The embodiments discussed herein are related to a semiconductor component in which a semiconductor element is enclosed, and a manufacturing method of the semiconductor component.
Recently, in semiconductor packages in which a semiconductor element is enclosed, the heat generation rate has been increasing as the operation frequency and the wiring density of the semiconductor element increase and the density of wiring increases, and there is a need to securely dissipate the generated heat and to effectively reduce the thermal resistance. Moreover, as a semiconductor package which is superior in the convenience of additional installation, version upgrading, and maintenance etc. of electronic equipment after it is brought into operation, semiconductor packages of an LGA (Land Grid Array) structure in which thin plate-shaped electrodes are arranged in a grid-like pattern on the surface are widely used.
The semiconductor package 10 includes a wiring board 11 in the lower face of which thin plate-shaped electrodes are disposed, a semiconductor element 12 to which I/O terminals 14 are attached, a heat spreader 17 which dissipates heat generated in the semiconductor element 12, a spacer 16 which supports the heat spreader 17, where the semiconductor element 12 and the heat spreader 17 are joined by a joining member 13, and the spacer 16, the wiring board 11, and the heat spreader 17 are bonded by an adhesive 15. In order to reduce the thermal resistivity of the semiconductor element 12, it is necessary to effectively transfer heat generated at the semiconductor element 12 to the heat spreader 17, and therefore the thickness of the joining member 13 for joining the semiconductor element 12 with the heat spreader 17 is precisely adjusted.
The semiconductor package 10, in which the wiring board 11 is displaced so as to face a socket with pins arranged in a grid-like pattern, is mounted into electronic equipment by being strongly pressed against the socket. Thus, a semiconductor package 10 of LGA structure has an advantage in that it may be attached to and detached from electronic equipment more easily and may be powered more efficiently compared with semiconductor packages including raised electrodes made up of pins and solder etc.
Incidentally, in a semiconductor package 10 of LGA structure, the registration with the socket is performed by the outer dimensions, and the semiconductor package 10 is mounted into electronic equipment by being strongly pressed against the socket. For this reason, if the wiring board 11, the heat spreader 17, and others are obliquely bonded due to the squeeze-out of the adhesive 15 or any other factor, the pressing force F from the socket will be applied leaning toward one part of the surface of the wiring board 11 posing risks of such as fracture of the wiring board 11 and breakage of the internal wiring. Further, if the adhesive 15 is squeezed out beyond the outer dimension of the semiconductor package 10, misregistrations between the semiconductor package 10 and the socket may take place resulting in connection deficiencies.
In this respect, Japanese Laid-open Patent Publications No. 2006-80297 and No. 2004-296739 describe a technique in which there is provided a step in the end face of the spacer so that the squeezed-out adhesive is accommodated therein. According to the technique described by Japanese Laid-open Patent Publications No. 2006-80297 and No. 2004-296739, since an excess adhesive will be pressed out to the end face of the spacer entering into the step, it is possible to mitigate the squeeze-out of the adhesive.
However, since the semiconductor package 10 itself is small-sized, a problem remains in that the amount of adhesive which may be accommodated in the step in the spacer end face is very small and is not enough to solve the fracture of the wiring board and the connection deficiencies due to the squeeze-out of the adhesive.
According to an aspect of the invention, a semiconductor component includes a semiconductor element that has a plurality of signals, a wiring board that is disposed below the semiconductor element and that draws the plurality of signals of the semiconductor element, a heat conduction member that dissipates heat generated by the semiconductor element, a joining member that is disposed between the semiconductor element and the heat conduction member and that joins the heat conduction member to the semiconductor element, a support member formed with an opening so as to surround the semiconductor element that supports the heat conduction member, a first adhesive member that is disposed between the support member and the wiring board to bond the support member with the wiring board and a second adhesive member that is disposed between the support member and the heat conduction member to bond the support member with the heat conduction member.
Hereafter, embodiments of the present invention will be described with reference to appended drawings.
The semiconductor component 100 is formed such that on a wiring board 110, there are placed a joining member 123, an adhesive sheet 130, a spacer 140, and a heat spreader 150 etc. on top of one another.
There are thin plate-shaped electrodes disposed in the lower face of the wiring board 110, which exchanges signals and power with external apparatuses as the result of those electrodes being pressed against a socket. The wiring board 110 corresponds to an example of the wiring board referred to in the present embodiment.
There is disposed a semiconductor element beneath the joining member 123, and the semiconductor element and the heat spreader 150 are bonded by the joining member 123. The semiconductor element and the joining member 123 will be illustrated below. Moreover, the adhesive sheet 130 and the spacer 140 are provided with openings 131 and 142 respectively, and the semiconductor element and the joining member 123 are disposed inside those openings 131 and 142.
The adhesive sheet 130 is made up of a thermosetting adhesive material and two sheets thereof are provided interposing the spacer 140 therebetween. The adhesive sheet 130 disposed between the wiring board 110 and the spacer 140 is an example of the first adhesive member referred to in the present embodiment and also corresponds to an example of the first thermosetting adhesive member referred to in the present embodiment. Further, the adhesive sheet 130 disposed between the spacer 140 and the heat spreader 150 is an example of the second adhesive member referred to in the present embodiment and also corresponds to an example of the second thermosetting adhesive member referred to in the present embodiment.
