US5451812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leadframe for semiconductor devices
Assignee: Seiko Epson Corp
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Filing: 1994-12-21
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Granted: 1995-09-19
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Expires: 2014-12-21
Abstract
Abstract A leadframe for semiconductor devices is disclosed. The leadframe includes a die pad supported on the leadframe. A semiconductor chip is mounted on the die pad. The chip has a plurality of pads including at least one group of designated pads for communicating an identical signal, such as a power supply signal of the same level, with external circuits. A terminal on the leadframe is coupled to the group of designated pads. The terminal is attached to selected one or more leads on the leadframe for communicating the identical signal with the external circuits. The other pads on the chip, such as signal pads, are coupled to the corresponding leads on the leadframe. Thus, the total number of leads on the leadframe is reduced and more leads are available for the signal pads, resulting in efficient connections between the chip pads and the leads. Further, wires can be more freely drawn from the chip pads to the leads, resulting in better connections between the pads and the leads and better support for the wires by the leads.
Inventors
- 👤 Yoshihiko Gomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:30
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/40; H10W70/464; H10W70/421; H10W70/435; H10W72/00; H10W72/50; H10W72/541; H10W72/5445; H10W72/5449; H10W72/90; H10W72/931; H10W72/932; H10W90/00; H10W90/701; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
203 words
A leadframe for mounting thereon a semiconductor chip which has a plurality of bonding pad means positioned along at least one side of the chip and including a plurality of groups of designated bonding pad means, with each group of designated bonding pad means for communicating an identical signal with external circuits, the leadframe comprising: a frame having support means and a plurality of lead means for coupling the plurality of bonding pad means of the chip to the external circuits; mount means, positioned within said frame and attached to said support means, for supporting the chip; and a plurality of terminal means, with each terminal means, positioned between one side of said mount means and one end of at least some of said plurality of lead means and attached to at least one selected lead means, for coupling to an associated group of designated bonding pad means of the chip for communicating a respective identical signal with the external circuits through said at least one selected lead means; and a plurality of terminal connectors coupling said plurality of terminal means together around said mount means; wherein said plurality of terminal means and said plurality of lead means are comprised of separate layers.
Claim 2
Dependent Claim
203 words
A leadframe for mounting thereon a semiconductor chip which has a plurality of bonding pad means positioned along at least one side of the chip and including a plurality of groups of designated bonding pad means, with each group of designated bonding pad means for communicating an identical signal with external circuits, the leadframe comprising: a frame having support means and a plurality of lead means for coupling the plurality of bonding pad means of the chip to the external circuits; mount means, positioned within said frame and attached to said support means, for supporting the chip; and a plurality of terminal means, with each terminal means, positioned between one side of said mount means and one end of at least some of said plurality of lead means and attached to at least one selected lead means, for coupling to an associated group of designated bonding pad means of the chip for communicating a respective identical signal with the external circuits through said at least one selected lead means; and a plurality of terminal connectors coupling said plurality of terminal means together around said mount means; wherein said plurality of terminal means and said plurality of lead means are comprised of separate layers.
Claim 3
Dependent Claim
35 words
The leadframe of claim 1 wherein said support means includes a plurality of lead means, each of which is attached to one end of each of two adjacent terminal means as said selected lead means.
Claim 4
Dependent Claim
31 words
The leadframe of claim 1 wherein a selected number of said terminal means are for coupling to the associated groups of designated bonding pad means for receiving the respective identical signals.
Claim 5
Dependent Claim
49 words
The leadframe of claim 1 wherein each terminal means is positioned such that there are a first predetermined space between said terminal means and said side of said mount means and a second predetermined space between said terminal means and said end of said at least some lead means.
Claim 6
Dependent Claim
35 words
The leadframe of claim 4 wherein each terminal means has a substantially rectangular shape and is substantially parallel to said side of said mount means and said end of said at least some lead means.
Claim 7
Dependent Claim
25 words
The leadframe of claim 1 wherein a selected number of said terminal connectors are made of conductive materials for electrically coupling selected terminal means together.
Claim 8
Dependent Claim
25 words
The leadframe of claim 1 wherein all of said terminal connectors are made of non-conductive materials for electrically isolating said terminal means from one another.
Claim 9
Dependent Claim
204 words
A leadframe for mounting thereon a semiconductor chip which has a plurality of bonding pad means positioned along four sides of the chip and including a plurality of groups of designated bonding pad means, with each group of designated bonding pad means for communicating an identical signal with external circuits, the leadframe comprising: a frame having support means and a plurality of lead means for coupling the plurality of bonding pad means of the chip to the external circuits; mount means, positioned within said frame and attached to said support means, for supporting the chip, said mount means having four sides; and four terminal means, with each terminal means, positioned between one side of said mount means and one end of at least some of said plurality of lead means and attached to at least one selected lead means, for coupling to an associated group of designated bonding pad means of the chip for communicating a respective identical signal with the external circuits through said at least one selected lead means; and four terminal connectors each coupling two adjacent terminal means together at a corner of said mount means; wherein said four terminal means and said four lead means are comprised of separate layers.
Claim 10
Dependent Claim
204 words
A leadframe for mounting thereon a semiconductor chip which has a plurality of bonding pad means positioned along four sides of the chip and including a plurality of groups of designated bonding pad means, with each group of designated bonding pad means for communicating an identical signal with external circuits, the leadframe comprising: a frame having support means and a plurality of lead means for coupling the plurality of bonding pad means of the chip to the external circuits; mount means, positioned within said frame and attached to said support means, for supporting the chip, said mount means having four sides; and four terminal means, with each terminal means, positioned between one side of said mount means and one end of at least some of said plurality of lead means and attached to at least one selected lead means, for coupling to an associated group of designated bonding pad means of the chip for communicating a respective identical signal with the external circuits through said at least one selected lead means; and four terminal connectors each coupling two adjacent terminal means together at a corner of said mount means; wherein said four terminal means and said four lead means are comprised of separate layers.
Claim 11
Dependent Claim
35 words
The leadframe of claim 8 wherein said support means includes a plurality of lead means, each of which is attached to one end of each of two adjacent terminal means as said selected lead means.
Claim 12
Dependent Claim
31 words
The leadframe of claim 8 wherein a selected number of said terminal means are for coupling to the associated groups of designated bonding pad means for receiving the respective identical signals.
Claim 13
Dependent Claim
49 words
The leadframe of claim 8 wherein each terminal means is positioned such that there are a first predetermined space between said terminal means and said side of said mount means and a second predetermined space between said terminal means and said end of said at least some lead means.
Claim 14
Dependent Claim
35 words
The leadframe of claim 11 wherein each terminal means has a substantially rectangular shape and is substantially parallel to said side of said mount means and said end of said at least some lead means.
Claim 15
Dependent Claim
25 words
The leadframe of claim 8 wherein a selected number of said terminal connectors are made of conductive materials for electrically coupling selected terminal means together.
Claim 16
Dependent Claim
25 words
The leadframe of claim 8 wherein all of said terminal connectors are made of non-conductive materials for electrically isolating said terminal means from one another.
References Cited (Backward Citations)
US3698082A
Cited
US4027326A
Cited
US4092664A
Cited
US4403240A
Cited
US4567643A
Cited
JPS61148854A
Cited
JPS6464347A
Cited
US4979016A
Cited
US5089878A
Cited
US5115298A
Cited
US5196725A
Cited
US5168368A
Cited
US5220195A
Cited
JPH0666351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-09-18 | 1999-03-20 | 1999-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-18 | 2003-03-20 | 2003-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-18 | 2007-03-20 | 2007-09-19 | $7700.00 | Window Closed / Lapsed |