CN100353538C - 带有倒焊晶片的无引线半导体封装结构及制造方法 - Google Patents

带有倒焊晶片的无引线半导体封装结构及制造方法 Download PDF

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CN100353538C
CN100353538C CNB031785565A CN03178556A CN100353538C CN 100353538 C CN100353538 C CN 100353538C CN B031785565 A CNB031785565 A CN B031785565A CN 03178556 A CN03178556 A CN 03178556A CN 100353538 C CN100353538 C CN 100353538C
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陈锦辉
罗曼·佩雷斯
刘奇光
阿历克斯·周
安东尼奥·迪玛诺
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Abstract

公开了一种半导体芯片封装结构。此结构包括与隐藏式引线框互连的半导体芯片,所产生的组件封装在制模化合物中。最终的产品是无引线的四边扁平封装结构的倒置安装的半导体芯片。第二实施例允许半导体芯片的背面暴露出以增强散热。还说明了用于所公开的两个实施例的制造方法。

Description

带有倒焊晶片的无引线半导体封装结构及制造方法
技术领域
本发明总体上涉及半导体装置、集成电路或混合晶片的封装,更具体地说,本发明涉及具有很高空间效率的封装结构的半导体封装,同时还公开了制造这些封装的若干方法。
背景技术
以下三个美国专利与半导体芯片的封装结构有关。
1997年2月18日授权给W.R.Hamburgen等人的美国专利No.5,604,376显示了模制半导体芯片的引线结合在引线框上,而芯片的背面露出以增强散热。
1998年7月7日授予W.R.Hamburgen等人的美国专利No.5,776,800介绍了用于制备模制半导体封装的方法,其中半导体芯片用引线结合(邦定)在引线框上并进行模制,同时芯片的背面被露出。
1999年11月16日授予S.G.Lee的题为“具有轻便、简单和紧凑结构的半导体封装”的美国专利No.5,986,334,描述了四种用于使半导体芯片与带有用于增强散热的倒装晶片结构的引线框互连的结构。
随着半导体领域中的超大规模集成电路VLSI技术的发展以及将此项技术应用到要求节省空间的元件的产品和系统上,对具有紧凑结构的半导体芯片封装的需要也开始占主导地位。
半导体芯片封装,或一级的封装,需要为各应用提出以下要求:
●提供所需数量的连到半导体芯片的电信号互连。
●提供所需数量的连到半导体芯片上的电源互连。
●具有必要的布线结构,其用于使信号和电源线互连到芯片上,并从芯片互连到下一级别的封装,即典型地为印刷电路板上。
●提供可消除由半导体芯片电路所产生的热能的手段。
●提供可进行机械支撑并保护芯片免受环境污染物污染的结构。
各种一级封装结构已能满足这些要求。陶瓷和塑料材料被用作基本结构,并带有用于互连的金属引线框和/或引线接合(wire bonding)。引线接合到芯片端上,已成为与芯片端子互连的主要方法。采用铜、金或焊块的倒装晶片结构也已经用于与芯片端子互连。
如图1(现有技术)所示的最初的双列直插式DIP封装同时采用陶瓷和塑料结构,而在背面接合的半导体芯片引线接合到引线框上。此设计的主要缺点是采用封装的两侧来进行互连,并且在下一级别的封装中使用了要求有镀通孔的引线。此封装结构在节省空间方面是非常低效的,导致了较高的时间延迟并对系统性能造成负面影响。
同样要求有镀通孔的半导体封装是如图2(现有技术)所示的针栅阵列PGA封装。PGA封装主要采用陶瓷主体,其内部金属结构使芯片端子与外部引脚相连。接合引线和倒装晶片焊接芯片被用于芯片互连。PGA封装的主要优点是,由于它是天线阵列互连结构,因此高效率地利用了互连区域。
随着表面组装技术SMT的来临,一级封装到印刷电路插件或板上的互连不需要镀通孔,从而使采用用于如图3(现有技术)所示的互连引线的封装的整个周边的封装得到发展。如图3(现有技术)示出的四边扁平封装QFP结构同时采用陶瓷和塑料主体结构以及引线接合或倒装晶片以安装和互连半导体芯片。表面组装和用于互连的封装四边的使用使空间利用及电性能得到增强。
为了进一步增强空间利用及改善电性能,封装的外部引线被包含在陶瓷或塑料的主体结构中。无引线的芯片外壳LCC的陶瓷型式如图4(现有技术)所示。LCC结构具有增强的空间特性和电性能。该结构缺乏以增强散热的方式与半导体芯片接触的能力。此外,陶瓷主体要求提供气密式金属密封以便为半导体芯片提供环境保护。陶瓷LCC的制造方法复杂,造成产品成本高。
发明内容
因此,本发明的一个或多个实施例的一个目的是为半导体芯片提供一级封装,其具有外包、机械支撑和互连半导体芯片信号及电源端子到可从外部接近以与下一级封装互连的端子上。
本发明的一个或多个实施例的另一目的是具有提供额外的增强散热的能力,这是通过与用于需要增强散热的应用场合即热沉的芯片的背面接触而实现的。
