USRE45932E1 - Semiconductor device and method of manufacturing the same - Google Patents
Semiconductor device and method of manufacturing the same Download PDFInfo
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- USRE45932E1 USRE45932E1 US14/278,877 US201414278877A USRE45932E US RE45932 E1 USRE45932 E1 US RE45932E1 US 201414278877 A US201414278877 A US 201414278877A US RE45932 E USRE45932 E US RE45932E
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- wiring substrate
- semiconductor chip
- semiconductor device
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- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49811—Additional leads joined to the metallisation on the insulating substrate, e.g. pins, bumps, wires, flat leads
- H01L23/49816—Spherical bumps on the substrate for external connection, e.g. ball grid arrays [BGA]
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- H01L24/97—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
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Definitions
- This invention relates to a semiconductor device and, in particular, relates to a semiconductor device improved in strength of a bump array to which thermal stress is particularly applied among bumps that serve as external terminals of the semiconductor device, and further relates to a method of manufacturing such a semiconductor device.
- Semiconductor devices having a structure in which a semiconductor chip is mounted on one surface of a wiring substrate and bumps are arranged on the other surface thereof.
- a semiconductor device having such a structure is used while being disposed on a mounting board, there are instances where thermal stress is applied to bumps due to a difference in thermal expansion coefficient between a wiring substrate and the mounting board to cause the bumps to fracture, thus leading to the occurrence of connection failure.
- the chips 6 made of, for example, a low- ⁇ silicon are concentrated, and fixed rigidly by the wiring substrate 2 and a sealing body 10 each made of, for example, an epoxy resin having ⁇ greater than that of the silicon. Therefore, the bumps 5 disposed under the wiring substrate 2 in the chip shift direction (on the side A in FIG. 10 ) are largely subjected to stress generated by the difference in ⁇ as compared with the bumps 5 disposed in the other place.
- a bump array 5 - 1 located at a position farthest from the center of the wiring substrate 2 in the chip shift direction is subjected to extremely great stress. As a result, bump fracture tends to occur at this portion and thus the lifetime of those bumps decreases, which shortens the lifetime of the semiconductor device itself.
- Patent Document 1 discloses a wiring substrate wherein the size of bumps at four corners of the wiring substrate is set greater for increasing the connection strength of those bumps.
- Patent Document 2 discloses a bump arrangement structure wherein the contour of a bump arrangement at the outer peripheral portions of a substrate is set concentric with the center of the substrate to thereby prevent stress from concentrating on specific bumps to cause fracture of those bumps.
- Patent Document 3 discloses a multi-chip semiconductor device in which upper and lower chips are bump-connected to each other and the upper chip is disposed so as to be shifted relative to the lower chip, wherein the center of gravity of the upper chip is set to fall within a connecting bump region between the upper and lower chips, thereby improving the connection between the upper and lower chips.
- the bump connection between the upper and lower chips in the semiconductor device can be improved, no teaching is given about a measure for improving the bump connection between the semiconductor device and a mounting board.
- JP-A Japanese Unexamined Patent Application Publication
- Patent Document 4 discloses a structure in which lands on the mounting board side each have a concave-convex shape.
- Patent Document 5 discloses a technique of shifting bump arrays by a half pitch to narrow bump intervals, thereby achieving a high-density bump arrangement.
- Patent Document 6 discloses a structure in which large-diameter bumps or dummy bumps are disposed as auxiliary bumps at the outer peripheral portions of a bump arrangement.
- any of the above related art technologies cannot be said to be a measure against fracture of specific bumps caused by biased stress concentration on those bumps which is generated by disposing a semiconductor chip so as to be shifted in one direction from the center of a wiring substrate.
- the present invention provides a semiconductor device with an improved bump structure of a wiring substrate, wherein a semiconductor chip is mounted so as to be shifted from the center of the wiring substrate.
- a ball grid array (BGA) semiconductor device comprises a wiring substrate, a semiconductor chip disposed on one surface side of the wiring substrate, and a bump arrangement as external terminals disposed on a surface side, opposite to the one surface side, of the wiring substrate.