The spacer 140, which is adapted to support the heat spreader 150, is formed with grooves 141 having the same length with one another in the outer peripheral section of each of the upper and lower faces as illustrated in
Now, description will return to
The heat spreader 150 is adapted to dissipate heat generated by the semiconductor element disposed beneath the joining member 123. The heat spreader 150 corresponds to an example of the heat conduction member referred to in the present embodiment.
The heat spreader 150 is formed, from outward appearances, such that a spacer 140 etc. is interposed between the wiring board 110 and the heat spreader 150 and, in the space formed by the wiring board 110, the heat spreader 150, and spacer 140, the semiconductor element and the joining member 123 are enclosed.
Next, a manufacturing method of the semiconductor component 100 will be described.
Upon manufacturing the semiconductor component 100, first, a first adhesive sheet 130, a spacer 140, and a second adhesive sheet 130 are disposed in this order on a wiring board 110, and a semiconductor element 122, to which an I/O terminal 121 is bonded by a adhesive material 121a, and a joining member 123 are successively disposed inside each of the openings 131 and 142 of the adhesive sheet 130 and the spacer 140 (step S11 of
It is noted that in the present embodiment, an adhesive sheet 130 having a thickness larger than conventionally used is applied so that the thickness of the two adhesive sheets 130 interposing the spacer 140 therebetween is larger than the thickness of the semiconductor element 122 with the joining member 123 placed thereon.
Then, a heat spreader 150 is overlaid on the joining member 123 and the adhesive sheet 130 to form a semiconductor component 100 in the state before various elements are bonded thereto (hereafter, the semiconductor component 100 before the bonding process is referred to as an “unbonded semiconductor component 100′”). In step S12—a of
When the heat spreader 150 is overlaid and the unbonded semiconductor component 100′ is heated, the surface of the joining member 123 melts thereby increasing the viscosity, and two adhesive sheets 130 melt into a liquid. Further, the heat spreader 150 is pressed against the joining member 123 (step S13 of
Next, the unbonded semiconductor component 100′ is cooled down (step S14 of
The hardened thermosetting adhesive material 132′ is present between the spacer 140 and the heat spreader 150 and between the spacer 140 and the wiring board 110 thereby bonding them, and an excess part thereof has gotten into the grooves 141 of the spacer 140. Thus, since the semiconductor component 100, in which no squeeze-out of the thermosetting adhesive material 132 has occurred, has a uniform thickness, it is possible to avoid deficiencies such as that the wiring board 110 fractures by being pressed hard against the socket, and misregistration with the socket, which is registered by the outer dimension, takes place leading to connection deficiencies. Further, since as a result of a rather thick adhesive sheet 130 being used, the clearances between the spacer 140 and the wiring board 110, and between the spacer and the heat spreader 150 are filled with an excess thermosetting adhesive material 132, it becomes possible to omit the process of charging and hardening liquid resin such as underfill materials into clearances, which is conventionally carried out in a later stage of step S14, thus reducing the manufacturing cost.
So far, the description of the first embodiment of the present invention has been completed, and a second embodiment thereof will be described. Since the second embodiment of the present invention has a similar structure as the first embodiment excepting the shape of the grooves formed in the spacer, like elements as those of the first embodiment will be given like reference symbols to omit the description thereof and only the differences from the first embodiment will be described.
The spacer 140_2 of the present embodiment is formed, unlike the spacer 140 of the first embodiment illustrated in
So far, the description of the second embodiment of the present invention has been completed, and a third embodiment thereof will be described. Since the third embodiment of the present invention has a similar structure as the first embodiment excepting the shape of the grooves provided in the spacer, like elements as those of the first embodiment will be given like reference symbols to omit the description thereof and only the differences from the first embodiment will be described.
The spacer 140_3 of the present embodiment is formed such that the grooves 141 in a corner portion P are radially provided at an angle with one another so as to intersect at the inside of the opening 142. In the spacer 140_3 illustrated in
So far, the description of the third embodiment of the present invention has been completed, and a fourth embodiment thereof will be described. Since the third embodiment of the present invention also has a similar structure as the first embodiment excepting that cut-outs instead of the grooves are provided in the spacer, like elements as those of the first embodiment will be given like reference symbols to omit the description thereof and only the differences from the first embodiment will be described.
The spacer 160 of the present embodiment is, unlike the spacer 140 of the first embodiment illustrated in
Similarly to the manufacturing method of the semiconductor component 101 of the first embodiment illustrated in
Next, the heat spreader 150 is overlaid to form an unbonded semiconductor component 101′. In step S22—a of
Further, the unbonded semiconductor component 101′ is heated to melt the joining member 123 and the two adhesive sheets 130 (step S23 of
When the cut-outs 161 are filled with the thermosetting adhesive material 132, the unbonded semiconductor component 100′ is cooled down (step S24 of
So far, the description of the fourth embodiment of the present invention has been completed, and a fifth embodiment thereof will be described. Since the fifth embodiment of the present invention has a similar structure as the fourth embodiment of the present invention excepting the shape of the cut-outs provided in the spacer, like elements as those of the fourth embodiment will be given like reference symbols to omit the description thereof and only the differences from the fourth embodiment will be described.
