US5705431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production method for insulated semiconductor device
Assignee: NEC Electronics Corp
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Filing: 1997-03-04
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Granted: 1998-01-06
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Expires: 2017-03-04
Abstract
Abstract The invention provides a production method for an insulated semiconductor device which eliminates displacement between positions of upper and lower metallic mold cavities (between upper and lower caps) when a resin is filled to achieve improvement in quality and productivity. A lead shaping apparatus for shaping inner lead portions of a flat hoop frame supplied thereto from a frame supply apparatus is located between the frame supply apparatus and a die bonding apparatus so that, before die bonding of semiconductor pellets is performed, shaping of the inner lead portions is performed. Thereafter, die bonding and wire bonding are performed for the flat hoop frame, and then, resin is filled only into a lower metallic mold cavity by a resin filling apparatus to embed the inner lead portions in the resin.
Inventors
- 👤 Motohisa Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:35
CPC Classifications
H; H10; H10W; H10W72/00; H10W74/00; H10W74/01; H10W74/016; H10W70/00; H10W70/40; H10W70/481; H10W72/01; H10W72/0198; H10W72/50; H10W72/531; H10W72/536; H10W72/5363; H10W72/541; H10W72/5445; H10W72/5449; H10W90/00; H10W90/701; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
176 words
A production method for an insulated semiconductor device, comprising the steps of: forming a flat hoop frame having a plurality of rows of sets of leads such that inner lead portions of the leads extend farther than corresponding resin filling centers so that outer lead portions of the leads may be positioned at predetermined positions with respect to outer profiles of semiconductor devices after resin is filled and supplying the flat hoop frame from a frame supply apparatus; shaping the inner lead portions of the leads of the flat hoop frame simultaneously for the plurality of rows and for a plurality of pitches by a lead shaping apparatus; performing die bonding of semiconductor pellets and wire bonding for the flat hoop frame; and filling, for each set of leads, resin into one of two cavities by a resin filling apparatus so that the outer lead portions of the leads of the flat hoop frame may be positioned at the predetermined positions with respect to the outer profiles of the semiconductor devices after the resin is filled.
Claim 2
Dependent Claim
176 words
A production method for an insulated semiconductor device, comprising the steps of: forming a flat hoop frame having a plurality of rows of sets of leads such that inner lead portions of the leads extend farther than corresponding resin filling centers so that outer lead portions of the leads may be positioned at predetermined positions with respect to outer profiles of semiconductor devices after resin is filled and supplying the flat hoop frame from a frame supply apparatus; shaping the inner lead portions of the leads of the flat hoop frame simultaneously for the plurality of rows and for a plurality of pitches by a lead shaping apparatus; performing die bonding of semiconductor pellets and wire bonding for the flat hoop frame; and filling, for each set of leads, resin into one of two cavities by a resin filling apparatus so that the outer lead portions of the leads of the flat hoop frame may be positioned at the predetermined positions with respect to the outer profiles of the semiconductor devices after the resin is filled.
Claim 3
Dependent Claim
57 words
A production method for an insulated semiconductor device as claimed in claim 1, wherein the inner lead portions of the leads of the flat hoop frame are elongated farther than the positions of the resin filling centers in accordance with the lead shaping amount determined taking a semiconductor pellet thickness and a bonding wire height into consideration.
Claim 4
Dependent Claim
84 words
A production method for an insulated semiconductor device as claimed in claim 1, wherein shaping of the inner lead portions of the leads of the flat hoop frame supplied from said frame supply apparatus is performed prior to the step of die bonding semiconductor pellets, and in the resin filling step following the die bonding step and the wire bonding step, the resin is filled into one of an upper metallic mold cavity and a lower metallic mold cavity for each set of leads.
Claim 5
Dependent Claim
42 words
A production method for an insulated semiconductor device as claimed in claim 3, wherein the inner lead portions of the leads of the flat hoop frame extend by a predetermined additional length farther than the positions of the individual resin filling centers.
Claim 6
Dependent Claim
65 words
A production method for an insulated semiconductor device as claimed in claim 3, wherein the inner lead portions of the leads of the flat hoop frame are worked into an L-shape at predetermined positions in the individual longitudinal directions in such a manner as to be positioned on the upper side or the lower side with respect to the outer lead portions of the leads.
Claim 7
Dependent Claim
46 words
A production method for an insulated semiconductor device as claimed in claim 3, wherein, in each of the semiconductor devices filled with the resin, the outer lead portions of the leads extend along an end face of the semiconductor device and outwardly from the end face.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-05 | 2001-07-07 | 2002-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-05 | 2005-07-07 | 2006-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-05 | 2009-07-07 | 2010-01-06 | $7700.00 | Window Closed / Lapsed |