US6239489B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforcement of lead bonding in microelectronics packages
Assignee: Micron Technology Inc
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Filing: 1999-07-30
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Granted: 2001-05-29
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Expires: 2019-07-30
Abstract
Abstract The present invention is directed toward an apparatus and method of reinforcement of lead bonding in microelectronics packages. In one embodiment, a microelectronics package includes a microelectronics device having a bond pad, a conductive lead having a first end bonded to the bond pad to form a lead bond, an encapsulating material at least partially disposed about the conductive lead, and a reinforcement portion at least partially disposed about the lead bond and at least partially coupling the first end to the bond pad. The reinforcement portion has a greater modulus of elasticity and/or a greater bond strength than the encapsulating material. During thermal cycling of the microelectronics package, bond liftoff due to CTE mismatch is prevented by the reinforcement portion. The reinforcement portion may include a non-conductive adhesive material that physically secures the conductive lead to the bond pad, or alternately, an electrically conductive adhesive material that both physically and/or electrically couples the conductive lead to the bond pad. In an alternate embodiment, a microelectronics package includes a microelectronics device, an interposer, a plurality of conductive leads and a plurality of bond pads, and the reinforcement portion is disposed about a plurality of lead bonds. In this embodiment, the reinforcement portion may include a non-conductive adhesive material, or an anisotropically conductive material.
Inventors
- 👤 Tongbi Jiang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:07
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/68; H10W72/00; H10W72/90; H10W72/20; H10W72/29; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W72/60; H10W72/641; H10W72/646; H10W72/701; H10W90/00; H10W90/701; H10W90/761; H10W90/764
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
112 words
A microelectronics package, comprising: a microelectronics device having a bond pad; an elongated conductive lead having a first end directly bonded to the bond pad to form a lead bond; a reinforcement portion at least partially disposed about the lead bond and a first portion of the conductive lead proximate to the first end, wherein the first end and the bond pad are substantially encapsulated by the reinforcement portion; and an encapsulating material at least partially disposed about the reinforcement portion and a second portion of the conductive lead, the second portion not having the reinforcement portion disposed thereabout, the reinforcement portion having a greater modulus of elasticity than the encapsulating material.
Claim 2
Dependent Claim
112 words
A microelectronics package, comprising: a microelectronics device having a bond pad; an elongated conductive lead having a first end directly bonded to the bond pad to form a lead bond; a reinforcement portion at least partially disposed about the lead bond and a first portion of the conductive lead proximate to the first end, wherein the first end and the bond pad are substantially encapsulated by the reinforcement portion; and an encapsulating material at least partially disposed about the reinforcement portion and a second portion of the conductive lead, the second portion not having the reinforcement portion disposed thereabout, the reinforcement portion having a greater modulus of elasticity than the encapsulating material.
Claim 3
Dependent Claim
19 words
The microelectronics package of claim 1 wherein the reinforcement portion has a greater bond strength than the encapsulating material.
Claim 4
Dependent Claim
15 words
The microelectronics package of claim 1 wherein the reinforcement portion comprises an electrically non-conductive material.
Claim 5
Dependent Claim
15 words
The microelectronics package of claim 1 wherein the reinforcement portion comprises an electrically conductive material.
Claim 6
Dependent Claim
16 words
The microelectronics package of claim 4 wherein the electrically conductive material comprises an anisotropically conductive material.
Claim 7
Dependent Claim
30 words
The microelectronics package of claim 1 wherein the conductive lead includes a flexible portion proximate the first end, the encapsulating material being at least partially disposed about the flexible portion.
Claim 8
Dependent Claim
19 words
The microelectronics package of claim 6 wherein the reinforcement portion is at least partially disposed about the flexible portion.
Claim 9
Dependent Claim
14 words
The microelectronics package of claim 1 wherein the encapsulating material comprises an elastomer material.
Claim 10
Dependent Claim
13 words
The microelectronics package of claim 1 wherein the microelectronics device comprises a die.
Claim 11
Dependent Claim
21 words
The microelectronics package of claim 1 wherein the first end of the conductive lead is ultrasonically bonded to the bond pad.
Claim 12
Dependent Claim
17 words
The microelectronics package of claim 1 wherein the first end is thermally bonded to the bond pad.
