CN104425287A - 封装结构及制造方法 - Google Patents
封装结构及制造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004806 packaging method and process Methods 0.000 title abstract 4
- 239000000758 substrate Substances 0.000 claims abstract description 42
- 239000000853 adhesive Substances 0.000 claims abstract description 14
- 230000001070 adhesive effect Effects 0.000 claims abstract description 14
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 30
- 238000007747 plating Methods 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 229910000679 solder Inorganic materials 0.000 abstract description 7
- 238000002955 isolation Methods 0.000 abstract 6
- 238000003466 welding Methods 0.000 abstract 6
- 238000010586 diagram Methods 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- 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
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- H01L2224/13099—Material
- H01L2224/131—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
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- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
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Abstract
一种封装结构,包括基板、设于基板上的芯片、多个锡球、多个焊垫、封胶体及与焊垫一一对应的隔离柱。芯片通过锡球与焊垫电性连接,封胶体包覆于芯片。隔离柱自相应的焊垫的边缘朝向远离焊垫的方向延伸形成,锡球收容于隔离柱内,隔离柱用于防止相邻的两个锡球之间发生短路。本发明还揭示了一种封装结构制造方法。本发明提供的封装结构及制造方法,通过在焊垫周边设置隔离柱,将锡球收容于隔离柱内,解决了锡桥问题,缩小了产品尺寸。
Description
技术领域
本发明涉及一种封装结构及制造方法,尤其涉及一种倒装芯片的封装结构及制造方法。
背景技术
现有技术中,倒装芯片的封装结构是通过在基板上设计阻隔层来防止相邻的锡球之间发生锡桥现象。由于需要在基板上镀大量的阻隔层以及需要预焊,从而使得相邻焊垫之间的中心距离必须大于100um以使相邻焊垫之间预留相应的空间来设置阻隔层。因此,采用此种结构会增大基板的尺寸,制造成本高,且不利于封装结构的小型化的发展趋势。
发明内容
有鉴于此,需提供一种封装结构及制造方法,不但可以有效解决锡球与锡球之间的锡桥问题,而且可缩小封装产品的尺寸。
本发明提供的封装结构,包括基板、设于基板上的多个焊垫、多个锡球、芯片及封胶体。所述芯片通过所述锡球与所述焊垫电性连接,所述封胶体包覆所述芯片,所述封装结构还包括与所述焊垫一一对应的隔离柱,所述隔离柱自相应的焊垫的边缘朝向远离所述焊垫的方向延伸形成,所述锡球收容于所述隔离柱内,所述隔离柱用于防止相邻的所述两个锡球之间发生短路。
优选地,所述隔离柱的材质为铜。
优选地,每两个相邻的所述隔离柱之间部分重合。
