.
Claim 4
Dependent Claim
36 words
The method for producing a semiconductor device defined in claim 1 including positioning the leadframe and the heat-sinking frame with positioning holes in the leadframe and the heat-sinking frame engaging positioning pins on the lower mold.
Claim 5
Dependent Claim
26 words
The method for producing a semiconductor device defined in claim 1 including injecting the plastic resin in the gap between the leadframe and the heat-sinking plate.
Claim 6
Dependent Claim
27 words
The method for producing a semiconductor device defined in claim 1 including injecting the plastic resin in the gap between the heat-sinking plate and the lower mold.
Claim 7
Dependent Claim
37 words
The method for producing a semiconductor device defined in claim 1 including supporting the heat-sinking plate between the upper and lower molds with suspenders extending between the heat-sinking plate and the supporting rails of the heat-sinking frame.
Claim 8
Dependent Claim
44 words
The method for producing a semiconductor device defined in claim 1 wherein the heat-sinking frame comprises a plurality of heat-sinking plates connected between the supporting rails, the method including simultaneously placing the heat-sinking plates in a plurality of different cavities in the lower mold.
References Cited (Backward Citations)
US4043027A
Cited
US3659821A
Cited
US3778887A
Cited
US4680617A
Cited
JPH02137249A
Cited
JPH02163953A
Cited
JPH0445563A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-23 | 1998-07-25 | 1999-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-23 | 2002-07-25 | 2003-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-23 | 2006-07-25 | 2007-01-24 | $7700.00 | Window Closed / Lapsed |