本发明的另一目的是所形成的封装结构具有紧凑的结构,可增加空间利用率以及提供系统水平级的更好的系统性能。
封装结构还应具有使半导体芯片互连的能力,这些半导体芯片已经设计有引线接合的互连,而不需要重新设计半导体芯片或封装布线。
本发明的另一目的是提供用于制造半导体封装的方法,简单、经济高效并提供合格产品。
本发明上述目的这样实现,提供带有全密封的倒装晶片的半导体芯片封装结构的结构和制造方法,以及提供作为第二实施例的带有露出的倒装晶片背面的半导体芯片封装的结构和制造方法。
本发明的一个实施例如图5A、5B所示。图5A是封装结构的剖视图,其中半导体芯片10是接合到隐藏式引线框14上的倒焊晶片。半导体芯片及引线框组件被封装在模制化合物16内。引线框14具有用于互连到如图5B所示的下一级封装上的外露触点。
本发明的另一实施例如图6A、6B所示。半导体芯片10是接合到隐藏式引线框14上的倒焊晶片。半导体芯片和引线框组件密封在模塑料16中。此实施例允许半导体芯片10的背面外露以用于增强散热。这是通过制备过程中的不同方法来实现的。
本发明的一个或多个实施例的优点包括一种半导体芯片封装结构,其空间可高度节省,可提供改进的电性能,可增强散热,可用于封装不同尺寸的半导体芯片,是一种在封装先前已进行引线接合的半导体芯片时的显而易见的结构。这种结构的制造方法简单而经济有效。
附图说明
通过以下介绍并结合附图,可以更清楚地理解本发明。在附图中,类似的标号表示类似的或对应的部件、区域和部分。在附图中:
图1是现有技术的传统的DIP模块。
图2是现有技术的传统的PGA模块。
图3是现有技术的传统的QFP模块。
图4是现有技术的传统的LCC模块。
图5A是本发明的倒焊晶片封装的第一优选实施例的剖视图。
图5B是本发明的倒焊晶片封装的第一优选实施例的底视图。
图6A是本发明的倒焊晶片封装的第二优选实施例的剖视图。
图6B是本发明的倒焊晶片封装的第二优选实施例的底视图。
图7示出了使半导体芯片连接到本发明的第一优选实施例的隐藏式引线框上的方法。
图8示出了本发明的第一优选实施例的半导体芯片和引线框组件的模制。
图9示出了本发明的第一优选实施例的研磨过程。
图10示出了使使半导体芯片连接到本发明的第二优选实施例的隐藏式引线框上的方法。
图11示出了本发明的第二优选实施例的半导体芯片和引线框组件的模制。
图12示出了本发明的第二优选实施例的研磨过程。
图13示出了制造本发明的第二优选实施例的另一方法。
具体实施方式
VLSI半导体芯片在电子商品例如相机、可携式摄象机、DVD播放机等上面的应用,要求半导体封装在设计上要高度节省空间。另外,军事领域的应用要求重量轻、节省空间的封装结构。
为了满足这些要求,已经开发出半导体封装结构可以提供对输入-输出的互连不断增长的要求,半导体芯片的高热度下的使用,同时保护半导体芯片免受环境影响。这些封装结构同时采用陶瓷和塑料材料作为封装的主体结构,并采用引线接合、焊块和引线框来使半导体芯片输入-输出和电源端子与外部接头相连。
本发明公开了一种半导体封装结构及制造方法,其采用了带有与隐藏式引线框相连的输入-输出和电源端子的半导体芯片,并且组件封装在塑料化合物中。
本发明如图5A和5B所示。包括有用于互连结构12的焊块、焊点或铜触点的半导体芯片10被连接到隐藏式引线框14上,并封装在塑胶化合物16中。以可允许引线框14的外部引线可接近以便互连到下一级的方式对封装物进行模制。
本发明的第二实施例如图6A和6B所示。包括有用于互连结构12的焊块、焊点或铜触点的半导体芯片10被连接到隐藏式引线框14上,并封装在塑胶化合物16中。以允许引线框14的外部引线可接近以便互连到下一级的方式对封装物进行模制。本发明的此实施例还允许半导体芯片的背面是可接近的,以提供额外的增强散热。
公开于本发明的第一和第二实施例中的半导体芯片封装的倒焊芯片结构满足了电子系统对节省空间的半导体封装的要求。此外,紧凑的结构还提供了增强的电性能例如低的信号飞行时间。倒焊芯片封装结构还允许利用专为使用引线接合封装的半导体芯片而无需重新设计半导体芯片的信号和电源走线。所公开的封装结构可通过改变引线框中的凹入处的深度而用于不同厚度的半导体芯片中。此特征使得整个封装结构的厚度小于1毫米。
本发明的以及本文中所公开的倒焊晶片半导体封装的制造方法包括以下步骤:
在本发明的第一实施例中,倒焊晶片半导体如图5A所示进行完全封装。带有隐藏式内引线的导电性金属引线框17,如图7,被金属接合到凸起的半导体芯片10上。组件模制在塑胶化合物16中,如图8所示。在制模化合物固化后,采用研磨工序从引线框14的外部引线上除去制模化合物,如图9。
在本发明的第二实施例中,如图6A所示的倒焊晶片式半导体芯片以与完全封装的实施例相类似的形式进行加工,但图10和图11中的引线框14具有比较浅的凹入处,并且允许半导体芯片10的背面在研磨工序中被露出,如图12所示。
用于获得如本发明的第二实施例所述结构的另一方法是在模制工序(如图13)中采用薄膜20,其限制制模化合物覆盖住半导体芯片的背面和引线框的外触点。
虽然已经参考本发明的示例性特定实施例来介绍和显示了本发明,但本发明并不限于这些示例性实施例。本领域的技术人员可以理解,在不偏离本发明的实质的前提下可进行各种变动和修改。因此,在所附权利要求及其等效者的范围内的所有这些变动和修改都包含在本发明内。