- the semiconductor chip is mounted so that a center of the semiconductor chip is shifted from a center of the semiconductor device by one pitch or more of the bump arrangement, and the bump arrangement has a reinforcing structure for a bump array located at a position farthest from the center of the semiconductor device in a shift direction of the semiconductor chip.
- the reinforcing structure is a structure in which dummy bumps are formed on an outer side of the bump array located at the position farthest from the center of the semiconductor device in the shift direction of the semiconductor chip.
- the reinforcing structure may be a structure in which a center of the bump arrangement is shifted from the center of the semiconductor device by one pitch or more of the bump arrangement in the shift direction of the semiconductor chip.
- the reinforcing structure may be a structure in which lands of the wiring substrate, fixed with the bump array located at the position farthest from the center of the semiconductor device in the shift direction of the semiconductor chip, each have a concave-convex shape.
- the reinforcing structure may be a structure in which bumps of the bump array, located at the position farthest from the center of the semiconductor device in the shift direction of the semiconductor chip, are formed to be larger in size than bumps of bump arrays at other positions.
- a ball grid array (BGA) semiconductor device comprises a wiring substrate, a plurality of semiconductor chips disposed on one surface side of the wiring substrate, and a bump arrangement as external terminals disposed on a surface side, opposite to the one surface side, of the wiring substrate; wherein at least one of the plurality of semiconductor chips is mounted so that a center of the at least one of the plurality of semiconductor chips is shifted from a center of the semiconductor device by one pitch or more of the bump arrangement, the bump arrangement has a reinforcing structure for a bump array located at a position farthest from the center of the semiconductor device in a shift direction of the at least one of the plurality of semiconductor chips, and the plurality of semiconductor chips have a stacked structure in which the semiconductor chips are mounted so as to be shifted farther from the center of the semiconductor device as the semiconductor chips are located farther from the wiring substrate in a stacking direction.
- a method of manufacturing ball grid array (BGA) semiconductor devices each comprising a wiring substrate, a plurality of semiconductor chips disposed on one surface side of the wiring substrate, and a bump arrangement as external terminals disposed on a surface side, opposite to the one surface side, of the wiring substrate.
- the method comprises the steps of: preparing a wiring base substrate having a plurality of wiring substrate regions arranged in a matrix; and forming a chip-mounted wiring base substrate having a semiconductor chip on one surface side of each of the wiring substrate regions of the wiring base substrate, the semiconductor chip disposed so as to be shifted in one direction with respect to a position which is to be a center of a semiconductor device.
- the method further comprises forming a multichip-mounted wiring base substrate by stacking another semiconductor chip so as to be shifted in the one direction with respect to the semiconductor chip in each of the wiring substrate regions of the chip-mounted wiring base substrate; forming a sealed wiring base substrate by covering entirely the semiconductor chips of the multichip-mounted wiring base substrate with a sealing resin; forming a bump-mounted wiring base substrate having a bump arrangement on a surface side, opposite to the one surface side where the semiconductor chips are stacked, of each of the wiring substrate regions of the sealed wiring base substrate, the bump arrangement having a reinforcing structure for a bump array located at a position farthest in the one direction from the position which is to be the center of the semiconductor device; and dicing the bump-mounted wiring base substrate into pieces for the wiring substrate regions, respectively, to provide the semiconductor devices.
- a bump arrangement in a semiconductor device having a structure in which a semiconductor chip is largely shifted to one side, a bump arrangement has a reinforcing structure for a bump array located at a position farthest from the center of the semiconductor device in a shift direction of the semiconductor chip and, therefore, it is possible to relax stress concentration on specific bumps or strengthen those specific bumps.
- a bump arrangement since a bump arrangement has a reinforcing structure for a bump array located at a position farthest from the center of a semiconductor device in a shift direction of a semiconductor chip, it is possible to relax stress concentration on specific bumps or strengthen those specific bumps.