优选地,每两个相邻的所述隔离柱之重合部分的厚度为40um。
优选地,所述隔离柱的厚度为40um。
优选地,每两个相邻的隔离柱之间的距离为40um。
本发明提供的封装结构制造方法,用于将倒装芯片封装于基板上,所述封装结构制造方法包括:
制作所述基板外层线路,所述外层线路包括多个焊垫,所述基板分为第一区域及与所述焊垫一一对应的第二区域,所述第二区域围绕所述焊垫设置;
在所述第一区域上覆盖干膜;
在所述第二区域上制作隔离柱,所述隔离柱自所述焊垫的边缘朝向远离所述焊垫的方向延伸;
移除所述干膜;
蚀刻掉所述基板上多余的电镀线;
将锡球收容于所述隔离柱内并与所述基板电性连接,将所述倒装芯片置放于所述锡球上;
采用封胶体包覆所述倒装芯片,使所述倒装芯片定位于所述基板上。
优选地,所述隔离柱采用电镀的方式形成。
优选地,在将锡球收容于所述隔离柱内并与所述基板电性连接的步骤之间还包括在所述基板表面设置保护膜。
优选地,所述保护膜通过电镀镍金的方式或采用有机保护膜的方式形成。
相较于现有技术,本发明的封装结构通过触刻或电镀的方式设置隔离柱,用以取代阻焊层的设计,且无需在基板上进行预焊锡,有效的缩短了焊垫与焊垫之间的距离,从而缩小了产品的尺寸。同时,锡球与锡球之间通过隔离柱隔开,可有效防止锡桥的现象发生。
附图说明
图1所示为本发明实施方式中封装结构截面示意图。
图2所示为本发明封装结构的制造方法的流程图。
图3所示为制造基板外层线路的示意图。
图4所示为在第一区域覆盖干膜的示意图。
图5所示为电镀隔离柱的示意图。
图6所示为在基板上电镀保护膜的示意图。
图7所示为放置倒装芯片的示意图。
图8所示为基板封装成型的示意图。
图9所示为本发明另一种实施方式中封装结构截面示意图。
主要元件符号说明
封装结构 100
基板 10
外层线路 11
干膜 12
隔离柱 20
保护膜 21
锡球 30
芯片 40
焊垫 50
封胶体 60
如下具体实施方式将结合上述附图进一步说明本发明。
具体实施方式
请参照图1,本发明提供的封装结构100,包括基板10、设于基板10上的多个焊垫50、多个锡球30、芯片40及封胶体60。所述芯片40通过所述锡球30与所述焊垫50电性连接,所述封胶体60包覆所述芯片40。所述封装结构100还包括与所述焊垫一一对应的隔离柱20,所述隔离柱20自相应的焊垫50的边缘朝向远离所述焊垫50的方向延伸形成。所述锡球30收容于所述隔离柱20内,所述隔离柱20用于防止相邻的所述两个锡球30之间发生短路。
由此可见,本发明提供的封装结构100,通过在焊垫50之周边设置隔离柱20,将锡球30收容于隔离柱20内使相邻的锡球之间被隔离,从而能够有效防止基板在封装过程中发生锡桥的现象,缩小了封装产品的尺寸。
进一步的,在本实施方式中,所述隔离柱20的材质为铜。由于铜具有良好的导电性和热传导性,通过在基板上增加隔离柱,可以提高封装产品的散热性能。在本发明的其他实施方式中,隔离柱20也可以为其他金属材质,例如铝。
本实施方式中,每两个相邻的隔离柱20之间是相互分离的,每两个相邻的所述隔离柱20之间的距离为40um。由此可见,相较于先前技术,基板上焊垫与焊垫之间的距离大大缩小,从而有效缩小了封装结构的尺寸,符合产品小型化的发展趋势。
在本发明的其他实施方式(请参照图9)中,每两个相邻的所述隔离柱20之间部分重合,每两个相邻的所述隔离柱20之重合部分的厚度为40um。由于每两个相邻的所述隔离柱20之间可以实现重叠,大大缩小了焊垫与焊垫之间的距离,从而减小了产品的尺寸。
本发明之封装结构制造方法用于将所述倒装芯片40封装于基板10上。所述封装结构制造方法包括如下步骤。
请同时参照图2及图3,在步骤S100,将所述基板10分为第一区域及与所述焊垫一一对应的第二区域,所述第二区域围绕所述焊垫50设置,在所述基板10的第二区域制作外层线路11,需要保留电镀线。
请同时参照图2及图4,在步骤S200,在第一区域上覆盖干膜12,以防止基板表面氧化。
请同时参照图2及图5,在步骤S300,在所述第二区域上制作隔离柱20,所述隔离柱20自所述焊垫50的边缘朝向远离所述焊垫50的方向延伸。本实施方式中,所述隔离柱20的材质为铜,所述隔离柱20的厚度为40um,所述隔离柱20采用电镀的方式形成。在本发明的其他实施方式中,隔离柱20也可以为其他金属材质,例如铝。