Claim 13
Dependent Claim
16 words
The microelectronics package of claim 1 wherein the first end is soldered to the bond pad.
Claim 14
Dependent Claim
29 words
The microelectronics package of claim 1 , further comprising a lead frame having a contact pad, the conductive lead having a second end electrically coupled to the contact pad.
Claim 15
Dependent Claim
17 words
The microelectronics package of claim 13 , further comprising a conductive bump formed on the contact pad.
Claim 16
Dependent Claim
39 words
The microelectronics package of claim 13 , further comprising a spacing layer having a first surface in contact with the microelectronics device and a second surface substantially opposite the first surface that is in contact with the lead frame.
Claim 17
Dependent Claim
107 words
A microelectronics package, comprising: a microelectronics device having a bond pad; a conductive lead having a first end directly bonded to the bond pad to form a lead bond; a reinforcement portion at least partially disposed about the lead bond and a first portion of the conductive lead proximate to the first end, wherein the first end and the bond pad are substantially encapsulated by the reinforcement portion; and an encapsulating material at least partially disposed about the reinforcement portion and a second portion of the conductive lead not having the reinforcement portion disposed thereabout, the reinforcement portion having a greater bond strength than the encapsulating material.
Claim 18
Dependent Claim
107 words
A microelectronics package, comprising: a microelectronics device having a bond pad; a conductive lead having a first end directly bonded to the bond pad to form a lead bond; a reinforcement portion at least partially disposed about the lead bond and a first portion of the conductive lead proximate to the first end, wherein the first end and the bond pad are substantially encapsulated by the reinforcement portion; and an encapsulating material at least partially disposed about the reinforcement portion and a second portion of the conductive lead not having the reinforcement portion disposed thereabout, the reinforcement portion having a greater bond strength than the encapsulating material.
Claim 19
Dependent Claim
20 words
The microelectronics package of claim 16 wherein the reinforcement portion has a greater modulus of elasticity than the encapsulating material.
Claim 20
Dependent Claim
15 words
The microelectronics package of claim 16 wherein the reinforcement portion comprises an electrically non-conductive material.
Claim 21
Dependent Claim
15 words
The microelectronics package of claim 16 wherein the reinforcement portion comprises an electrically conductive material.
Claim 22
Dependent Claim
16 words
The microelectronics package of claim 19 wherein the electrically conductive material comprises an anisotropically conductive material.
Claim 23
Dependent Claim
30 words
The microelectronics package of claim 16 wherein the conductive lead includes a flexible portion proximate the first end, the encapsulating material being at least partially disposed about the flexible portion.
Claim 24
Dependent Claim
19 words
The microelectronics package of claim 21 wherein the reinforcement portion is at least partially disposed about the flexible portion.
Claim 25
Dependent Claim
14 words
The microelectronics package of claim 16 wherein the encapsulating material comprises an elastomer material.
Claim 26
Dependent Claim
29 words
The microelectronics package of claim 16 , further comprising a lead frame having a contact pad, the conductive lead having a second end electrically coupled to the contact pad.
Claim 27
Dependent Claim
39 words
The microelectronics package of claim 24 , further comprising a spacing layer having a first surface in contact with the microelectronics device and a second surface substantially opposite the first surface that is in contact with the lead frame.
Claim 28
Dependent Claim
150 words
A microelectronics package, comprising: a microelectronics device having a plurality of bond pads; a plurality of conductive leads each having a first end directly bonded to one of the bond pads to form a plurality of lead bonds; an interposer having a plurality of contact pads, each conductive lead having a second end electrically coupled to one of the contact pads; a spacing layer having a first surface contacting the microelectronics device and a second surface substantially opposite the first surface and contacting the interposer; a reinforcement portion at least partially disposed about the lead bond pads and a first portion of the conductive leads proximate to the first end; and an encapsulating material at least partially disposed about the reinforcement portion and a second portion of the conductive leads not having the reinforcement portion disposed thereabout, the reinforcement portion having a greater modulus of elasticity than the encapsulating material.