- FIG. 1 is a sectional view of a semiconductor device according to a first embodiment of this invention
- FIG. 2 is a plan view of the semiconductor device of FIG. 1 as seen from its lower side;
- FIGS. 3a-1 , 3 b- 1 , 3 a- 2 , 3 b- 2 , 3 a- 3 , 3 b- 3 , 3 c, 3 d, and 3 e are sectional views for explaining manufacturing processes of semiconductor devices each according to the first embodiment of this invention
- FIG. 4 is a sectional view of a semiconductor device according to a second embodiment of this invention.
- FIG. 5 is a plan view of the semiconductor device of FIG. 4 as seen from its lower side;
- FIG. 6 is a sectional view of a semiconductor device according to a third embodiment of this invention.
- FIG. 7 is a plan view of the semiconductor device of FIG. 6 as seen from its lower side;
- FIG. 8 is a sectional view of a semiconductor device according to a fourth embodiment of this invention.
- FIG. 9 is a plan view of the semiconductor device of FIG. 8 as seen from its lower side;
- FIG. 10 is a sectional view of a related-art semiconductor device
- FIG. 11 is a plan view of the semiconductor device of FIG. 10 as seen from its lower side;
- FIG. 12 is a plan view illustrating a prior art bump arrangement of a wiring substrate.
- FIG. 13 is a plan view illustrating another prior art bump arrangement of a wiring substrate.
- FIG. 1 is a sectional view of a semiconductor device according to a first embodiment of this invention.
- FIG. 2 is a plan view of the semiconductor device of FIG. 1 as seen from its terminal surface side.
- the semiconductor device generally denoted by numeral 1 , of the first embodiment comprises a generally square wiring substrate 2 .
- the wiring substrate 2 is, for example, a glass epoxy substrate with a thickness of 0.25 mm and is formed with predetermined wiring patterns.
- a plurality of connection pads 3 are formed on one surface of the wiring substrate 2 .
- a plurality of lands 4 are formed on the other surface of the wiring substrate 2 .
- the connection pads 3 and the corresponding lands 4 are electrically connected together by the wiring patterns of the wiring substrate 2 .
- bumps 5 such as, for example, solder balls that respectively serve as external terminals are mounted on the lands 4 , respectively.
- the number of the lands 4 and the bumps 5 on the terminal surface side of the wiring substrate 2 is largely reduced as compared with an actual number thereof, thereby providing a schematic illustration.
- the external terminals 5 are arranged in a generally grid pattern at a predetermined interval (pitch) and, in this example, the number thereof is eight in the length direction (vertical direction in FIG. 2 ) and nine in the width direction (horizontal direction in FIG. 2 ), including a bump reinforcing structure.
- a plurality of semiconductor chips 6 are fixedly mounted in a stacked manner through an insulating adhesive such as, for example, a DAF (die attach film) 7 .
- a DAF die attach film
- Each semiconductor chip 6 is formed with, for example, a logic circuit or a memory circuit on one surface thereof. Further, a plurality of electrode pads 8 are formed on the one surface of each semiconductor chip 6 at positions near the outer edge thereof.
- the electrode pads 8 of the semiconductor chips 6 are electrically connected to the corresponding connection pads 3 of the wiring substrate 2 through the conductive wires 9 , respectively, each made of a conductive material such as, for example, Au or Cu.
- a sealing body 10 is formed over the one surface of the wiring substrate 2 so as to cover the semiconductor chips 6 and the wires 9 .
- the sealing body 10 is made of a thermosetting resin such as, for example, an epoxy resin.
- the bumps 5 are mounted on the lands 4 formed on the other surface of the wiring substrate 2 whose one surface is covered with the sealing body 10 . As also described above, the bumps 5 are arranged as the external terminals in the generally grid pattern at the predetermined interval as shown in FIG. 2 .