请参照图2,在步骤S400,移除所述干膜12,本实施方式中,所述干膜12采用化学药液蚀刻的方式移除。
请参照图2,在步骤S500,蚀刻掉多余的电镀线。
请同时参照图2及图6,在步骤S600,在所述隔离柱20及焊垫50表面设置保护膜21,以对基板10的表面进行保护。所述保护膜21通过电镀镍金的方式或采用有机保护膜的方式形成,所述有机保护膜经过高温后会熔化,保证了焊垫50的导电性。
请同时参照图2及图7,在步骤S700,将锡球30收容于所述隔离柱20与所述焊垫50形成的凹槽内并通过所述焊垫50与电路板电性连接,将所述倒装芯片40置放于所述锡球30上。
请同时参照图2及图8,在步骤S800,采用封胶体60包覆所述倒装芯片40,使所述倒装芯片40定位于所述基板10上。
本实施方式中,采用注胶成型的技术将封胶体60包覆所述倒装芯片40,使所述倒装芯片40定位于所述基板10上。
本发明提供的封装结构制造方法利用倒装芯片的技术将倒装芯片40内埋于封胶体60内,通过采用电镀的方式设置隔离柱20,将锡球置放于隔离柱内以防止锡桥的现象发生,且相邻隔离柱之间的尺寸可根据需要进行相应调整,将隔离柱重叠可以缩短焊垫之间的距离,缩小封装产品的尺寸,适用于高密度倒装芯片的封装。
Claims (10)
1.一种封装结构,包括基板、设于基板上的多个焊垫、多个锡球、芯片及封胶体,所述芯片通过所述锡球与所述焊垫电性连接,所述封胶体包覆所述芯片,其特征在于,所述封装结构还包括与所述焊垫一一对应的隔离柱,所述隔离柱自相应的焊垫的边缘朝向远离所述焊垫的方向延伸形成,所述锡球收容于所述隔离柱内,所述隔离柱用于防止相邻的所述两个锡球之间发生短路。
2.如权利要求1所述的封装结构,其特征在于,所述隔离柱的材质为铜。
3.如权利要求1所述的封装结构,其特征在于,每两个相邻的所述隔离柱之间部分重合。
4.如权利要求3所述的封装结构,其特征在于,每两个相邻的所述隔离柱之重合部分的厚度为40um。
5.如权利要求1所述的封装结构,其特征在于,每一个隔离柱的厚度为40um。
6.如权利要求1所述的封装结构,其特征在于,每两个相邻的所述隔离柱之间的距离为40um。
7.一种封装结构制造方法,用于将倒装芯片封装于基板上,其特征在于,所述封装结构制造方法包括:
制作所述基板外层线路,所述外层线路包括多个焊垫,所述基板分为第一区域及与所述焊垫一一对应的第二区域,所述第二区域围绕所述焊垫设置;
在所述第一区域上覆盖干膜;
在所述第二区域上制作隔离柱,所述隔离柱自所述焊垫的边缘朝向远离所述焊垫的方向延伸;
移除所述干膜;
蚀刻所述基板上多余的电镀线;
将锡球收容于所述隔离柱内并与所述基板电性连接,将所述倒装芯片置放于所述锡球上;
采用封胶体包覆所述倒装芯片,使所述倒装芯片定位于所述基板上。
8.如权利要求7所述的封装结构制造方法,其特征在于,所述隔离柱采用电镀的方式形成。
9.如权利要求7所述的封装结构制造方法,其特征在于,在将锡球收容于所述隔离柱内并与所述基板电性连接的步骤之间还包括在所述基板表面设置保护膜。
10.如权利要求9所述的封装结构制造方法,其特征在于,所述保护膜通过电镀镍金的方式或采用有机保护膜的方式形成。
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CN105355573B (zh) * | 2015-11-04 | 2017-11-21 | 苏州启微芯电子科技有限公司 | Ccga自动植柱机 |
US10186478B2 (en) * | 2016-12-30 | 2019-01-22 | Texas Instruments Incorporated | Packaged semiconductor device with a particle roughened surface |
US11437333B2 (en) * | 2016-12-30 | 2022-09-06 | Texas Instruments Incorporated | Packaged semiconductor device with a reflow wall |
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