Claim 29
Dependent Claim
150 words
A microelectronics package, comprising: a microelectronics device having a plurality of bond pads; a plurality of conductive leads each having a first end directly bonded to one of the bond pads to form a plurality of lead bonds; an interposer having a plurality of contact pads, each conductive lead having a second end electrically coupled to one of the contact pads; a spacing layer having a first surface contacting the microelectronics device and a second surface substantially opposite the first surface and contacting the interposer; a reinforcement portion at least partially disposed about the lead bond pads and a first portion of the conductive leads proximate to the first end; and an encapsulating material at least partially disposed about the reinforcement portion and a second portion of the conductive leads not having the reinforcement portion disposed thereabout, the reinforcement portion having a greater modulus of elasticity than the encapsulating material.
Claim 30
Dependent Claim
19 words
The microelectronics package of claim 26 wherein the reinforcement portion has a greater bond strength than the encapsulating material.
Claim 31
Dependent Claim
15 words
The microelectronics package of claim 26 wherein the reinforcement portion comprises an electrically non-conductive material.
Claim 32
Dependent Claim
15 words
The microelectronics package of claim 26 wherein the reinforcement portion comprises an anisotropically conductive material.
Claim 33
Dependent Claim
32 words
The microelectronics package of claim 26 wherein at least one conductive lead includes a flexible portion proximate the first end, the encapsulating material being at least partially disposed about the flexible portion.
Claim 34
Dependent Claim
19 words
The microelectronics package of claim 30 wherein the reinforcement portion is at least partially disposed about the flexible portion.
Claim 35
Dependent Claim
19 words
The microelectronics package of claim 26 , further comprising a plurality of conductive bumps formed on the contact pads.
Claim 36
Dependent Claim
164 words
A microelectronics package, comprising: a microelectronics device having a plurality of bond pads; a plurality of conductive leads each having a first end directly bonded to one of the bond pads to form a plurality of lead bonds; an interposer having a plurality of contact pads, each conductive lead having a second end electrically coupled to one of the contact pads; a spacing layer having a first surface contacting the microelectronics device and a second surface substantially opposite the first surface and contacting the interposer; a reinforcement portion at least partially disposed about the lead bond pads and a first portion of the conductive leads proximate to the first end, wherein the first end and the bond pad are substantially encapsulated by the reinforcement portion; and an encapsulating material at least partially disposed about the reinforcement portion and a second portion of the conductive leads not having the reinforcement portion disposed thereabout, the reinforcement portion having a greater bond strength than the encapsulating material.
Claim 37
Dependent Claim
164 words
A microelectronics package, comprising: a microelectronics device having a plurality of bond pads; a plurality of conductive leads each having a first end directly bonded to one of the bond pads to form a plurality of lead bonds; an interposer having a plurality of contact pads, each conductive lead having a second end electrically coupled to one of the contact pads; a spacing layer having a first surface contacting the microelectronics device and a second surface substantially opposite the first surface and contacting the interposer; a reinforcement portion at least partially disposed about the lead bond pads and a first portion of the conductive leads proximate to the first end, wherein the first end and the bond pad are substantially encapsulated by the reinforcement portion; and an encapsulating material at least partially disposed about the reinforcement portion and a second portion of the conductive leads not having the reinforcement portion disposed thereabout, the reinforcement portion having a greater bond strength than the encapsulating material.
Claim 38
Dependent Claim
20 words
The microelectronics package of claim 33 wherein the reinforcement portion has a greater modulus of elasticity than the encapsulating material.
Claim 39
Dependent Claim
15 words
The microelectronics package of claim 33 wherein the reinforcement portion comprises an electrically non-conductive material.
Claim 40
Dependent Claim
15 words
The microelectronics package of claim 33 wherein the reinforcement portion comprises an anisotropically conductive material.
Claim 41
Dependent Claim
32 words
The microelectronics package of claim 33 wherein at least one conductive lead includes a flexible portion proximate the first end, the encapsulating material being at least partially disposed about the flexible portion.
Claim 42
Dependent Claim
19 words
The microelectronics package of claim 37 wherein the reinforcement portion is at least partially disposed about the flexible portion.
Claim 43
Dependent Claim
19 words
The microelectronics package of claim 33 , further comprising a plurality of conductive bumps formed on the contact pads.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-05-28 | 2004-11-27 | 2005-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-05-28 | 2008-11-27 | 2009-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-05-28 | 2012-11-27 | 2013-05-29 | $7700.00 | Window Closed / Lapsed |