- this embodiment is configured such that, with respect to an outermost bump array 5 - 1 disposed at a position farthest from the center of the wiring substrate 2 in the chip shift direction (on the side A in FIGS. 1 and 2 ), i.e. at a portion where the stress concentrates most, a dummy bump array 5 - 2 is additionally disposed on a side further away from the center of the wiring substrate 2 in the chip shift direction so as to relax the stress that concentrates on the bump array 5 - 1 , thereby making it possible to prolong the lifetime of the bump array 5 - 1 . This further makes it possible to improve the lifetime of the semiconductor device.
- the dummy bump array 5 - 2 is for reinforcing the bump array 5 - 1 , but not for electrical connection to the semiconductor chips 6 , and thus does not need to be electrically connected to the semiconductor chips 6 .
- the bumps 5 are arranged at rectangular grid points, a first arrangement direction is substantially parallel to a first side of the generally square wiring substrate 2 , and a second arrangement direction perpendicular to the first arrangement direction is substantially parallel to a second side, perpendicular to the first side, of the wiring substrate 2 .
- Each semiconductor chip 6 has a substantially rectangular shape and is mounted with its mutually perpendicular sides arranged parallel to the first and second sides of the wiring substrate 2 , respectively.
- FIGS. 3a-1 , 3 b- 1 , 3 a- 2 , 3 b- 2 , 3 a- 3 , 3 b- 3 , 3 c, 3 d, and 3 e a manufacturing method of semiconductor devices each according to the first embodiment will be described.
- a wiring base substrate for use in manufacturing the semiconductor devices each according to the first embodiment is a substrate made of a glass epoxy material and has a plurality of product forming regions.
- the product forming regions are arranged in a matrix and dicing lines are formed between the respective product forming regions.
- Each product forming region defined by the dicing lines will serve as a wiring substrate 2 of each semiconductor device.
- Each product forming region has the same structure as that of the wiring substrate 2 of the semiconductor device illustrated in FIGS. 1 and 2 , wherein a plurality of connection pads 3 are formed along a portion, where a semiconductor chip 6 will be mounted, on one surface side of the product forming region and a plurality of lands 4 are formed so as to be arranged in a grid pattern on the other surface side thereof.
- connection pads 3 and the corresponding lands 4 are electrically connected together by wiring patterns.
- the lands 4 are disposed so that bumps made of, for example, solder balls can be formed on predetermined positions in a later ball mounting process. That is, there is prepared the wiring base substrate having a large number of the product forming regions each formed with the connection pads 3 and the lands 4 .
- the wiring base substrate is subjected to a die bonding process where, as shown in FIG. 3a-1 , a semiconductor chip 6 is mounted at a central portion of each product forming region.
- the semiconductor chip 6 is fixed on each product forming region through, for example, an insulating adhesive DAF (die attach film) 7 using a non-illustrated die bonding apparatus.
- DAF die attach film
- the wiring base substrate having been subjected to the die bonding process is subjected to a wire bonding process where, as shown in FIG. 3b-1 , electrode pads 8 of the semiconductor chips 6 and the corresponding connection pads 3 of the wiring base substrate are electrically connected together through conductive wires 9 made of, for example, Au, respectively.
- the wire bonding is performed in the following manner. That is, using a non-illustrated wire bonding apparatus, a wire melted and formed with a ball at its tip is bonded to the electrode pad 8 by ultrasonic thermocompression bonding, then, while describing a predetermined loop, a rear end of the wire is bonded to the corresponding connection pad 3 by ultrasonic thermocompression bonding, thereby achieving electrical connection between the pads. All the electrode pads 8 and the connection pads 3 are electrically connected together by the wires 9 , respectively.
- the die bonding process and the wire bonding process are carried out a plurality of times so as to dispose a predetermined number of chips 6 at predetermined positions and to establish wire connection between electrode pads 8 on the predetermined chip 6 and corresponding electrode pads 8 on the predetermined chip 6 or corresponding connection pads 3 on the wiring base substrate in each product forming region.
- the die bonding and the wire bonding are repeated in order of FIGS. 3a-2 , 3 b- 2 , 3 a- 3 , and 3 b- 3 after FIGS. 3a-1 and 3 b- 1 .