Claims (17)

1.一种半导体芯片封装结构,其特征在于,包括:
倒置安装的半导体芯片;
互连到所述半导体芯片的输入-输出和电源端子上的隐藏式导电性金属合金引线框;
完全包围所述半导体芯片和所述引线框的模制的封装物;
以及用于所述隐藏式导电性金属合金引线框的,用于外部互连结构的可焊接引线。
2.根据权利要求1所述的半导体芯片封装结构,其特征在于,所述引线框包括铜Cu合金。
3.根据权利要求1所述的半导体封装结构,其特征在于,所述半导体芯片的互连结构包括成形为焊球或柱的焊料合金。
4.根据权利要求1所述的半导体芯片封装结构,其特征在于,所述半导体芯片与半导体芯片互连结构包括铜Cu或金属的柱。
5.根据权利要求1所述的半导体封装结构,其特征在于,所述引线框以可变的深度凹入到芯片互连区域中。
6.根据权利要求1所述的半导体芯片封装结构,其特征在于,所述结构的整个厚度小于1毫米。
7.根据权利要求1所述的半导体芯片封装结构,其特征在于,所用的半导体芯片设计成引线接合的应用场合。
8.一种半导体芯片封装结构,包括:
倒置安装的半导体芯片;
互连到所述半导体芯片的输入-输出和电源端子上的隐藏式导电性金属合金引线框;
包围所述半导体芯片和所述引线框组件的模制的封装物;
其中所述半导体芯片的背面以及外部的输入-输出和电源引线是暴露的。
9.根据权利要求8所述的半导体芯片封装结构,其特征在于,所述引线框是铜Cu合金。
10.根据权利要求8所述的半导体芯片封装结构,其特征在于,所述半导体芯片的互连结构包括成形为焊球或柱的焊料合金。
11.根据权利要求8所述的半导体芯片封装结构,其特征在于,所述半导体芯片与半导体芯片互连结构包括铜Cu或金属柱。
12.根据权利要求8所述的半导体芯片封装结构,其特征在于,所述引线框以可变的深度凹入到芯片互连区域中。
13.根据权利要求8所述的半导体芯片封装结构,其特征在于,所述结构的整个厚度小于1毫米。
14.根据权利要求8所述的半导体芯片封装结构,其特征在于,所用的半导体芯片设计成可用于引线接合的应用场合。
15.一种产生倒置安装的半导体芯片封装的方法,其特征在于,包括步骤:
提供隐藏式引线框;
使半导体芯片与所述隐藏式引线框互连;
完全封装所述芯片和隐藏式引线框以形成引线框组件;
研磨所述引线框组件以暴露出外部引线框输入-输出和电源触点;
以及电焊式涂镀所暴露的所述外部引线框输入-输出和电源触点。
16.一种产生倒置安装的半导体芯片封装的方法,其特征在于,包括以下步骤:
提供隐藏式引线框;
使半导体芯片与所述隐藏式引线框互连;
完全封装所述芯片和隐藏式引线框以形成引线框组件;
研磨所述引线框组件以暴露出所述半导体芯片的背面和所述引线框的外部触点;
以及电焊式涂镀所暴露的引线框触点。
17.根据权利要求16所述的方法,其特征在于,将塑料薄膜用于所述模制工序中,以允许所述半导体芯片的背面和所述引线框的外部触点得以暴露。
CNB031785565A 2002-12-09 2003-07-15 带有倒焊晶片的无引线半导体封装结构及制造方法 Ceased CN100353538C (zh)

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