The spacer 160_2 of the present embodiment is formed such that cut-outs 161 in a corner portion P are radially provided at an angle with one another so as to intersect at within the opening 162. Since in the spacer 160 of the present embodiment, the contact area with the adhesive sheet 130 is larger in the corner portions P than in other portions, it is possible to achieve both the maintenance of the bonding accuracy and the prevention of the squeeze-out of the thermosetting adhesive material.
So far, the description of the fifth embodiment of the present invention has been completed, and a sixth embodiment thereof will be described. Since the sixth embodiment of the present invention has a similar structure as the first embodiment of the present invention excepting the shapes of the spacer and the adhesive sheet, like elements as those of the first embodiment will be given like reference symbols to omit the description thereof and only the differences from the first embodiment will be described.
Similarly to the semiconductor component 100 of the first embodiment illustrated in
When the adhesive sheet 180 illustrated in
So far, the description of the sixth embodiment of the present invention has been completed, and a seventh embodiment thereof will be described. Since the seventh embodiment of the present invention has a similar structure as the sixth embodiment of the present invention excepting the shape of the cut-out of the adhesive sheet, only the differences from the sixth embodiment will be described.
The adhesive sheet 180_2 of the present embodiment is formed such that the length L1 of the cut-out 182 of a corner portion is less than the length L2 of the cut-out 182 of a middle side portion. Since, in the adhesive sheet 180_2 of the present embodiment, the contact area between the adhesive sheet 180_2 and the spacer 170 is larger in corner portions where spacer 170 is more susceptible to peeling off, it is possible to avoid the squeeze-out of the thermosetting adhesive material while maintaining the bonding accuracy of the spacer 170.
So far, the description of the seventh embodiment of the present invention has been completed, and an eighth embodiment thereof will be described. Since the eighth embodiment of the present invention has a similar structure as the sixth embodiment of the present invention excepting the shape of the cut-out of the adhesive sheet, only the differences from the sixth embodiment will be described.
Since the adhesive sheet 180_3 of the present embodiment is formed such that the cut-outs 182 in a corner portion are radially provided at an angle with one another so as to intersect within the opening 181, the contact area between the adhesive shut 180-3 and the space 170 becomes larger closer to the outer peripheral side where peeling off is more likely to take place. Thus, by providing radial cut-outs 182 in the corner portions P of the adhesive sheet 180_3, it is also possible to prevent the squeeze-out of the thermosetting adhesive material while maintaining the bonding accuracy of the spacer 170.
So far, the description of the eighth embodiment of the present invention has been completed, and a ninth embodiment thereof will be described. Since the ninth embodiment of the present invention has a similar structure as the sixth embodiment excepting the shape of the spacer, only the differences from the sixth embodiment will be described.
Similarly to the semiconductor component 200 of the sixth embodiment illustrated in
When the adhesive sheet 180 illustrated in
Here it is noted that although description has been made on the cases in which grooves are provided in both the upper and lower faces of the spacer, the support member according to the present invention may be one in which grooves are provided only in one face.
Further, although, in the above, description has been made on a case in which cut-outs are provided in each of the spacer and the adhesive sheet, the support member and the adhesive member according to the present invention may be formed such that cut-outs are provided in one of the members and grooves are provided in the other.
Although description has been made on the case in which grooves are provided only in the outer peripheral section of the spacer, the support member according to the present invention may be formed such that grooves are provided in the entire upper face.
As so far described, according to the present invention, it is possible to provide a semiconductor component in which the deficiencies due to the squeeze-out of the adhesive member are mitigated.
All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the invention. Although the embodiments of the present invention has been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.
This is a continuation application of PCT/JP2007/56389, filed on Mar. 27, 2007.
Number | Name | Date | Kind |
---|---|---|---|
2995686 | Selvin | Aug 1961 | A |
5424918 | Felps et al. | Jun 1995 | A |
5959353 | Tomita | Sep 1999 | A |
6232652 | Matsushima | May 2001 | B1 |
7173329 | Frutschy et al. | Feb 2007 | B2 |
Number | Date | Country |
---|---|---|
5-251980 | Sep 1993 | JP |
9-293808 | Nov 1997 | JP |
10-050877 | Feb 1998 | JP |
10-144737 | May 1998 | JP |
2000-106410 | Apr 2000 | JP |
2003-218253 | Jul 2003 | JP |
2004-296739 | Oct 2004 | JP |
2006-80297 | Mar 2006 | JP |
Number | Date | Country | |
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20100013089 A1 | Jan 2010 | US |
Number | Date | Country | |
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Parent | PCT/JP2007/056389 | Mar 2007 | US |
Child | 12585704 | US |