- the die bonding process may be performed in advance for all necessary chips to thereby complete the die bonding process and then the wire bonding process may be performed collectively.
- this manufacturing method it is possible to prevent the occurrence of manufacturing failure of damaging wire-bonded wires by the die bonding operation for second or subsequent chips and to shorten the apparatus setting time by continuously performing the die bonding operation and continuously performing the wire bonding operation.
- the wiring base substrate having been subjected to the die bonding and the wire bonding is subjected to a molding process.
- a molten sealing resin such as, for example, a molten thermosetting epoxy resin is filled into a cavity between the upper and lower dies and then is heat-cured, thereby forming a sealing portion collectively covering all the product forming regions as shown in FIG. 3c .
- a sealing body 10 can be formed efficiently.
- the wiring base substrate formed with the sealing portion is subjected to a ball mounting process.
- external terminals are formed by mounting solder balls 5 on the lands 4 arranged on the other surface side of the wiring base substrate as shown in FIG. 3d .
- the solder balls 5 are vacuum-sucked and then mounted on the lands 4 of the wiring base substrate through flux. Thereafter, by applying reflow to the wiring base substrate, the solder balls 5 are fixedly joined to the lands 4 so that the bumps 5 are formed.
- the wiring base substrate formed with the bumps 5 is subjected to a substrate dicing process.
- the sealing portion is fixedly bonded to a dicing tape 23 and then the wiring base substrate is ground along the dicing lines by a dicing blade 22 rotating at high speed, thereby cutting and separating the wiring base substrate into pieces corresponding to the respective product forming regions.
- semiconductor devices each as shown in FIGS. 1 and 2 .
- FIG. 4 is a sectional view of a semiconductor device according to a second embodiment of this invention and FIG. 5 is a plan view of the semiconductor device of FIG. 4 as seen from below.
- the number of lands 4 and bumps 5 on the terminal surface side of a wiring substrate 2 is largely reduced as compared with an actual number thereof, thereby providing a schematic illustration.
- the bumps are arranged in a matrix with eight bumps in the vertical direction ( FIG. 5 ) and eight bumps in the horizontal direction ( FIG. 5 ).
- the bump arrangement in its entirety is shifted by one pitch or more of the bump arrangement from the center of the semiconductor device in the same direction as the chip shift direction. Since the number of the bumps increases at a portion where the stress concentrates due to the chip shift, the stress can be dispersed and relaxed and, therefore, it is possible to improve the lifetime of the outermost bump array 5 - 1 and thus to improve the lifetime of the semiconductor device.
- FIG. 6 is a sectional view of a semiconductor device according to a third embodiment of this invention and FIG. 7 is a plan view of the semiconductor device of FIG. 6 as seen from below.
- the number of lands 4 and bumps 5 on the terminal surface side of a wiring substrate 2 is largely reduced as compared with an actual number thereof, thereby providing a schematic illustration.
- the bumps are arranged in a matrix with eight bumps in the vertical direction ( FIG. 7 ) and eight bumps in the horizontal direction ( FIG. 7 ).
- lands 4 - 1 each have a concave-convex shape, wherein the lands 4 - 1 correspond to a bump array 5 - 1 disposed at a position farthest from the center of the semiconductor device in a shift direction of a semiconductor chip 6 (by one pitch or more of the bump arrangement), i.e. at a portion where the stress concentrates most.
- This makes it possible to increase the bonding strength between the lands 4 - 1 and the bumps 5 - 1 and, therefore, it is possible to improve the lifetime of the outermost bump array 5 - 1 and thus to improve the lifetime of the semiconductor device.
- FIG. 8 is a sectional view of a semiconductor device according to a fourth embodiment of this invention and FIG. 9 is a plan view of the semiconductor device of FIG. 8 as seen from below.
- the number of lands 4 and bumps 5 on the terminal surface side of a wiring substrate 2 is largely reduced as compared with an actual number thereof, thereby providing a schematic illustration.
- the bumps are arranged in a matrix with eight bumps in the vertical direction ( FIG. 9 ) and eight bumps in the horizontal direction ( FIG. 9 ).
- lands 4 - 3 and bumps 5 - 3 are formed to be larger in size than the other lands and bumps. This makes it possible to increase the bonding strength between the lands 4 - 3 and the bumps 5 - 3 and the bonding strength between the bumps 5 - 3 and the mounting board side and, therefore, it is possible to improve the lifetime of the outermost bump array 5 - 1 and thus to improve the lifetime of the semiconductor device.
- the reinforcement is carried out only for the outermost bump array in the chip shift direction.
- the reinforcement may also be applied to the second bump array or the second and third bump arrays from the outermost bump array and, in this case, a further lifetime improving effect for a semiconductor device is expected.
- this invention relates to a reinforcing structure for a portion where the stress concentrates, the required area on a bump mounting surface of a wiring substrate may remain the same as that on a conventional product and only partial improvement is sufficient for embodying this invention. Therefore, new package development with significant changes such as a change in size is not required and thus it is possible to suppress the cost such as the development cost.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Geometry (AREA)
- Wire Bonding (AREA)
Abstract
Description
Claims (25)
Priority Applications (1)
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US14/278,877 USRE45932E1 (en) | 2008-03-06 | 2014-05-15 | Semiconductor device and method of manufacturing the same |
Applications Claiming Priority (4)
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JP2008056842A JP5538682B2 (en) | 2008-03-06 | 2008-03-06 | Semiconductor device and manufacturing method thereof |
JP2008-056842 | 2008-03-06 | ||
US12/379,916 US8178971B2 (en) | 2008-03-06 | 2009-03-04 | Semiconductor device and method of manufacturing the same |
US14/278,877 USRE45932E1 (en) | 2008-03-06 | 2014-05-15 | Semiconductor device and method of manufacturing the same |
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US12/379,916 Reissue US8178971B2 (en) | 2008-03-06 | 2009-03-04 | Semiconductor device and method of manufacturing the same |
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USRE45932E1 true USRE45932E1 (en) | 2016-03-15 |
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US12/379,916 Ceased US8178971B2 (en) | 2008-03-06 | 2009-03-04 | Semiconductor device and method of manufacturing the same |
US14/278,877 Active 2030-01-30 USRE45932E1 (en) | 2008-03-06 | 2014-05-15 | Semiconductor device and method of manufacturing the same |
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US12/379,916 Ceased US8178971B2 (en) | 2008-03-06 | 2009-03-04 | Semiconductor device and method of manufacturing the same |
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US (2) | US8178971B2 (en) |
JP (1) | JP5538682B2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2010245412A (en) * | 2009-04-09 | 2010-10-28 | Renesas Electronics Corp | Method of manufacturing semiconductor integrated circuit device |
KR20110124993A (en) * | 2010-05-12 | 2011-11-18 | 삼성전자주식회사 | Semiconductor chip and semiconductor package including the same and method of manufacturing the same |
JP5667381B2 (en) | 2010-06-01 | 2015-02-12 | ピーエスフォー ルクスコ エスエイアールエルPS4 Luxco S.a.r.l. | Semiconductor device and manufacturing method thereof |
JP6939982B2 (en) | 2018-03-20 | 2021-09-22 | 株式会社村田製作所 | High frequency module |
KR20200095253A (en) * | 2019-01-31 | 2020-08-10 | 에스케이하이닉스 주식회사 | semiconductor package having anchor structure |
KR20210158257A (en) | 2020-06-23 | 2021-12-30 | 삼성전자주식회사 | chip stacking semiconductor package for improving a package reliability |
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Also Published As
Publication number | Publication date |
---|---|
JP5538682B2 (en) | 2014-07-02 |
JP2009212474A (en) | 2009-09-17 |
US20090224403A1 (en) | 2009-09-10 |
US8178971B2 (en) | 2012-05-15 |
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